From 83df2c81d3338eec01e3387204511febed37a29f Mon Sep 17 00:00:00 2001
From: Mayur Kale <mayurkale@google.com>
Date: Tue, 8 Jan 2019 18:02:41 -0800
Subject: [PATCH 1/3] Add helper util for coverting OC Metrics data models to
 SD monitoring data models

---
 package-lock.json                             | 158 ++--
 packages/opencensus-core/package-lock.json    | 894 +++++++++++++-----
 .../src/stackdriver-stats-utils.ts            | 288 ++++++
 .../src/types.ts                              |   6 +-
 .../test/test-stackdriver-stats-utils.ts      | 433 +++++++++
 5 files changed, 1468 insertions(+), 311 deletions(-)
 create mode 100644 packages/opencensus-exporter-stackdriver/src/stackdriver-stats-utils.ts
 create mode 100644 packages/opencensus-exporter-stackdriver/test/test-stackdriver-stats-utils.ts

diff --git a/package-lock.json b/package-lock.json
index 826a27cee..6be65b72d 100644
--- a/package-lock.json
+++ b/package-lock.json
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diff --git a/packages/opencensus-core/package-lock.json b/packages/opencensus-core/package-lock.json
index d702e0ea2..f4ed3c19f 100644
--- a/packages/opencensus-core/package-lock.json
+++ b/packages/opencensus-core/package-lock.json
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@@ -1566,21 +1779,25 @@
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             "fs.realpath": "^1.0.0",
             "inflight": "^1.0.4",
@@ -1670,11 +1898,13 @@
         },
         "graceful-fs": {
           "version": "4.1.11",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "handlebars": {
           "version": "4.0.11",
           "bundled": true,
+          "dev": true,
           "requires": {
             "async": "^1.4.0",
             "optimist": "^0.6.1",
@@ -1685,6 +1915,7 @@
             "source-map": {
               "version": "0.4.4",
               "bundled": true,
+              "dev": true,
               "requires": {
                 "amdefine": ">=0.0.4"
               }
@@ -1693,19 +1924,23 @@
         },
         "has-flag": {
           "version": "3.0.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "hosted-git-info": {
           "version": "2.7.1",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "imurmurhash": {
           "version": "0.1.4",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "inflight": {
           "version": "1.0.6",
           "bundled": true,
+          "dev": true,
           "requires": {
             "once": "^1.3.0",
             "wrappy": "1"
@@ -1713,47 +1948,56 @@
         },
         "inherits": {
           "version": "2.0.3",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "invert-kv": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "is-arrayish": {
           "version": "0.2.1",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "is-buffer": {
           "version": "1.1.6",
           "bundled": true,
-          "optional": true
+          "dev": true
         },
         "is-builtin-module": {
           "version": "1.0.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "builtin-modules": "^1.0.0"
           }
         },
         "is-fullwidth-code-point": {
           "version": "2.0.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "is-stream": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "isexe": {
           "version": "2.0.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "istanbul-lib-coverage": {
           "version": "2.0.1",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "istanbul-lib-hook": {
           "version": "2.0.1",
           "bundled": true,
+          "dev": true,
           "requires": {
             "append-transform": "^1.0.0"
           }
@@ -1761,6 +2005,7 @@
         "istanbul-lib-report": {
           "version": "2.0.2",
           "bundled": true,
+          "dev": true,
           "requires": {
             "istanbul-lib-coverage": "^2.0.1",
             "make-dir": "^1.3.0",
@@ -1770,6 +2015,7 @@
         "istanbul-lib-source-maps": {
           "version": "2.0.1",
           "bundled": true,
+          "dev": true,
           "requires": {
             "debug": "^3.1.0",
             "istanbul-lib-coverage": "^2.0.1",
@@ -1780,25 +2026,28 @@
           "dependencies": {
             "source-map": {
               "version": "0.6.1",
-              "bundled": true
+              "bundled": true,
+              "dev": true
             }
           }
         },
         "istanbul-reports": {
           "version": "2.0.1",
           "bundled": true,
+          "dev": true,
           "requires": {
             "handlebars": "^4.0.11"
           }
         },
         "json-parse-better-errors": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "kind-of": {
           "version": "3.2.2",
           "bundled": true,
-          "optional": true,
+          "dev": true,
           "requires": {
             "is-buffer": "^1.1.5"
           }
@@ -1806,11 +2055,13 @@
         "lazy-cache": {
           "version": "1.0.4",
           "bundled": true,
+          "dev": true,
           "optional": true
         },
         "lcid": {
           "version": "1.0.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "invert-kv": "^1.0.0"
           }
@@ -1818,6 +2069,7 @@
         "load-json-file": {
           "version": "4.0.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "graceful-fs": "^4.1.2",
             "parse-json": "^4.0.0",
@@ -1828,6 +2080,7 @@
         "locate-path": {
           "version": "3.0.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "p-locate": "^3.0.0",
             "path-exists": "^3.0.0"
@@ -1835,16 +2088,18 @@
         },
         "lodash.flattendeep": {
           "version": "4.4.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "longest": {
           "version": "1.0.1",
           "bundled": true,
-          "optional": true
+          "dev": true
         },
         "lru-cache": {
           "version": "4.1.3",
           "bundled": true,
+          "dev": true,
           "requires": {
             "pseudomap": "^1.0.2",
             "yallist": "^2.1.2"
@@ -1853,6 +2108,7 @@
         "make-dir": {
           "version": "1.3.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "pify": "^3.0.0"
           }
@@ -1860,17 +2116,20 @@
         "md5-hex": {
           "version": "2.0.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "md5-o-matic": "^0.1.1"
           }
         },
         "md5-o-matic": {
           "version": "0.1.1",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "mem": {
           "version": "1.1.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "mimic-fn": "^1.0.0"
           }
@@ -1878,51 +2137,60 @@
         "merge-source-map": {
           "version": "1.1.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "source-map": "^0.6.1"
           },
           "dependencies": {
             "source-map": {
               "version": "0.6.1",
-              "bundled": true
+              "bundled": true,
+              "dev": true
             }
           }
         },
         "mimic-fn": {
           "version": "1.2.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "minimatch": {
           "version": "3.0.4",
           "bundled": true,
+          "dev": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
         },
         "minimist": {
           "version": "0.0.10",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "mkdirp": {
           "version": "0.5.1",
           "bundled": true,
+          "dev": true,
           "requires": {
             "minimist": "0.0.8"
           },
           "dependencies": {
             "minimist": {
               "version": "0.0.8",
-              "bundled": true
+              "bundled": true,
+              "dev": true
             }
           }
         },
         "ms": {
           "version": "2.0.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "normalize-package-data": {
           "version": "2.4.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "hosted-git-info": "^2.1.4",
             "is-builtin-module": "^1.0.0",
@@ -1933,17 +2201,20 @@
         "npm-run-path": {
           "version": "2.0.2",
           "bundled": true,
+          "dev": true,
           "requires": {
             "path-key": "^2.0.0"
           }
         },
         "number-is-nan": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "once": {
           "version": "1.4.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "wrappy": "1"
           }
@@ -1951,6 +2222,7 @@
         "optimist": {
           "version": "0.6.1",
           "bundled": true,
+          "dev": true,
           "requires": {
             "minimist": "~0.0.1",
             "wordwrap": "~0.0.2"
@@ -1958,11 +2230,13 @@
         },
         "os-homedir": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "os-locale": {
           "version": "2.1.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "execa": "^0.7.0",
             "lcid": "^1.0.0",
@@ -1971,11 +2245,13 @@
         },
         "p-finally": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "p-limit": {
           "version": "2.0.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "p-try": "^2.0.0"
           }
@@ -1983,17 +2259,20 @@
         "p-locate": {
           "version": "3.0.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "p-limit": "^2.0.0"
           }
         },
         "p-try": {
           "version": "2.0.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "package-hash": {
           "version": "2.0.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "graceful-fs": "^4.1.11",
             "lodash.flattendeep": "^4.4.0",
@@ -2004,6 +2283,7 @@
         "parse-json": {
           "version": "4.0.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "error-ex": "^1.3.1",
             "json-parse-better-errors": "^1.0.1"
@@ -2011,41 +2291,49 @@
         },
         "path-exists": {
           "version": "3.0.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "path-is-absolute": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "path-key": {
           "version": "2.0.1",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "path-type": {
           "version": "3.0.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "pify": "^3.0.0"
           }
         },
         "pify": {
           "version": "3.0.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "pkg-dir": {
           "version": "3.0.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "find-up": "^3.0.0"
           }
         },
         "pseudomap": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "read-pkg": {
           "version": "3.0.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "load-json-file": "^4.0.0",
             "normalize-package-data": "^2.3.2",
@@ -2055,6 +2343,7 @@
         "read-pkg-up": {
           "version": "4.0.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "find-up": "^3.0.0",
             "read-pkg": "^3.0.0"
@@ -2063,6 +2352,7 @@
         "release-zalgo": {
           "version": "1.0.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "es6-error": "^4.0.1"
           }
@@ -2070,23 +2360,27 @@
         "repeat-string": {
           "version": "1.6.1",
           "bundled": true,
-          "optional": true
+          "dev": true
         },
         "require-directory": {
           "version": "2.1.1",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "require-main-filename": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "resolve-from": {
           "version": "4.0.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "right-align": {
           "version": "0.1.3",
           "bundled": true,
+          "dev": true,
           "optional": true,
           "requires": {
             "align-text": "^0.1.1"
@@ -2095,45 +2389,54 @@
         "rimraf": {
           "version": "2.6.2",
           "bundled": true,
+          "dev": true,
           "requires": {
             "glob": "^7.0.5"
           }
         },
         "safe-buffer": {
           "version": "5.1.2",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "semver": {
           "version": "5.5.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "set-blocking": {
           "version": "2.0.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "shebang-command": {
           "version": "1.2.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "shebang-regex": "^1.0.0"
           }
         },
         "shebang-regex": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "signal-exit": {
           "version": "3.0.2",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "source-map": {
           "version": "0.5.7",
           "bundled": true,
+          "dev": true,
           "optional": true
         },
         "spawn-wrap": {
           "version": "1.4.2",
           "bundled": true,
+          "dev": true,
           "requires": {
             "foreground-child": "^1.5.6",
             "mkdirp": "^0.5.0",
@@ -2146,6 +2449,7 @@
         "spdx-correct": {
           "version": "3.0.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "spdx-expression-parse": "^3.0.0",
             "spdx-license-ids": "^3.0.0"
@@ -2153,11 +2457,13 @@
         },
         "spdx-exceptions": {
           "version": "2.1.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "spdx-expression-parse": {
           "version": "3.0.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "spdx-exceptions": "^2.1.0",
             "spdx-license-ids": "^3.0.0"
@@ -2165,11 +2471,13 @@
         },
         "spdx-license-ids": {
           "version": "3.0.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "string-width": {
           "version": "2.1.1",
           "bundled": true,
+          "dev": true,
           "requires": {
             "is-fullwidth-code-point": "^2.0.0",
             "strip-ansi": "^4.0.0"
@@ -2178,21 +2486,25 @@
         "strip-ansi": {
           "version": "4.0.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "ansi-regex": "^3.0.0"
           }
         },
         "strip-bom": {
           "version": "3.0.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "strip-eof": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "supports-color": {
           "version": "5.4.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "has-flag": "^3.0.0"
           }
@@ -2200,6 +2512,7 @@
         "test-exclude": {
           "version": "5.0.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "arrify": "^1.0.1",
             "minimatch": "^3.0.4",
@@ -2210,6 +2523,7 @@
         "uglify-js": {
           "version": "2.8.29",
           "bundled": true,
+          "dev": true,
           "optional": true,
           "requires": {
             "source-map": "~0.5.1",
@@ -2220,6 +2534,7 @@
             "yargs": {
               "version": "3.10.0",
               "bundled": true,
+              "dev": true,
               "optional": true,
               "requires": {
                 "camelcase": "^1.0.2",
@@ -2233,15 +2548,18 @@
         "uglify-to-browserify": {
           "version": "1.0.2",
           "bundled": true,
+          "dev": true,
           "optional": true
         },
         "uuid": {
           "version": "3.3.2",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "validate-npm-package-license": {
           "version": "3.0.3",
           "bundled": true,
+          "dev": true,
           "requires": {
             "spdx-correct": "^3.0.0",
             "spdx-expression-parse": "^3.0.0"
@@ -2250,26 +2568,31 @@
         "which": {
           "version": "1.3.1",
           "bundled": true,
+          "dev": true,
           "requires": {
             "isexe": "^2.0.0"
           }
         },
         "which-module": {
           "version": "2.0.0",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "window-size": {
           "version": "0.1.0",
           "bundled": true,
+          "dev": true,
           "optional": true
         },
         "wordwrap": {
           "version": "0.0.3",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "wrap-ansi": {
           "version": "2.1.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "string-width": "^1.0.1",
             "strip-ansi": "^3.0.1"
@@ -2277,11 +2600,13 @@
           "dependencies": {
             "ansi-regex": {
               "version": "2.1.1",
-              "bundled": true
+              "bundled": true,
+              "dev": true
             },
             "is-fullwidth-code-point": {
               "version": "1.0.0",
               "bundled": true,
+              "dev": true,
               "requires": {
                 "number-is-nan": "^1.0.0"
               }
@@ -2289,6 +2614,7 @@
             "string-width": {
               "version": "1.0.2",
               "bundled": true,
+              "dev": true,
               "requires": {
                 "code-point-at": "^1.0.0",
                 "is-fullwidth-code-point": "^1.0.0",
@@ -2298,6 +2624,7 @@
             "strip-ansi": {
               "version": "3.0.1",
               "bundled": true,
+              "dev": true,
               "requires": {
                 "ansi-regex": "^2.0.0"
               }
@@ -2306,11 +2633,13 @@
         },
         "wrappy": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "write-file-atomic": {
           "version": "2.3.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "graceful-fs": "^4.1.11",
             "imurmurhash": "^0.1.4",
@@ -2319,15 +2648,18 @@
         },
         "y18n": {
           "version": "3.2.1",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "yallist": {
           "version": "2.1.2",
-          "bundled": true
+          "bundled": true,
+          "dev": true
         },
         "yargs": {
           "version": "11.1.0",
           "bundled": true,
+          "dev": true,
           "requires": {
             "cliui": "^4.0.0",
             "decamelize": "^1.1.1",
@@ -2346,6 +2678,7 @@
             "cliui": {
               "version": "4.1.0",
               "bundled": true,
+              "dev": true,
               "requires": {
                 "string-width": "^2.1.1",
                 "strip-ansi": "^4.0.0",
@@ -2355,6 +2688,7 @@
             "find-up": {
               "version": "2.1.0",
               "bundled": true,
+              "dev": true,
               "requires": {
                 "locate-path": "^2.0.0"
               }
@@ -2362,6 +2696,7 @@
             "locate-path": {
               "version": "2.0.0",
               "bundled": true,
+              "dev": true,
               "requires": {
                 "p-locate": "^2.0.0",
                 "path-exists": "^3.0.0"
@@ -2370,6 +2705,7 @@
             "p-limit": {
               "version": "1.3.0",
               "bundled": true,
+              "dev": true,
               "requires": {
                 "p-try": "^1.0.0"
               }
@@ -2377,26 +2713,30 @@
             "p-locate": {
               "version": "2.0.0",
               "bundled": true,
+              "dev": true,
               "requires": {
                 "p-limit": "^1.1.0"
               }
             },
             "p-try": {
               "version": "1.0.0",
-              "bundled": true
+              "bundled": true,
+              "dev": true
             }
           }
         },
         "yargs-parser": {
           "version": "9.0.2",
           "bundled": true,
+          "dev": true,
           "requires": {
             "camelcase": "^4.1.0"
           },
           "dependencies": {
             "camelcase": {
               "version": "4.1.0",
-              "bundled": true
+              "bundled": true,
+              "dev": true
             }
           }
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@@ -2405,12 +2745,14 @@
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+      "dev": true,
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-      "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw="
+      "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
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+      "dev": true,
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@@ -2814,6 +3208,7 @@
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+          "dev": true,
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@@ -2824,6 +3219,7 @@
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+      "dev": true,
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@@ -2831,34 +3227,40 @@
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+          "integrity": "sha512-iB5Dda8t/UqpPI/IjsejXu5jOGDrzn41wJyljwPH65VCIbk6+1BzFIMJGFwTNrYXT1CrD+B4l19U7awiQ8rk7w==",
+          "dev": true
         }
       }
     },
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-      "integrity": "sha1-IzTBjpx1n3vdVv3vfprj1YjmjtM="
+      "integrity": "sha1-IzTBjpx1n3vdVv3vfprj1YjmjtM=",
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+      "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8=",
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+      "integrity": "sha1-XvjbKV0B5u1sv3qrlpmNeCJSe2g=",
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-      "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo="
+      "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
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+      "dev": true,
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       }
@@ -2867,6 +3269,7 @@
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+      "dev": true,
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@@ -2874,17 +3277,20 @@
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+      "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
+      "dev": true
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       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/timed-out/-/timed-out-4.0.1.tgz",
-      "integrity": "sha1-8y6srFoXW+ol1/q1Zas+2HQe9W8="
+      "integrity": "sha1-8y6srFoXW+ol1/q1Zas+2HQe9W8=",
+      "dev": true
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+      "dev": true,
       "requires": {
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@@ -2892,12 +3298,14 @@
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+      "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
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+      "dev": true,
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@@ -2906,24 +3314,28 @@
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-          "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4="
+          "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4=",
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       }
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+      "integrity": "sha1-tAPQuRvlDDMd/EuC7s6yLD3hbSA=",
+      "dev": true
     },
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       "version": "1.0.1",
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-      "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM="
+      "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=",
+      "dev": true
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+      "dev": true,
       "requires": {
         "arrify": "^1.0.0",
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@@ -2938,19 +3350,22 @@
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-          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ="
+          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
+          "dev": true
         }
       }
     },
     "tslib": {
       "version": "1.9.3",
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+      "integrity": "sha512-4krF8scpejhaOgqzBEcGM7yDIEfi0/8+8zDRZhNZZ2kjmHJ4hv3zCbQWxoJGz1iw5U0Jl0nma13xzHXcncMavQ==",
+      "dev": true
     },
     "tslint": {
       "version": "5.11.0",
       "resolved": "https://registry.npmjs.org/tslint/-/tslint-5.11.0.tgz",
       "integrity": "sha1-mPMMAurjzecAYgHkwzywi0hYHu0=",
+      "dev": true,
       "requires": {
         "babel-code-frame": "^6.22.0",
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@@ -2969,7 +3384,8 @@
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+          "integrity": "sha512-6tvAOO+D6OENvRAh524Dh9jcfKTYDQAqvqezbCW82xj5X0pSrcpxtvRKHLG0yBY6SD7PSDrJaj+0AiOcKVd1Xg==",
+          "dev": true
         }
       }
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@@ -2977,6 +3393,7 @@
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+      "dev": true,
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@@ -2985,6 +3402,7 @@
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       "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
+      "dev": true,
       "requires": {
         "safe-buffer": "^5.0.1"
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@@ -2992,17 +3410,20 @@
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-      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q="
+      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
+      "dev": true
     },
     "typescript": {
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+      "integrity": "sha512-Gr4p6nFNaoufRIY4NMdpQRNmgxVIGMs4Fcu/ujdYk3nAZqk7supzBE9idmvfZIlH/Cuj//dvi+019qEue9lV0w==",
+      "dev": true
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     "unique-string": {
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       "integrity": "sha1-nhBXzKhRq7kzmPizOuGHuZyuwRo=",
+      "dev": true,
       "requires": {
         "crypto-random-string": "^1.0.0"
       }
@@ -3010,12 +3431,14 @@
     "unzip-response": {
       "version": "2.0.1",
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-      "integrity": "sha1-0vD3N9FrBhXnKmk17QQhRXLVb5c="
+      "integrity": "sha1-0vD3N9FrBhXnKmk17QQhRXLVb5c=",
+      "dev": true
     },
     "update-notifier": {
       "version": "2.5.0",
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+      "dev": true,
       "requires": {
         "boxen": "^1.2.1",
         "chalk": "^2.0.1",
@@ -3033,6 +3456,7 @@
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+      "dev": true,
       "requires": {
         "punycode": "^2.1.0"
       }
@@ -3041,6 +3465,7 @@
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/url-parse-lax/-/url-parse-lax-1.0.0.tgz",
       "integrity": "sha1-evjzA2Rem9eaJy56FKxovAYJ2nM=",
+      "dev": true,
       "requires": {
         "prepend-http": "^1.0.1"
       }
@@ -3048,7 +3473,8 @@
     "urlgrey": {
       "version": "0.4.4",
       "resolved": "https://registry.npmjs.org/urlgrey/-/urlgrey-0.4.4.tgz",
-      "integrity": "sha1-iS/pWWCAXoVRnxzUOJ8stMu3ZS8="
+      "integrity": "sha1-iS/pWWCAXoVRnxzUOJ8stMu3ZS8=",
+      "dev": true
     },
     "uuid": {
       "version": "3.2.1",
@@ -3059,6 +3485,7 @@
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
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+      "dev": true,
       "requires": {
         "spdx-correct": "^3.0.0",
         "spdx-expression-parse": "^3.0.0"
@@ -3068,6 +3495,7 @@
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
       "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
+      "dev": true,
       "requires": {
         "assert-plus": "^1.0.0",
         "core-util-is": "1.0.2",
@@ -3078,6 +3506,7 @@
       "version": "1.3.1",
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+      "dev": true,
       "requires": {
         "isexe": "^2.0.0"
       }
@@ -3086,6 +3515,7 @@
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       "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-2.0.1.tgz",
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+      "dev": true,
       "requires": {
         "string-width": "^2.1.1"
       }
@@ -3093,12 +3523,14 @@
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
     },
     "write-file-atomic": {
       "version": "2.3.0",
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+      "dev": true,
       "requires": {
         "graceful-fs": "^4.1.11",
         "imurmurhash": "^0.1.4",
@@ -3108,17 +3540,20 @@
     "xdg-basedir": {
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       "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-3.0.0.tgz",
-      "integrity": "sha1-SWsswQnsqNus/i3HK2A8F8WHCtQ="
+      "integrity": "sha1-SWsswQnsqNus/i3HK2A8F8WHCtQ=",
+      "dev": true
     },
     "yallist": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
-      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI="
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
+      "dev": true
     },
     "yargs-parser": {
       "version": "10.1.0",
       "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-10.1.0.tgz",
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+      "dev": true,
       "requires": {
         "camelcase": "^4.1.0"
       }
@@ -3126,7 +3561,8 @@
     "yn": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/yn/-/yn-2.0.0.tgz",
-      "integrity": "sha1-5a2ryKz0CPY4X8dklWhMiOavaJo="
+      "integrity": "sha1-5a2ryKz0CPY4X8dklWhMiOavaJo=",
+      "dev": true
     }
   }
 }
diff --git a/packages/opencensus-exporter-stackdriver/src/stackdriver-stats-utils.ts b/packages/opencensus-exporter-stackdriver/src/stackdriver-stats-utils.ts
new file mode 100644
index 000000000..ed206d5bc
--- /dev/null
+++ b/packages/opencensus-exporter-stackdriver/src/stackdriver-stats-utils.ts
@@ -0,0 +1,288 @@
+/**
+ * Copyright 2019, OpenCensus Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {BucketOptions, DistributionBucket, DistributionValue, LabelKey, LabelValue, Metric, MetricDescriptor as OCMetricDescriptor, MetricDescriptorType, TimeSeriesPoint, Timestamp} from '@opencensus/core';
+import * as os from 'os';
+import * as path from 'path';
+import {Distribution, LabelDescriptor, MetricDescriptor, MetricKind, Point, TimeSeries, ValueType} from './types';
+
+/**
+ * Util methods to convert OpenCensus Metrics data models to StackDriver
+ * monitoring data models.
+ */
+export class StackdriverStatsExporterUtils {
+  static readonly OPENCENSUS_TASK: string = 'opencensus_task';
+  static readonly OPENCENSUS_TASK_DESCRIPTION: string =
+      'Opencensus task identifier';
+  static readonly OPENCENSUS_TASK_VALUE_DEFAULT =
+      StackdriverStatsExporterUtils.generateDefaultTaskValue();
+
+  /**
+   * Returns a task label value in the format of 'nodejs-<pid>@<hostname>'.
+   */
+  static generateDefaultTaskValue(): string {
+    const pid = process.pid;
+    const hostname = os.hostname() || 'localhost';
+    return 'nodejs-' + pid + '@' + hostname;
+  }
+
+  /**
+   * Converts a OpenCensus MetricDescriptor to a StackDriver MetricDescriptor.
+   * @param metricDescriptor The OpenCensus MetricDescriptor.
+   */
+  static createMetricDescriptorData(
+      metricDescriptor: OCMetricDescriptor, metricPrefix: string,
+      displayNamePrefix: string): MetricDescriptor {
+    return {
+      type: this.getMetricType(metricDescriptor.name, metricPrefix),
+      description: metricDescriptor.description,
+      displayName:
+          this.createDisplayName(metricDescriptor.name, displayNamePrefix),
+      metricKind: this.createMetricKind(metricDescriptor.type),
+      valueType: this.createValueType(metricDescriptor.type),
+      unit: metricDescriptor.unit,
+      labels: this.createLabelDescriptor(metricDescriptor.labelKeys)
+    } as MetricDescriptor;
+  }
+
+  /**
+   * Converts metric's timeseries to a list of TimeSeries, so that metric can be
+   * uploaded to StackDriver.
+   * @param metric The metric to get TimeSeries information from.
+   */
+  static createTimeSeriesList(
+      metric: Metric,
+      monitoredResource: {type: string, labels: {[key: string]: string}},
+      metricPrefix: string): TimeSeries[] {
+    const timeSeriesList: TimeSeries[] = [];
+
+    // TODO(mayurkale): Use Resource API here, once available (PR#173)
+    const metricDescriptor = metric.descriptor;
+    const metricKind = this.createMetricKind(metricDescriptor.type);
+    const valueType = this.createValueType(metricDescriptor.type);
+
+    for (const timeSeries of metric.timeseries) {
+      timeSeriesList.push({
+        metric: this.createMetric(
+            metricDescriptor, timeSeries.labelValues, metricPrefix),
+        resource: monitoredResource,
+        metricKind,
+        valueType,
+        points: timeSeries.points.map(point => {
+          return this.createPoint(point, timeSeries.startTimestamp, valueType);
+        })
+      });
+    }
+    return timeSeriesList;
+  }
+
+  /**
+   * Gets metric type.
+   * @param name The metric name.
+   * @param metricPrefix The metric prefix.
+   */
+  static getMetricType(name: string, metricPrefix: string): string {
+    return path.join(metricPrefix, name);
+  }
+
+  /**
+   * Creates Metric display name.
+   * @param name The metric name
+   * @param displayNamePrefix The metric display name.
+   */
+  static createDisplayName(name: string, displayNamePrefix: string): string {
+    return path.join(displayNamePrefix, name);
+  }
+
+  /**
+   * Converts a OpenCensus Type to a StackDriver MetricKind.
+   * @param metricDescriptorType The kind of metric.
+   */
+  static createMetricKind(metricDescriptorType: MetricDescriptorType):
+      MetricKind {
+    if (metricDescriptorType === MetricDescriptorType.GAUGE_INT64 ||
+        metricDescriptorType === MetricDescriptorType.GAUGE_DOUBLE) {
+      return MetricKind.GAUGE;
+    } else if (
+        metricDescriptorType === MetricDescriptorType.CUMULATIVE_INT64 ||
+        metricDescriptorType === MetricDescriptorType.CUMULATIVE_DOUBLE ||
+        metricDescriptorType === MetricDescriptorType.CUMULATIVE_DISTRIBUTION) {
+      return MetricKind.CUMULATIVE;
+    }
+    return MetricKind.UNSPECIFIED;
+  }
+
+  /**
+   * Converts a OpenCensus Type to a StackDriver ValueType.
+   * @param metricDescriptorType The kind of metric.
+   */
+  static createValueType(metricDescriptorType: MetricDescriptorType):
+      ValueType {
+    if (metricDescriptorType === MetricDescriptorType.CUMULATIVE_DOUBLE ||
+        metricDescriptorType === MetricDescriptorType.GAUGE_DOUBLE) {
+      return ValueType.DOUBLE;
+    } else if (
+        metricDescriptorType === MetricDescriptorType.GAUGE_INT64 ||
+        metricDescriptorType === MetricDescriptorType.CUMULATIVE_INT64) {
+      return ValueType.INT64;
+    } else if (
+        metricDescriptorType === MetricDescriptorType.GAUGE_DISTRIBUTION ||
+        metricDescriptorType === MetricDescriptorType.CUMULATIVE_DISTRIBUTION) {
+      return ValueType.DISTRIBUTION;
+    } else {
+      return ValueType.VALUE_TYPE_UNSPECIFIED;
+    }
+  }
+
+  /**
+   * Constructs a LabelDescriptor from a LabelKey.
+   * @param tag The Tags to get TimeSeries information from.
+   */
+  static createLabelDescriptor(labelKeys: LabelKey[]): LabelDescriptor[] {
+    const labelDescriptorList = labelKeys.map(labelKey => {
+      return {
+        key: labelKey.key,
+        valueType: 'STRING',  // Now we only support String type.
+        description: labelKey.description
+      } as LabelDescriptor;
+    });
+
+    // add default "opencensus_task" label.
+    labelDescriptorList.push({
+      key: StackdriverStatsExporterUtils.OPENCENSUS_TASK,
+      valueType: 'STRING',
+      description: StackdriverStatsExporterUtils.OPENCENSUS_TASK_DESCRIPTION
+    });
+    return labelDescriptorList;
+  }
+
+  /**
+   * Creates a Metric using the LabelKeys and LabelValues.
+   * @param metricDescriptor The OpenCensus MetricDescriptor.
+   * @param labelValues The OpenCensus LabelValue.
+   */
+  static createMetric(
+      metricDescriptor: OCMetricDescriptor, labelValues: LabelValue[],
+      metricPrefix: string): {type: string; labels: {[key: string]: string};} {
+    const type = this.getMetricType(metricDescriptor.name, metricPrefix);
+    const labels: {[key: string]: string} = {};
+    for (let i = 0; i < labelValues.length; i++) {
+      const value = labelValues[i].value;
+      if (value && metricDescriptor.labelKeys[i]) {
+        labels[metricDescriptor.labelKeys[i].key] = value;
+      } else {
+        // TODO(mayurkale) : consider to throw an error when LabelValue and
+        // LabelKey lengths are not same.
+      }
+    }
+    labels[StackdriverStatsExporterUtils.OPENCENSUS_TASK] =
+        StackdriverStatsExporterUtils.OPENCENSUS_TASK_VALUE_DEFAULT;
+    return {type, labels};
+  }
+
+  /**
+   * Converts timeseries's point, so that metric can be uploaded to StackDriver.
+   * @param point The timestamped measurement.
+   * @param startTimeStamp The start timestamp of timeseries.
+   * @param valueType The ValueType of metric.
+   */
+  static createPoint(
+      point: TimeSeriesPoint, startTimeStamp: Timestamp,
+      valueType: ValueType): Point {
+    let value;
+    if (valueType === ValueType.INT64) {
+      value = {int64Value: point.value as number};
+    } else if (valueType === ValueType.DOUBLE) {
+      value = {doubleValue: point.value as number};
+    } else if (valueType === ValueType.DISTRIBUTION) {
+      value = {
+        distributionValue:
+            this.createDistribution(point.value as DistributionValue)
+      };
+    } else {
+      // console.log(`${valueType} is not supported.`);
+    }
+
+    const endTime = this.toISOString(point.timestamp);
+    if (startTimeStamp) {
+      // Must be present for cumulative metrics.
+      const startTime = this.toISOString(startTimeStamp);
+      return {interval: {startTime, endTime}, value};
+    }
+
+    return {interval: {endTime}, value};
+  }
+
+  /**
+   * Formats an OpenCensus Distribution to Stackdriver's format.
+   * @param distribution The OpenCensus Distribution Data.
+   */
+  static createDistribution(distribution: DistributionValue): Distribution {
+    return {
+      count: distribution.count,
+      mean: distribution.count === 0 ? 0 :
+                                       distribution.sum / distribution.count,
+      sumOfSquaredDeviation: distribution.sumOfSquaredDeviation,
+      bucketOptions: {
+        explicitBuckets: {
+          bounds: this.createExplicitBucketOptions(distribution.bucketOptions)
+        }
+      },
+      bucketCounts: this.createBucketCounts(distribution.buckets)
+    };
+  }
+
+  /**
+   * Converts a OpenCensus BucketOptions to a StackDriver BucketOptions.
+   * @param buckets The DistributionValue BucketOptions.
+   */
+  static createExplicitBucketOptions(bucketOptions: BucketOptions): number[] {
+    const explicitBucketOptions: number[] = [];
+    // The first bucket bound should be 0.0 because the Metrics first bucket is
+    // [0, first_bound) but Stackdriver monitoring bucket bounds begin with
+    // -infinity (first bucket is (-infinity, 0))
+    explicitBucketOptions.push(0);
+    return explicitBucketOptions.concat(bucketOptions.explicit.bounds);
+  }
+
+  /**
+   * Converts a OpenCensus Buckets to a list of counts.
+   * @param buckets The DistributionValue buckets.
+   */
+  static createBucketCounts(buckets: DistributionBucket[]): number[] {
+    const bucketCounts: number[] = [];
+    // The first bucket (underflow bucket) should always be 0 count because the
+    // Metrics first bucket is [0, first_bound) but StackDriver distribution
+    // consists of an underflow bucket (number 0).
+    bucketCounts.push(0);
+    buckets.map((bucket: DistributionBucket) => {
+      bucketCounts.push(bucket.count);
+    });
+    return bucketCounts;
+  }
+
+  private static toISOString(timestamp: Timestamp) {
+    const str = new Date(timestamp.seconds * 1000).toISOString();
+    const nsStr = `${this.padNS(timestamp.nanos)}`.replace(/0+$/, '');
+    return str.replace('000Z', `${nsStr}Z`);
+  }
+
+  private static padNS(ns: number) {
+    const str = `${ns}`;
+    const pad = '000000000'.substring(0, 9 - str.length);
+    return `${pad}${str}`;
+  }
+}
diff --git a/packages/opencensus-exporter-stackdriver/src/types.ts b/packages/opencensus-exporter-stackdriver/src/types.ts
index 78191ff0b..83e035b75 100644
--- a/packages/opencensus-exporter-stackdriver/src/types.ts
+++ b/packages/opencensus-exporter-stackdriver/src/types.ts
@@ -103,7 +103,7 @@ export interface Distribution {
 }
 
 export interface Point {
-  interval: {endTime: string, startTime: string};
+  interval: {endTime: string, startTime?: string};
   value: {
     boolValue?: boolean;
     int64Value?: number;
@@ -115,8 +115,8 @@ export interface Point {
 
 export interface TimeSeries {
   metric: {type: string; labels: {[key: string]: string};};
-  resource: {type: 'global', labels: {[key: string]: string}};
+  resource: {type: string, labels: {[key: string]: string}};
   metricKind: MetricKind;
   valueType: ValueType;
   points: Point[];
-}
\ No newline at end of file
+}
diff --git a/packages/opencensus-exporter-stackdriver/test/test-stackdriver-stats-utils.ts b/packages/opencensus-exporter-stackdriver/test/test-stackdriver-stats-utils.ts
new file mode 100644
index 000000000..14e7845e2
--- /dev/null
+++ b/packages/opencensus-exporter-stackdriver/test/test-stackdriver-stats-utils.ts
@@ -0,0 +1,433 @@
+/**
+ * Copyright 2019, OpenCensus Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {DistributionValue, LabelKey, LabelValue, MetricDescriptor as OCMetricDescriptor, MetricDescriptorType, TimeSeriesPoint, Timestamp} from '@opencensus/core';
+import * as assert from 'assert';
+import {StackdriverStatsExporter} from '../src/stackdriver-monitoring';
+import {StackdriverStatsExporterUtils} from '../src/stackdriver-stats-utils';
+import {Distribution, MetricDescriptor, MetricKind, ValueType} from '../src/types';
+
+const METRIC_NAME = 'metric-name';
+const METRIC_DESCRIPTION = 'metric-description';
+const DEFAULT_UNIT = '1';
+
+describe('Stackdriver Stats Exporter Utils', () => {
+  describe('createMetricKind()', () => {
+    it('should return a Stackdriver MetricKind', () => {
+      assert.strictEqual(
+          StackdriverStatsExporterUtils.createMetricKind(
+              MetricDescriptorType.CUMULATIVE_INT64),
+          MetricKind.CUMULATIVE);
+      assert.strictEqual(
+          StackdriverStatsExporterUtils.createMetricKind(
+              MetricDescriptorType.GAUGE_INT64),
+          MetricKind.GAUGE);
+      assert.strictEqual(
+          StackdriverStatsExporterUtils.createMetricKind(
+              MetricDescriptorType.GAUGE_DOUBLE),
+          MetricKind.GAUGE);
+      assert.strictEqual(
+          StackdriverStatsExporterUtils.createMetricKind(
+              MetricDescriptorType.SUMMARY),
+          MetricKind.UNSPECIFIED);
+    });
+  });
+
+  describe('createValueType()', () => {
+    it('should return a Stackdriver ValueType', () => {
+      assert.strictEqual(
+          StackdriverStatsExporterUtils.createValueType(
+              MetricDescriptorType.GAUGE_DOUBLE),
+          ValueType.DOUBLE);
+      assert.strictEqual(
+          StackdriverStatsExporterUtils.createValueType(
+              MetricDescriptorType.CUMULATIVE_INT64),
+          ValueType.INT64);
+      assert.strictEqual(
+          StackdriverStatsExporterUtils.createValueType(
+              MetricDescriptorType.GAUGE_INT64),
+          ValueType.INT64);
+      assert.strictEqual(
+          StackdriverStatsExporterUtils.createValueType(
+              MetricDescriptorType.CUMULATIVE_DOUBLE),
+          ValueType.DOUBLE);
+      assert.strictEqual(
+          StackdriverStatsExporterUtils.createValueType(
+              MetricDescriptorType.CUMULATIVE_DISTRIBUTION),
+          ValueType.DISTRIBUTION);
+      assert.strictEqual(
+          StackdriverStatsExporterUtils.createValueType(
+              MetricDescriptorType.GAUGE_DISTRIBUTION),
+          ValueType.DISTRIBUTION);
+      assert.strictEqual(
+          StackdriverStatsExporterUtils.createValueType(
+              MetricDescriptorType.SUMMARY),
+          ValueType.VALUE_TYPE_UNSPECIFIED);
+    });
+  });
+
+  describe('createLabelDescriptor()', () => {
+    const labelKeys: LabelKey[] = [{'key': 'key', 'description': 'desc'}];
+
+    it('should return a Stackdriver LabelDescriptor', () => {
+      assert.deepStrictEqual(
+          StackdriverStatsExporterUtils.createLabelDescriptor(labelKeys), [
+            {description: 'desc', key: 'key', valueType: 'STRING'}, {
+              description:
+                  StackdriverStatsExporterUtils.OPENCENSUS_TASK_DESCRIPTION,
+              key: StackdriverStatsExporterUtils.OPENCENSUS_TASK,
+              valueType: 'STRING'
+            }
+          ]);
+    });
+  });
+
+  describe('createDisplayName()', () => {
+    it('should return a Stackdriver DisplayName', () => {
+      assert.strictEqual(
+          StackdriverStatsExporterUtils.createDisplayName(
+              'demo/latency', 'custom.googleapis.com/opencensus'),
+          'custom.googleapis.com/opencensus/demo/latency');
+    });
+  });
+
+  describe('getMetricType()', () => {
+    it('should return a Stackdriver MetricType', () => {
+      assert.strictEqual(
+          StackdriverStatsExporterUtils.getMetricType(
+              'demo/latency', 'opencensus'),
+          'opencensus/demo/latency');
+    });
+  });
+
+  describe('createMetric()', () => {
+    const labelKeys: LabelKey[] = [{'key': 'key1', 'description': 'desc'}];
+    const labelValues: LabelValue[] = [{'value': 'value1'}];
+    const metricDescriptor: OCMetricDescriptor = {
+      name: METRIC_NAME,
+      description: METRIC_DESCRIPTION,
+      unit: DEFAULT_UNIT,
+      type: MetricDescriptorType.GAUGE_INT64,
+      labelKeys
+    };
+
+    it('should return a Stackdriver Metric', () => {
+      const metric = StackdriverStatsExporterUtils.createMetric(
+          metricDescriptor, labelValues,
+          StackdriverStatsExporter.CUSTOM_OPENCENSUS_DOMAIN);
+      assert.strictEqual(
+          metric.type, `custom.googleapis.com/opencensus/${METRIC_NAME}`);
+      assert.deepStrictEqual(metric.labels, {
+        'key1': 'value1',
+        'opencensus_task':
+            StackdriverStatsExporterUtils.generateDefaultTaskValue()
+      });
+    });
+
+    it('should return a Stackdriver Metric With External Metric Domain', () => {
+      const prometheusDomain = 'external.googleapis.com/prometheus/';
+      const metric = StackdriverStatsExporterUtils.createMetric(
+          metricDescriptor, labelValues, prometheusDomain);
+      assert.strictEqual(metric.type, `${prometheusDomain}${METRIC_NAME}`);
+      assert.deepStrictEqual(metric.labels, {
+        'key1': 'value1',
+        'opencensus_task':
+            StackdriverStatsExporterUtils.generateDefaultTaskValue()
+      });
+    });
+
+    it('should return a Stackdriver Metric With Empty Label', () => {
+      const prometheusDomain = 'external.googleapis.com/prometheus/';
+      const metric = StackdriverStatsExporterUtils.createMetric(
+          metricDescriptor, [], prometheusDomain);
+      assert.strictEqual(metric.type, `${prometheusDomain}${METRIC_NAME}`);
+      assert.deepStrictEqual(metric.labels, {
+        'opencensus_task':
+            StackdriverStatsExporterUtils.generateDefaultTaskValue()
+      });
+    });
+  });
+
+  describe('createDistribution()', () => {
+    const distributionValue: DistributionValue = {
+      count: 3,
+      sum: 2,
+      sumOfSquaredDeviation: 14,
+      bucketOptions: {explicit: {bounds: [1.0, 3.0, 5.0]}},
+      buckets: [{count: 3}, {count: 1}, {count: 2}, {count: 4}],
+    };
+    it('should return a Stackdriver Distribution', () => {
+      const distribution: Distribution =
+          StackdriverStatsExporterUtils.createDistribution(distributionValue);
+
+      assert.strictEqual(distribution.count, 3);
+      assert.strictEqual(distribution.mean, 0.6666666666666666);
+      assert.strictEqual(distribution.sumOfSquaredDeviation, 14);
+      assert.deepStrictEqual(
+          distribution.bucketOptions,
+          {explicitBuckets: {bounds: [0, 1, 3, 5]}});
+      assert.deepStrictEqual(distribution.bucketCounts, [0, 3, 1, 2, 4]);
+    });
+  });
+
+  describe('createMetricDescriptorData()', () => {
+    const labelKeys: LabelKey[] = [{'key': 'key1', 'description': 'desc'}];
+    const metricDescriptor: OCMetricDescriptor = {
+      name: METRIC_NAME,
+      description: METRIC_DESCRIPTION,
+      unit: DEFAULT_UNIT,
+      type: MetricDescriptorType.GAUGE_INT64,
+      labelKeys
+    };
+    const metricDescriptor1: OCMetricDescriptor = {
+      name: METRIC_NAME,
+      description: METRIC_DESCRIPTION,
+      unit: DEFAULT_UNIT,
+      type: MetricDescriptorType.CUMULATIVE_INT64,
+      labelKeys
+    };
+
+    it('should return a Stackdriver MetricDescriptor', () => {
+      const descriptor: MetricDescriptor =
+          StackdriverStatsExporterUtils.createMetricDescriptorData(
+              metricDescriptor, 'custom.googleapis.com/myorg/', 'myorg/');
+
+      assert.strictEqual(descriptor.description, METRIC_DESCRIPTION);
+      assert.strictEqual(descriptor.displayName, `myorg/${METRIC_NAME}`);
+      assert.strictEqual(
+          descriptor.type, `custom.googleapis.com/myorg/${METRIC_NAME}`);
+      assert.strictEqual(descriptor.unit, DEFAULT_UNIT);
+      assert.strictEqual(descriptor.metricKind, MetricKind.GAUGE);
+      assert.strictEqual(descriptor.valueType, ValueType.INT64);
+      assert.deepStrictEqual(descriptor.labels, [
+        {description: 'desc', key: 'key1', valueType: 'STRING'}, {
+          description:
+              StackdriverStatsExporterUtils.OPENCENSUS_TASK_DESCRIPTION,
+          key: StackdriverStatsExporterUtils.OPENCENSUS_TASK,
+          valueType: 'STRING'
+        }
+      ]);
+    });
+
+    it('should return a Cumulative Stackdriver MetricDescriptor', () => {
+      const descriptor: MetricDescriptor =
+          StackdriverStatsExporterUtils.createMetricDescriptorData(
+              metricDescriptor1,
+              StackdriverStatsExporter.CUSTOM_OPENCENSUS_DOMAIN, 'OpenCensus');
+
+      assert.strictEqual(descriptor.description, METRIC_DESCRIPTION);
+      assert.strictEqual(descriptor.displayName, `OpenCensus/${METRIC_NAME}`);
+      assert.strictEqual(
+          descriptor.type,
+          `${StackdriverStatsExporter.CUSTOM_OPENCENSUS_DOMAIN}/${
+              METRIC_NAME}`);
+      assert.strictEqual(descriptor.unit, DEFAULT_UNIT);
+      assert.strictEqual(descriptor.metricKind, MetricKind.CUMULATIVE);
+      assert.strictEqual(descriptor.valueType, ValueType.INT64);
+      assert.deepStrictEqual(descriptor.labels, [
+        {description: 'desc', key: 'key1', valueType: 'STRING'}, {
+          description:
+              StackdriverStatsExporterUtils.OPENCENSUS_TASK_DESCRIPTION,
+          key: StackdriverStatsExporterUtils.OPENCENSUS_TASK,
+          valueType: 'STRING'
+        }
+      ]);
+    });
+  });
+
+  describe('createPoint()', () => {
+    const startTimestamp: Timestamp = {seconds: 1546998712, nanos: 20};
+    const pointTimestamp = {seconds: 1546998775, nanos: 10};
+    const intPoint:
+        TimeSeriesPoint = {value: 12345678, timestamp: pointTimestamp};
+    const doublePoint:
+        TimeSeriesPoint = {value: 12345678.2, timestamp: pointTimestamp};
+    const distributionPoint: TimeSeriesPoint = {
+      value: {
+        count: 3,
+        sum: 2,
+        sumOfSquaredDeviation: 14,
+        bucketOptions: {explicit: {bounds: [1.2, 3.2, 5.2]}},
+        buckets: [{count: 3}, {count: 1}, {count: 2}, {count: 4}],
+      } as DistributionValue,
+      timestamp: pointTimestamp
+    };
+
+    it('should return a Stackdriver Point', () => {
+      const pt = StackdriverStatsExporterUtils.createPoint(
+          doublePoint, null, ValueType.DOUBLE);
+
+      assert.deepStrictEqual(pt, {
+        value: {doubleValue: 12345678.2},
+        interval: {endTime: '2019-01-09T01:52:55.00000001Z'}
+      });
+    });
+
+    it('should return a Stackdriver Cumulative Point', () => {
+      const pt = StackdriverStatsExporterUtils.createPoint(
+          intPoint, startTimestamp, ValueType.INT64);
+
+      assert.deepStrictEqual(pt, {
+        value: {int64Value: 12345678},
+        interval: {
+          startTime: '2019-01-09T01:51:52.00000002Z',
+          endTime: '2019-01-09T01:52:55.00000001Z'
+        }
+      });
+    });
+
+    it('should return a Stackdriver Distribution Point', () => {
+      const pt = StackdriverStatsExporterUtils.createPoint(
+          distributionPoint, startTimestamp, ValueType.DISTRIBUTION);
+
+      assert.deepStrictEqual(pt, {
+        value: {
+          distributionValue: {
+            count: 3,
+            mean: 0.6666666666666666,
+            sumOfSquaredDeviation: 14,
+            bucketOptions: {explicitBuckets: {bounds: [0, 1.2, 3.2, 5.2]}},
+            bucketCounts: [0, 3, 1, 2, 4]
+          }
+        },
+        interval: {
+          startTime: '2019-01-09T01:51:52.00000002Z',
+          endTime: '2019-01-09T01:52:55.00000001Z'
+        }
+      });
+    });
+  });
+
+  describe('createTimeSeriesList()', () => {
+    const metricPrefix = StackdriverStatsExporter.CUSTOM_OPENCENSUS_DOMAIN;
+    const defaultResource = {type: 'global', labels: {}};
+    const customResource = {
+      type: 'global',
+      labels: {'name': 'p0001', 'zone': 'us-west-1'}
+    };
+    const labelKeys = [{'key': 'key1', 'description': 'desc'}];
+    const labelValues = [{'value': 'value1'}];
+    const labelValues2 = [{'value': 'value2'}];
+    const cumulativeMetricDescriptor = {
+      name: METRIC_NAME,
+      description: METRIC_DESCRIPTION,
+      unit: DEFAULT_UNIT,
+      type: MetricDescriptorType.CUMULATIVE_DOUBLE,
+      labelKeys
+    };
+    const pointTimestamp = {seconds: 100, nanos: 1e7};
+    const doublePoint = {value: 12345678.2, timestamp: pointTimestamp};
+    const startTimestamp: Timestamp = {seconds: 90, nanos: 1e7};
+    const cumulativeTimeSeries = {
+      labelValues,
+      points: [doublePoint],
+      startTimestamp
+    };
+    const metric = {
+      descriptor: cumulativeMetricDescriptor,
+      timeseries: [cumulativeTimeSeries]
+    };
+
+    const gaugeMetricDescriptor = {
+      name: METRIC_NAME,
+      description: METRIC_DESCRIPTION,
+      unit: DEFAULT_UNIT,
+      type: MetricDescriptorType.GAUGE_DOUBLE,
+      labelKeys
+    };
+    const gaugePoint1 = {value: 10, timestamp: pointTimestamp};
+    const gaugePoint2 = {value: 15, timestamp: pointTimestamp};
+    const gaugeTimeSeries1 = {labelValues, points: [gaugePoint1]};
+    const gaugeTimeSeries2 = {labelValues: labelValues2, points: [gaugePoint2]};
+    const gaugeMetric = {
+      descriptor: gaugeMetricDescriptor,
+      timeseries: [gaugeTimeSeries1, gaugeTimeSeries2]
+    };
+
+    it('should return a Stackdriver TimeSeries', () => {
+      const timeSeriesList = StackdriverStatsExporterUtils.createTimeSeriesList(
+          metric, defaultResource, metricPrefix);
+
+      assert.equal(timeSeriesList.length, 1);
+      const [timeseries] = timeSeriesList;
+      assert.deepStrictEqual(
+          timeseries.metric.type,
+          'custom.googleapis.com/opencensus/metric-name');
+      assert.deepStrictEqual(timeseries.metric.labels, {
+        'key1': 'value1',
+        'opencensus_task':
+            StackdriverStatsExporterUtils.generateDefaultTaskValue()
+      });
+      assert.deepStrictEqual(timeseries.metricKind, MetricKind.CUMULATIVE);
+      assert.deepStrictEqual(timeseries.valueType, ValueType.DOUBLE);
+      assert.deepStrictEqual(timeseries.resource, {type: 'global', labels: {}});
+      assert.deepStrictEqual(timeseries.points.length, 1);
+      const [point] = timeseries.points;
+      assert.deepStrictEqual(point.value, {doubleValue: 12345678.2});
+    });
+
+    it('should return a Stackdriver TimeSeries with custom monitored resource',
+       () => {
+         const timeSeriesList =
+             StackdriverStatsExporterUtils.createTimeSeriesList(
+                 metric, customResource, metricPrefix);
+
+         assert.equal(timeSeriesList.length, 1);
+         const [timeseries] = timeSeriesList;
+         assert.deepStrictEqual(
+             timeseries.metric.type,
+             'custom.googleapis.com/opencensus/metric-name');
+         assert.deepStrictEqual(timeseries.metric.labels, {
+           'key1': 'value1',
+           'opencensus_task':
+               StackdriverStatsExporterUtils.generateDefaultTaskValue()
+         });
+         assert.deepStrictEqual(
+             timeseries.resource,
+             {type: 'global', labels: {'name': 'p0001', 'zone': 'us-west-1'}});
+         assert.deepStrictEqual(timeseries.points.length, 1);
+         const [point] = timeseries.points;
+         assert.deepStrictEqual(point.value, {doubleValue: 12345678.2});
+       });
+
+    it('should return a Stackdriver TimeSeries with Gauge and multiple timeseries',
+       () => {
+         const timeSeriesList =
+             StackdriverStatsExporterUtils.createTimeSeriesList(
+                 gaugeMetric, defaultResource, metricPrefix);
+
+         assert.equal(timeSeriesList.length, 2);
+         const [timeseries1, timeseries2] = timeSeriesList;
+         assert.deepStrictEqual(
+             timeseries1.metric.type,
+             'custom.googleapis.com/opencensus/metric-name');
+         assert.deepStrictEqual(timeseries1.metric.labels, {
+           'key1': 'value1',
+           'opencensus_task':
+               StackdriverStatsExporterUtils.generateDefaultTaskValue()
+         });
+         assert.deepStrictEqual(timeseries1.metricKind, MetricKind.GAUGE);
+         assert.deepStrictEqual(timeseries1.valueType, ValueType.DOUBLE);
+         assert.deepStrictEqual(
+             timeseries1.resource, {type: 'global', labels: {}});
+         assert.deepStrictEqual(timeseries1.points.length, 1);
+         const [point1] = timeseries1.points;
+         assert.deepStrictEqual(point1.value, {doubleValue: 10});
+         const [point2] = timeseries2.points;
+         assert.deepStrictEqual(point2.value, {doubleValue: 15});
+       });
+  });
+});

From c9aa60a47ac6cbdb657220a6178a75b1f1484955 Mon Sep 17 00:00:00 2001
From: Mayur Kale <mayurkale@google.com>
Date: Wed, 9 Jan 2019 12:11:31 -0800
Subject: [PATCH 2/3] fix review comments

---
 .../src/stackdriver-stats-utils.ts            | 440 ++++++++----------
 .../src/types.ts                              |  11 +-
 .../test/test-stackdriver-stats-utils.ts      | 149 +++---
 3 files changed, 263 insertions(+), 337 deletions(-)

diff --git a/packages/opencensus-exporter-stackdriver/src/stackdriver-stats-utils.ts b/packages/opencensus-exporter-stackdriver/src/stackdriver-stats-utils.ts
index ed206d5bc..a23ef6cae 100644
--- a/packages/opencensus-exporter-stackdriver/src/stackdriver-stats-utils.ts
+++ b/packages/opencensus-exporter-stackdriver/src/stackdriver-stats-utils.ts
@@ -17,272 +17,226 @@
 import {BucketOptions, DistributionBucket, DistributionValue, LabelKey, LabelValue, Metric, MetricDescriptor as OCMetricDescriptor, MetricDescriptorType, TimeSeriesPoint, Timestamp} from '@opencensus/core';
 import * as os from 'os';
 import * as path from 'path';
-import {Distribution, LabelDescriptor, MetricDescriptor, MetricKind, Point, TimeSeries, ValueType} from './types';
+
+import {Distribution, LabelDescriptor, MetricDescriptor, MetricKind, MonitoredResource, Point, TimeSeries, ValueType} from './types';
+
+const OPENCENSUS_TASK = 'opencensus_task';
+const OPENCENSUS_TASK_DESCRIPTION = 'Opencensus task identifier';
+export const OPENCENSUS_TASK_VALUE_DEFAULT = generateDefaultTaskValue();
+
+/** Converts a OpenCensus MetricDescriptor to a StackDriver MetricDescriptor. */
+export function createMetricDescriptorData(
+    metricDescriptor: OCMetricDescriptor, metricPrefix: string,
+    displayNamePrefix: string): MetricDescriptor {
+  return {
+    type: getMetricType(metricDescriptor.name, metricPrefix),
+    description: metricDescriptor.description,
+    displayName: createDisplayName(metricDescriptor.name, displayNamePrefix),
+    metricKind: createMetricKind(metricDescriptor.type),
+    valueType: createValueType(metricDescriptor.type),
+    unit: metricDescriptor.unit,
+    labels: createLabelDescriptor(metricDescriptor.labelKeys)
+  };
+}
 
 /**
- * Util methods to convert OpenCensus Metrics data models to StackDriver
- * monitoring data models.
+ * Converts metric's timeseries to a list of TimeSeries, so that metric can be
+ * uploaded to StackDriver.
  */
-export class StackdriverStatsExporterUtils {
-  static readonly OPENCENSUS_TASK: string = 'opencensus_task';
-  static readonly OPENCENSUS_TASK_DESCRIPTION: string =
-      'Opencensus task identifier';
-  static readonly OPENCENSUS_TASK_VALUE_DEFAULT =
-      StackdriverStatsExporterUtils.generateDefaultTaskValue();
-
-  /**
-   * Returns a task label value in the format of 'nodejs-<pid>@<hostname>'.
-   */
-  static generateDefaultTaskValue(): string {
-    const pid = process.pid;
-    const hostname = os.hostname() || 'localhost';
-    return 'nodejs-' + pid + '@' + hostname;
-  }
-
-  /**
-   * Converts a OpenCensus MetricDescriptor to a StackDriver MetricDescriptor.
-   * @param metricDescriptor The OpenCensus MetricDescriptor.
-   */
-  static createMetricDescriptorData(
-      metricDescriptor: OCMetricDescriptor, metricPrefix: string,
-      displayNamePrefix: string): MetricDescriptor {
-    return {
-      type: this.getMetricType(metricDescriptor.name, metricPrefix),
-      description: metricDescriptor.description,
-      displayName:
-          this.createDisplayName(metricDescriptor.name, displayNamePrefix),
-      metricKind: this.createMetricKind(metricDescriptor.type),
-      valueType: this.createValueType(metricDescriptor.type),
-      unit: metricDescriptor.unit,
-      labels: this.createLabelDescriptor(metricDescriptor.labelKeys)
-    } as MetricDescriptor;
+export function createTimeSeriesList(
+    metric: Metric, monitoredResource: MonitoredResource,
+    metricPrefix: string): TimeSeries[] {
+  const timeSeriesList: TimeSeries[] = [];
+
+  // TODO(mayurkale): Use Resource API here, once available (PR#173)
+  const metricDescriptor = metric.descriptor;
+  const metricKind = createMetricKind(metricDescriptor.type);
+  const valueType = createValueType(metricDescriptor.type);
+
+  for (const timeSeries of metric.timeseries) {
+    timeSeriesList.push({
+      metric:
+          createMetric(metricDescriptor, timeSeries.labelValues, metricPrefix),
+      resource: monitoredResource,
+      metricKind,
+      valueType,
+      points: timeSeries.points.map(point => {
+        return createPoint(point, timeSeries.startTimestamp, valueType);
+      })
+    });
   }
+  return timeSeriesList;
+}
 
-  /**
-   * Converts metric's timeseries to a list of TimeSeries, so that metric can be
-   * uploaded to StackDriver.
-   * @param metric The metric to get TimeSeries information from.
-   */
-  static createTimeSeriesList(
-      metric: Metric,
-      monitoredResource: {type: string, labels: {[key: string]: string}},
-      metricPrefix: string): TimeSeries[] {
-    const timeSeriesList: TimeSeries[] = [];
-
-    // TODO(mayurkale): Use Resource API here, once available (PR#173)
-    const metricDescriptor = metric.descriptor;
-    const metricKind = this.createMetricKind(metricDescriptor.type);
-    const valueType = this.createValueType(metricDescriptor.type);
+/** Creates Metric type. */
+export function getMetricType(name: string, metricPrefix: string): string {
+  return path.join(metricPrefix, name);
+}
 
-    for (const timeSeries of metric.timeseries) {
-      timeSeriesList.push({
-        metric: this.createMetric(
-            metricDescriptor, timeSeries.labelValues, metricPrefix),
-        resource: monitoredResource,
-        metricKind,
-        valueType,
-        points: timeSeries.points.map(point => {
-          return this.createPoint(point, timeSeries.startTimestamp, valueType);
-        })
-      });
-    }
-    return timeSeriesList;
-  }
+/** Creates Metric display name. */
+export function createDisplayName(
+    name: string, displayNamePrefix: string): string {
+  return path.join(displayNamePrefix, name);
+}
 
-  /**
-   * Gets metric type.
-   * @param name The metric name.
-   * @param metricPrefix The metric prefix.
-   */
-  static getMetricType(name: string, metricPrefix: string): string {
-    return path.join(metricPrefix, name);
+/** Converts a OpenCensus Type to a StackDriver MetricKind. */
+export function createMetricKind(metricDescriptorType: MetricDescriptorType):
+    MetricKind {
+  if (metricDescriptorType === MetricDescriptorType.GAUGE_INT64 ||
+      metricDescriptorType === MetricDescriptorType.GAUGE_DOUBLE) {
+    return MetricKind.GAUGE;
+  } else if (
+      metricDescriptorType === MetricDescriptorType.CUMULATIVE_INT64 ||
+      metricDescriptorType === MetricDescriptorType.CUMULATIVE_DOUBLE ||
+      metricDescriptorType === MetricDescriptorType.CUMULATIVE_DISTRIBUTION) {
+    return MetricKind.CUMULATIVE;
   }
+  return MetricKind.UNSPECIFIED;
+}
 
-  /**
-   * Creates Metric display name.
-   * @param name The metric name
-   * @param displayNamePrefix The metric display name.
-   */
-  static createDisplayName(name: string, displayNamePrefix: string): string {
-    return path.join(displayNamePrefix, name);
+/** Converts a OpenCensus Type to a StackDriver ValueType. */
+export function createValueType(metricDescriptorType: MetricDescriptorType):
+    ValueType {
+  if (metricDescriptorType === MetricDescriptorType.CUMULATIVE_DOUBLE ||
+      metricDescriptorType === MetricDescriptorType.GAUGE_DOUBLE) {
+    return ValueType.DOUBLE;
+  } else if (
+      metricDescriptorType === MetricDescriptorType.GAUGE_INT64 ||
+      metricDescriptorType === MetricDescriptorType.CUMULATIVE_INT64) {
+    return ValueType.INT64;
+  } else if (
+      metricDescriptorType === MetricDescriptorType.GAUGE_DISTRIBUTION ||
+      metricDescriptorType === MetricDescriptorType.CUMULATIVE_DISTRIBUTION) {
+    return ValueType.DISTRIBUTION;
+  } else {
+    return ValueType.VALUE_TYPE_UNSPECIFIED;
   }
+}
 
-  /**
-   * Converts a OpenCensus Type to a StackDriver MetricKind.
-   * @param metricDescriptorType The kind of metric.
-   */
-  static createMetricKind(metricDescriptorType: MetricDescriptorType):
-      MetricKind {
-    if (metricDescriptorType === MetricDescriptorType.GAUGE_INT64 ||
-        metricDescriptorType === MetricDescriptorType.GAUGE_DOUBLE) {
-      return MetricKind.GAUGE;
-    } else if (
-        metricDescriptorType === MetricDescriptorType.CUMULATIVE_INT64 ||
-        metricDescriptorType === MetricDescriptorType.CUMULATIVE_DOUBLE ||
-        metricDescriptorType === MetricDescriptorType.CUMULATIVE_DISTRIBUTION) {
-      return MetricKind.CUMULATIVE;
-    }
-    return MetricKind.UNSPECIFIED;
-  }
+/** Constructs a LabelDescriptor from a LabelKey. */
+export function createLabelDescriptor(labelKeys: LabelKey[]):
+    LabelDescriptor[] {
+  const labelDescriptorList: LabelDescriptor[] =
+      labelKeys.map(labelKey => ({
+                      key: labelKey.key,
+                      valueType: 'STRING',  // Now we only support String type.
+                      description: labelKey.description
+                    }));
+
+  // add default "opencensus_task" label.
+  labelDescriptorList.push({
+    key: OPENCENSUS_TASK,
+    valueType: 'STRING',
+    description: OPENCENSUS_TASK_DESCRIPTION
+  });
+  return labelDescriptorList;
+}
 
-  /**
-   * Converts a OpenCensus Type to a StackDriver ValueType.
-   * @param metricDescriptorType The kind of metric.
-   */
-  static createValueType(metricDescriptorType: MetricDescriptorType):
-      ValueType {
-    if (metricDescriptorType === MetricDescriptorType.CUMULATIVE_DOUBLE ||
-        metricDescriptorType === MetricDescriptorType.GAUGE_DOUBLE) {
-      return ValueType.DOUBLE;
-    } else if (
-        metricDescriptorType === MetricDescriptorType.GAUGE_INT64 ||
-        metricDescriptorType === MetricDescriptorType.CUMULATIVE_INT64) {
-      return ValueType.INT64;
-    } else if (
-        metricDescriptorType === MetricDescriptorType.GAUGE_DISTRIBUTION ||
-        metricDescriptorType === MetricDescriptorType.CUMULATIVE_DISTRIBUTION) {
-      return ValueType.DISTRIBUTION;
+/** Creates a Metric using the LabelKeys and LabelValues. */
+export function createMetric(
+    metricDescriptor: OCMetricDescriptor, labelValues: LabelValue[],
+    metricPrefix: string): {type: string; labels: {[key: string]: string};} {
+  const type = getMetricType(metricDescriptor.name, metricPrefix);
+  const labels: {[key: string]: string} = {};
+  for (let i = 0; i < labelValues.length; i++) {
+    const value = labelValues[i].value;
+    if (value && metricDescriptor.labelKeys[i]) {
+      labels[metricDescriptor.labelKeys[i].key] = value;
     } else {
-      return ValueType.VALUE_TYPE_UNSPECIFIED;
-    }
-  }
-
-  /**
-   * Constructs a LabelDescriptor from a LabelKey.
-   * @param tag The Tags to get TimeSeries information from.
-   */
-  static createLabelDescriptor(labelKeys: LabelKey[]): LabelDescriptor[] {
-    const labelDescriptorList = labelKeys.map(labelKey => {
-      return {
-        key: labelKey.key,
-        valueType: 'STRING',  // Now we only support String type.
-        description: labelKey.description
-      } as LabelDescriptor;
-    });
-
-    // add default "opencensus_task" label.
-    labelDescriptorList.push({
-      key: StackdriverStatsExporterUtils.OPENCENSUS_TASK,
-      valueType: 'STRING',
-      description: StackdriverStatsExporterUtils.OPENCENSUS_TASK_DESCRIPTION
-    });
-    return labelDescriptorList;
-  }
-
-  /**
-   * Creates a Metric using the LabelKeys and LabelValues.
-   * @param metricDescriptor The OpenCensus MetricDescriptor.
-   * @param labelValues The OpenCensus LabelValue.
-   */
-  static createMetric(
-      metricDescriptor: OCMetricDescriptor, labelValues: LabelValue[],
-      metricPrefix: string): {type: string; labels: {[key: string]: string};} {
-    const type = this.getMetricType(metricDescriptor.name, metricPrefix);
-    const labels: {[key: string]: string} = {};
-    for (let i = 0; i < labelValues.length; i++) {
-      const value = labelValues[i].value;
-      if (value && metricDescriptor.labelKeys[i]) {
-        labels[metricDescriptor.labelKeys[i].key] = value;
-      } else {
-        // TODO(mayurkale) : consider to throw an error when LabelValue and
-        // LabelKey lengths are not same.
-      }
+      // TODO(mayurkale) : consider to throw an error when LabelValue and
+      // LabelKey lengths are not same.
     }
-    labels[StackdriverStatsExporterUtils.OPENCENSUS_TASK] =
-        StackdriverStatsExporterUtils.OPENCENSUS_TASK_VALUE_DEFAULT;
-    return {type, labels};
   }
+  labels[OPENCENSUS_TASK] = OPENCENSUS_TASK_VALUE_DEFAULT;
+  return {type, labels};
+}
 
-  /**
-   * Converts timeseries's point, so that metric can be uploaded to StackDriver.
-   * @param point The timestamped measurement.
-   * @param startTimeStamp The start timestamp of timeseries.
-   * @param valueType The ValueType of metric.
-   */
-  static createPoint(
-      point: TimeSeriesPoint, startTimeStamp: Timestamp,
-      valueType: ValueType): Point {
-    let value;
-    if (valueType === ValueType.INT64) {
-      value = {int64Value: point.value as number};
-    } else if (valueType === ValueType.DOUBLE) {
-      value = {doubleValue: point.value as number};
-    } else if (valueType === ValueType.DISTRIBUTION) {
-      value = {
-        distributionValue:
-            this.createDistribution(point.value as DistributionValue)
-      };
-    } else {
-      // console.log(`${valueType} is not supported.`);
-    }
-
-    const endTime = this.toISOString(point.timestamp);
-    if (startTimeStamp) {
-      // Must be present for cumulative metrics.
-      const startTime = this.toISOString(startTimeStamp);
-      return {interval: {startTime, endTime}, value};
-    }
-
-    return {interval: {endTime}, value};
+/**
+ * Converts timeseries's point, so that metric can be uploaded to StackDriver.
+ */
+export function createPoint(
+    point: TimeSeriesPoint, startTimeStamp: Timestamp,
+    valueType: ValueType): Point {
+  const value = createValue(valueType, point);
+  const endTime = toISOString(point.timestamp);
+  if (startTimeStamp) {
+    // Must be present for cumulative metrics.
+    const startTime = toISOString(startTimeStamp);
+    return {interval: {startTime, endTime}, value};
   }
+  return {interval: {endTime}, value};
+}
 
-  /**
-   * Formats an OpenCensus Distribution to Stackdriver's format.
-   * @param distribution The OpenCensus Distribution Data.
-   */
-  static createDistribution(distribution: DistributionValue): Distribution {
+/** Converts a OpenCensus Point's value to a StackDriver Point value. */
+export function createValue(valueType: ValueType, point: TimeSeriesPoint) {
+  if (valueType === ValueType.INT64) {
+    return {int64Value: point.value as number};
+  } else if (valueType === ValueType.DOUBLE) {
+    return {doubleValue: point.value as number};
+  } else if (valueType === ValueType.DISTRIBUTION) {
     return {
-      count: distribution.count,
-      mean: distribution.count === 0 ? 0 :
-                                       distribution.sum / distribution.count,
-      sumOfSquaredDeviation: distribution.sumOfSquaredDeviation,
-      bucketOptions: {
-        explicitBuckets: {
-          bounds: this.createExplicitBucketOptions(distribution.bucketOptions)
-        }
-      },
-      bucketCounts: this.createBucketCounts(distribution.buckets)
+      distributionValue: createDistribution(point.value as DistributionValue)
     };
   }
+  throw Error(`unsupported value type: ${valueType}`);
+}
 
-  /**
-   * Converts a OpenCensus BucketOptions to a StackDriver BucketOptions.
-   * @param buckets The DistributionValue BucketOptions.
-   */
-  static createExplicitBucketOptions(bucketOptions: BucketOptions): number[] {
-    const explicitBucketOptions: number[] = [];
-    // The first bucket bound should be 0.0 because the Metrics first bucket is
-    // [0, first_bound) but Stackdriver monitoring bucket bounds begin with
-    // -infinity (first bucket is (-infinity, 0))
-    explicitBucketOptions.push(0);
-    return explicitBucketOptions.concat(bucketOptions.explicit.bounds);
-  }
+/** Formats an OpenCensus Distribution to Stackdriver's format. */
+export function createDistribution(distribution: DistributionValue):
+    Distribution {
+  return {
+    count: distribution.count,
+    mean: distribution.count === 0 ? 0 : distribution.sum / distribution.count,
+    sumOfSquaredDeviation: distribution.sumOfSquaredDeviation,
+    bucketOptions: {
+      explicitBuckets:
+          {bounds: createExplicitBucketOptions(distribution.bucketOptions)}
+    },
+    bucketCounts: createBucketCounts(distribution.buckets)
+  };
+}
 
-  /**
-   * Converts a OpenCensus Buckets to a list of counts.
-   * @param buckets The DistributionValue buckets.
-   */
-  static createBucketCounts(buckets: DistributionBucket[]): number[] {
-    const bucketCounts: number[] = [];
-    // The first bucket (underflow bucket) should always be 0 count because the
-    // Metrics first bucket is [0, first_bound) but StackDriver distribution
-    // consists of an underflow bucket (number 0).
-    bucketCounts.push(0);
-    buckets.map((bucket: DistributionBucket) => {
-      bucketCounts.push(bucket.count);
-    });
-    return bucketCounts;
-  }
+/** Converts a OpenCensus BucketOptions to a StackDriver BucketOptions. */
+export function createExplicitBucketOptions(bucketOptions: BucketOptions):
+    number[] {
+  const explicitBucketOptions: number[] = [];
+  // The first bucket bound should be 0.0 because the Metrics first bucket is
+  // [0, first_bound) but Stackdriver monitoring bucket bounds begin with
+  // -infinity (first bucket is (-infinity, 0))
+  explicitBucketOptions.push(0);
+  return explicitBucketOptions.concat(bucketOptions.explicit.bounds);
+}
 
-  private static toISOString(timestamp: Timestamp) {
-    const str = new Date(timestamp.seconds * 1000).toISOString();
-    const nsStr = `${this.padNS(timestamp.nanos)}`.replace(/0+$/, '');
-    return str.replace('000Z', `${nsStr}Z`);
-  }
+/** Converts a OpenCensus Buckets to a list of counts. */
+export function createBucketCounts(buckets: DistributionBucket[]): number[] {
+  const bucketCounts: number[] = [];
+  // The first bucket (underflow bucket) should always be 0 count because the
+  // Metrics first bucket is [0, first_bound) but StackDriver distribution
+  // consists of an underflow bucket (number 0).
+  bucketCounts.push(0);
+  buckets.map((bucket: DistributionBucket) => {
+    bucketCounts.push(bucket.count);
+  });
+  return bucketCounts;
+}
 
-  private static padNS(ns: number) {
-    const str = `${ns}`;
-    const pad = '000000000'.substring(0, 9 - str.length);
-    return `${pad}${str}`;
-  }
+/** Returns a task label value in the format of 'nodejs-<pid>@<hostname>'. */
+function generateDefaultTaskValue(): string {
+  console.log('inside generateDefaultTaskValue');
+  const pid = process.pid;
+  const hostname = os.hostname() || 'localhost';
+  return 'nodejs-' + pid + '@' + hostname;
+}
+
+function toISOString(timestamp: Timestamp) {
+  const str = new Date(timestamp.seconds * 1000).toISOString();
+  const nsStr = `${leftZeroPad(timestamp.nanos)}`.replace(/0+$/, '');
+  return str.replace('000Z', `${nsStr}Z`);
+}
+
+/** Pad a number with 0 on the left */
+function leftZeroPad(ns: number) {
+  const str = `${ns}`;
+  const pad = '000000000'.substring(0, 9 - str.length);
+  return `${pad}${str}`;
 }
diff --git a/packages/opencensus-exporter-stackdriver/src/types.ts b/packages/opencensus-exporter-stackdriver/src/types.ts
index 83e035b75..bb3e37883 100644
--- a/packages/opencensus-exporter-stackdriver/src/types.ts
+++ b/packages/opencensus-exporter-stackdriver/src/types.ts
@@ -115,8 +115,17 @@ export interface Point {
 
 export interface TimeSeries {
   metric: {type: string; labels: {[key: string]: string};};
-  resource: {type: string, labels: {[key: string]: string}};
+  resource: MonitoredResource;
   metricKind: MetricKind;
   valueType: ValueType;
   points: Point[];
 }
+
+/** Resource information. */
+export interface MonitoredResource {
+  /** Type identifier for the resource. */
+  type: string;
+
+  /** Set of labels that describe the resource. */
+  labels: {[key: string]: string};
+}
diff --git a/packages/opencensus-exporter-stackdriver/test/test-stackdriver-stats-utils.ts b/packages/opencensus-exporter-stackdriver/test/test-stackdriver-stats-utils.ts
index 14e7845e2..848d4da11 100644
--- a/packages/opencensus-exporter-stackdriver/test/test-stackdriver-stats-utils.ts
+++ b/packages/opencensus-exporter-stackdriver/test/test-stackdriver-stats-utils.ts
@@ -16,8 +16,9 @@
 
 import {DistributionValue, LabelKey, LabelValue, MetricDescriptor as OCMetricDescriptor, MetricDescriptorType, TimeSeriesPoint, Timestamp} from '@opencensus/core';
 import * as assert from 'assert';
+
 import {StackdriverStatsExporter} from '../src/stackdriver-monitoring';
-import {StackdriverStatsExporterUtils} from '../src/stackdriver-stats-utils';
+import {createDisplayName, createDistribution, createLabelDescriptor, createMetric, createMetricDescriptorData, createMetricKind, createPoint, createTimeSeriesList, createValueType, getMetricType, OPENCENSUS_TASK_VALUE_DEFAULT} from '../src/stackdriver-stats-utils';
 import {Distribution, MetricDescriptor, MetricKind, ValueType} from '../src/types';
 
 const METRIC_NAME = 'metric-name';
@@ -28,20 +29,15 @@ describe('Stackdriver Stats Exporter Utils', () => {
   describe('createMetricKind()', () => {
     it('should return a Stackdriver MetricKind', () => {
       assert.strictEqual(
-          StackdriverStatsExporterUtils.createMetricKind(
-              MetricDescriptorType.CUMULATIVE_INT64),
+          createMetricKind(MetricDescriptorType.CUMULATIVE_INT64),
           MetricKind.CUMULATIVE);
       assert.strictEqual(
-          StackdriverStatsExporterUtils.createMetricKind(
-              MetricDescriptorType.GAUGE_INT64),
-          MetricKind.GAUGE);
+          createMetricKind(MetricDescriptorType.GAUGE_INT64), MetricKind.GAUGE);
       assert.strictEqual(
-          StackdriverStatsExporterUtils.createMetricKind(
-              MetricDescriptorType.GAUGE_DOUBLE),
+          createMetricKind(MetricDescriptorType.GAUGE_DOUBLE),
           MetricKind.GAUGE);
       assert.strictEqual(
-          StackdriverStatsExporterUtils.createMetricKind(
-              MetricDescriptorType.SUMMARY),
+          createMetricKind(MetricDescriptorType.SUMMARY),
           MetricKind.UNSPECIFIED);
     });
   });
@@ -49,32 +45,23 @@ describe('Stackdriver Stats Exporter Utils', () => {
   describe('createValueType()', () => {
     it('should return a Stackdriver ValueType', () => {
       assert.strictEqual(
-          StackdriverStatsExporterUtils.createValueType(
-              MetricDescriptorType.GAUGE_DOUBLE),
-          ValueType.DOUBLE);
+          createValueType(MetricDescriptorType.GAUGE_DOUBLE), ValueType.DOUBLE);
       assert.strictEqual(
-          StackdriverStatsExporterUtils.createValueType(
-              MetricDescriptorType.CUMULATIVE_INT64),
+          createValueType(MetricDescriptorType.CUMULATIVE_INT64),
           ValueType.INT64);
       assert.strictEqual(
-          StackdriverStatsExporterUtils.createValueType(
-              MetricDescriptorType.GAUGE_INT64),
-          ValueType.INT64);
+          createValueType(MetricDescriptorType.GAUGE_INT64), ValueType.INT64);
       assert.strictEqual(
-          StackdriverStatsExporterUtils.createValueType(
-              MetricDescriptorType.CUMULATIVE_DOUBLE),
+          createValueType(MetricDescriptorType.CUMULATIVE_DOUBLE),
           ValueType.DOUBLE);
       assert.strictEqual(
-          StackdriverStatsExporterUtils.createValueType(
-              MetricDescriptorType.CUMULATIVE_DISTRIBUTION),
+          createValueType(MetricDescriptorType.CUMULATIVE_DISTRIBUTION),
           ValueType.DISTRIBUTION);
       assert.strictEqual(
-          StackdriverStatsExporterUtils.createValueType(
-              MetricDescriptorType.GAUGE_DISTRIBUTION),
+          createValueType(MetricDescriptorType.GAUGE_DISTRIBUTION),
           ValueType.DISTRIBUTION);
       assert.strictEqual(
-          StackdriverStatsExporterUtils.createValueType(
-              MetricDescriptorType.SUMMARY),
+          createValueType(MetricDescriptorType.SUMMARY),
           ValueType.VALUE_TYPE_UNSPECIFIED);
     });
   });
@@ -83,23 +70,20 @@ describe('Stackdriver Stats Exporter Utils', () => {
     const labelKeys: LabelKey[] = [{'key': 'key', 'description': 'desc'}];
 
     it('should return a Stackdriver LabelDescriptor', () => {
-      assert.deepStrictEqual(
-          StackdriverStatsExporterUtils.createLabelDescriptor(labelKeys), [
-            {description: 'desc', key: 'key', valueType: 'STRING'}, {
-              description:
-                  StackdriverStatsExporterUtils.OPENCENSUS_TASK_DESCRIPTION,
-              key: StackdriverStatsExporterUtils.OPENCENSUS_TASK,
-              valueType: 'STRING'
-            }
-          ]);
+      assert.deepStrictEqual(createLabelDescriptor(labelKeys), [
+        {description: 'desc', key: 'key', valueType: 'STRING'}, {
+          description: 'Opencensus task identifier',
+          key: 'opencensus_task',
+          valueType: 'STRING'
+        }
+      ]);
     });
   });
 
   describe('createDisplayName()', () => {
     it('should return a Stackdriver DisplayName', () => {
       assert.strictEqual(
-          StackdriverStatsExporterUtils.createDisplayName(
-              'demo/latency', 'custom.googleapis.com/opencensus'),
+          createDisplayName('demo/latency', 'custom.googleapis.com/opencensus'),
           'custom.googleapis.com/opencensus/demo/latency');
     });
   });
@@ -107,8 +91,7 @@ describe('Stackdriver Stats Exporter Utils', () => {
   describe('getMetricType()', () => {
     it('should return a Stackdriver MetricType', () => {
       assert.strictEqual(
-          StackdriverStatsExporterUtils.getMetricType(
-              'demo/latency', 'opencensus'),
+          getMetricType('demo/latency', 'opencensus'),
           'opencensus/demo/latency');
     });
   });
@@ -125,39 +108,32 @@ describe('Stackdriver Stats Exporter Utils', () => {
     };
 
     it('should return a Stackdriver Metric', () => {
-      const metric = StackdriverStatsExporterUtils.createMetric(
+      const metric = createMetric(
           metricDescriptor, labelValues,
           StackdriverStatsExporter.CUSTOM_OPENCENSUS_DOMAIN);
       assert.strictEqual(
           metric.type, `custom.googleapis.com/opencensus/${METRIC_NAME}`);
-      assert.deepStrictEqual(metric.labels, {
-        'key1': 'value1',
-        'opencensus_task':
-            StackdriverStatsExporterUtils.generateDefaultTaskValue()
-      });
+      assert.deepStrictEqual(
+          metric.labels,
+          {'key1': 'value1', 'opencensus_task': OPENCENSUS_TASK_VALUE_DEFAULT});
     });
 
     it('should return a Stackdriver Metric With External Metric Domain', () => {
       const prometheusDomain = 'external.googleapis.com/prometheus/';
-      const metric = StackdriverStatsExporterUtils.createMetric(
-          metricDescriptor, labelValues, prometheusDomain);
+      const metric =
+          createMetric(metricDescriptor, labelValues, prometheusDomain);
       assert.strictEqual(metric.type, `${prometheusDomain}${METRIC_NAME}`);
-      assert.deepStrictEqual(metric.labels, {
-        'key1': 'value1',
-        'opencensus_task':
-            StackdriverStatsExporterUtils.generateDefaultTaskValue()
-      });
+      assert.deepStrictEqual(
+          metric.labels,
+          {'key1': 'value1', 'opencensus_task': OPENCENSUS_TASK_VALUE_DEFAULT});
     });
 
     it('should return a Stackdriver Metric With Empty Label', () => {
       const prometheusDomain = 'external.googleapis.com/prometheus/';
-      const metric = StackdriverStatsExporterUtils.createMetric(
-          metricDescriptor, [], prometheusDomain);
+      const metric = createMetric(metricDescriptor, [], prometheusDomain);
       assert.strictEqual(metric.type, `${prometheusDomain}${METRIC_NAME}`);
-      assert.deepStrictEqual(metric.labels, {
-        'opencensus_task':
-            StackdriverStatsExporterUtils.generateDefaultTaskValue()
-      });
+      assert.deepStrictEqual(
+          metric.labels, {'opencensus_task': OPENCENSUS_TASK_VALUE_DEFAULT});
     });
   });
 
@@ -170,8 +146,7 @@ describe('Stackdriver Stats Exporter Utils', () => {
       buckets: [{count: 3}, {count: 1}, {count: 2}, {count: 4}],
     };
     it('should return a Stackdriver Distribution', () => {
-      const distribution: Distribution =
-          StackdriverStatsExporterUtils.createDistribution(distributionValue);
+      const distribution: Distribution = createDistribution(distributionValue);
 
       assert.strictEqual(distribution.count, 3);
       assert.strictEqual(distribution.mean, 0.6666666666666666);
@@ -201,9 +176,8 @@ describe('Stackdriver Stats Exporter Utils', () => {
     };
 
     it('should return a Stackdriver MetricDescriptor', () => {
-      const descriptor: MetricDescriptor =
-          StackdriverStatsExporterUtils.createMetricDescriptorData(
-              metricDescriptor, 'custom.googleapis.com/myorg/', 'myorg/');
+      const descriptor: MetricDescriptor = createMetricDescriptorData(
+          metricDescriptor, 'custom.googleapis.com/myorg/', 'myorg/');
 
       assert.strictEqual(descriptor.description, METRIC_DESCRIPTION);
       assert.strictEqual(descriptor.displayName, `myorg/${METRIC_NAME}`);
@@ -214,19 +188,17 @@ describe('Stackdriver Stats Exporter Utils', () => {
       assert.strictEqual(descriptor.valueType, ValueType.INT64);
       assert.deepStrictEqual(descriptor.labels, [
         {description: 'desc', key: 'key1', valueType: 'STRING'}, {
-          description:
-              StackdriverStatsExporterUtils.OPENCENSUS_TASK_DESCRIPTION,
-          key: StackdriverStatsExporterUtils.OPENCENSUS_TASK,
+          description: 'Opencensus task identifier',
+          key: 'opencensus_task',
           valueType: 'STRING'
         }
       ]);
     });
 
     it('should return a Cumulative Stackdriver MetricDescriptor', () => {
-      const descriptor: MetricDescriptor =
-          StackdriverStatsExporterUtils.createMetricDescriptorData(
-              metricDescriptor1,
-              StackdriverStatsExporter.CUSTOM_OPENCENSUS_DOMAIN, 'OpenCensus');
+      const descriptor: MetricDescriptor = createMetricDescriptorData(
+          metricDescriptor1, StackdriverStatsExporter.CUSTOM_OPENCENSUS_DOMAIN,
+          'OpenCensus');
 
       assert.strictEqual(descriptor.description, METRIC_DESCRIPTION);
       assert.strictEqual(descriptor.displayName, `OpenCensus/${METRIC_NAME}`);
@@ -239,9 +211,8 @@ describe('Stackdriver Stats Exporter Utils', () => {
       assert.strictEqual(descriptor.valueType, ValueType.INT64);
       assert.deepStrictEqual(descriptor.labels, [
         {description: 'desc', key: 'key1', valueType: 'STRING'}, {
-          description:
-              StackdriverStatsExporterUtils.OPENCENSUS_TASK_DESCRIPTION,
-          key: StackdriverStatsExporterUtils.OPENCENSUS_TASK,
+          description: 'Opencensus task identifier',
+          key: 'opencensus_task',
           valueType: 'STRING'
         }
       ]);
@@ -267,8 +238,7 @@ describe('Stackdriver Stats Exporter Utils', () => {
     };
 
     it('should return a Stackdriver Point', () => {
-      const pt = StackdriverStatsExporterUtils.createPoint(
-          doublePoint, null, ValueType.DOUBLE);
+      const pt = createPoint(doublePoint, null, ValueType.DOUBLE);
 
       assert.deepStrictEqual(pt, {
         value: {doubleValue: 12345678.2},
@@ -277,8 +247,7 @@ describe('Stackdriver Stats Exporter Utils', () => {
     });
 
     it('should return a Stackdriver Cumulative Point', () => {
-      const pt = StackdriverStatsExporterUtils.createPoint(
-          intPoint, startTimestamp, ValueType.INT64);
+      const pt = createPoint(intPoint, startTimestamp, ValueType.INT64);
 
       assert.deepStrictEqual(pt, {
         value: {int64Value: 12345678},
@@ -290,7 +259,7 @@ describe('Stackdriver Stats Exporter Utils', () => {
     });
 
     it('should return a Stackdriver Distribution Point', () => {
-      const pt = StackdriverStatsExporterUtils.createPoint(
+      const pt = createPoint(
           distributionPoint, startTimestamp, ValueType.DISTRIBUTION);
 
       assert.deepStrictEqual(pt, {
@@ -358,19 +327,17 @@ describe('Stackdriver Stats Exporter Utils', () => {
     };
 
     it('should return a Stackdriver TimeSeries', () => {
-      const timeSeriesList = StackdriverStatsExporterUtils.createTimeSeriesList(
-          metric, defaultResource, metricPrefix);
+      const timeSeriesList =
+          createTimeSeriesList(metric, defaultResource, metricPrefix);
 
       assert.equal(timeSeriesList.length, 1);
       const [timeseries] = timeSeriesList;
       assert.deepStrictEqual(
           timeseries.metric.type,
           'custom.googleapis.com/opencensus/metric-name');
-      assert.deepStrictEqual(timeseries.metric.labels, {
-        'key1': 'value1',
-        'opencensus_task':
-            StackdriverStatsExporterUtils.generateDefaultTaskValue()
-      });
+      assert.deepStrictEqual(
+          timeseries.metric.labels,
+          {'key1': 'value1', 'opencensus_task': OPENCENSUS_TASK_VALUE_DEFAULT});
       assert.deepStrictEqual(timeseries.metricKind, MetricKind.CUMULATIVE);
       assert.deepStrictEqual(timeseries.valueType, ValueType.DOUBLE);
       assert.deepStrictEqual(timeseries.resource, {type: 'global', labels: {}});
@@ -382,8 +349,7 @@ describe('Stackdriver Stats Exporter Utils', () => {
     it('should return a Stackdriver TimeSeries with custom monitored resource',
        () => {
          const timeSeriesList =
-             StackdriverStatsExporterUtils.createTimeSeriesList(
-                 metric, customResource, metricPrefix);
+             createTimeSeriesList(metric, customResource, metricPrefix);
 
          assert.equal(timeSeriesList.length, 1);
          const [timeseries] = timeSeriesList;
@@ -392,8 +358,7 @@ describe('Stackdriver Stats Exporter Utils', () => {
              'custom.googleapis.com/opencensus/metric-name');
          assert.deepStrictEqual(timeseries.metric.labels, {
            'key1': 'value1',
-           'opencensus_task':
-               StackdriverStatsExporterUtils.generateDefaultTaskValue()
+           'opencensus_task': OPENCENSUS_TASK_VALUE_DEFAULT
          });
          assert.deepStrictEqual(
              timeseries.resource,
@@ -406,8 +371,7 @@ describe('Stackdriver Stats Exporter Utils', () => {
     it('should return a Stackdriver TimeSeries with Gauge and multiple timeseries',
        () => {
          const timeSeriesList =
-             StackdriverStatsExporterUtils.createTimeSeriesList(
-                 gaugeMetric, defaultResource, metricPrefix);
+             createTimeSeriesList(gaugeMetric, defaultResource, metricPrefix);
 
          assert.equal(timeSeriesList.length, 2);
          const [timeseries1, timeseries2] = timeSeriesList;
@@ -416,8 +380,7 @@ describe('Stackdriver Stats Exporter Utils', () => {
              'custom.googleapis.com/opencensus/metric-name');
          assert.deepStrictEqual(timeseries1.metric.labels, {
            'key1': 'value1',
-           'opencensus_task':
-               StackdriverStatsExporterUtils.generateDefaultTaskValue()
+           'opencensus_task': OPENCENSUS_TASK_VALUE_DEFAULT
          });
          assert.deepStrictEqual(timeseries1.metricKind, MetricKind.GAUGE);
          assert.deepStrictEqual(timeseries1.valueType, ValueType.DOUBLE);

From 4c4a190b17cb553f978107445d3f62760c235f1b Mon Sep 17 00:00:00 2001
From: Mayur Kale <mayurkale@google.com>
Date: Wed, 9 Jan 2019 22:52:08 -0800
Subject: [PATCH 3/3] remove temp log

---
 .../src/stackdriver-stats-utils.ts                               | 1 -
 1 file changed, 1 deletion(-)

diff --git a/packages/opencensus-exporter-stackdriver/src/stackdriver-stats-utils.ts b/packages/opencensus-exporter-stackdriver/src/stackdriver-stats-utils.ts
index a23ef6cae..bd9cc0ec9 100644
--- a/packages/opencensus-exporter-stackdriver/src/stackdriver-stats-utils.ts
+++ b/packages/opencensus-exporter-stackdriver/src/stackdriver-stats-utils.ts
@@ -222,7 +222,6 @@ export function createBucketCounts(buckets: DistributionBucket[]): number[] {
 
 /** Returns a task label value in the format of 'nodejs-<pid>@<hostname>'. */
 function generateDefaultTaskValue(): string {
-  console.log('inside generateDefaultTaskValue');
   const pid = process.pid;
   const hostname = os.hostname() || 'localhost';
   return 'nodejs-' + pid + '@' + hostname;