Move metrics to setup and add cgroup metrics (elastic#76730)

# Conflicts:
#	src/core/server/config/deprecation/core_deprecations.ts

docs/development/core/server/kibana-plugin-core-server.md

@@ -123,7 +123,7 @@ The plugin integrates with the core system via lifecycle events: `setup`<!-- -->
 |  [LoggerFactory](./kibana-plugin-core-server.loggerfactory.md) | The single purpose of <code>LoggerFactory</code> interface is to define a way to retrieve a context-based logger instance. |
 |  [LoggingServiceSetup](./kibana-plugin-core-server.loggingservicesetup.md) | Provides APIs to plugins for customizing the plugin's logger. |
 |  [LogMeta](./kibana-plugin-core-server.logmeta.md) | Contextual metadata |
-|  [MetricsServiceSetup](./kibana-plugin-core-server.metricsservicesetup.md) |  |
+|  [MetricsServiceSetup](./kibana-plugin-core-server.metricsservicesetup.md) | APIs to retrieves metrics gathered and exposed by the core platform. |
 |  [NodesVersionCompatibility](./kibana-plugin-core-server.nodesversioncompatibility.md) |  |
 |  [OnPostAuthToolkit](./kibana-plugin-core-server.onpostauthtoolkit.md) | A tool set defining an outcome of OnPostAuth interceptor for incoming request. |
 |  [OnPreAuthToolkit](./kibana-plugin-core-server.onpreauthtoolkit.md) | A tool set defining an outcome of OnPreAuth interceptor for incoming request. |

docs/development/core/server/kibana-plugin-core-server.metricsservicesetup.collectioninterval.md

@@ -0,0 +1,13 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-core-server](./kibana-plugin-core-server.md) &gt; [MetricsServiceSetup](./kibana-plugin-core-server.metricsservicesetup.md) &gt; [collectionInterval](./kibana-plugin-core-server.metricsservicesetup.collectioninterval.md)
+
+## MetricsServiceSetup.collectionInterval property
+
+Interval metrics are collected in milliseconds
+
+<b>Signature:</b>
+
+```typescript
+readonly collectionInterval: number;
+```

docs/development/core/server/kibana-plugin-core-server.metricsservicesetup.getopsmetrics_.md

@@ -0,0 +1,24 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-core-server](./kibana-plugin-core-server.md) &gt; [MetricsServiceSetup](./kibana-plugin-core-server.metricsservicesetup.md) &gt; [getOpsMetrics$](./kibana-plugin-core-server.metricsservicesetup.getopsmetrics_.md)
+
+## MetricsServiceSetup.getOpsMetrics$ property
+
+Retrieve an observable emitting the [OpsMetrics](./kibana-plugin-core-server.opsmetrics.md) gathered. The observable will emit an initial value during core's `start` phase, and a new value every fixed interval of time, based on the `opts.interval` configuration property.
+
+<b>Signature:</b>
+
+```typescript
+getOpsMetrics$: () => Observable<OpsMetrics>;
+```
+
+## Example
+
+
+```ts
+core.metrics.getOpsMetrics$().subscribe(metrics => {
+  // do something with the metrics
+})
+
+```
+

docs/development/core/server/kibana-plugin-core-server.metricsservicesetup.md

@@ -4,8 +4,18 @@
 
 ## MetricsServiceSetup interface
 
+APIs to retrieves metrics gathered and exposed by the core platform.
+
 <b>Signature:</b>
 
 ```typescript
 export interface MetricsServiceSetup 
 ```
+
+## Properties
+
+|  Property | Type | Description |
+|  --- | --- | --- |
+|  [collectionInterval](./kibana-plugin-core-server.metricsservicesetup.collectioninterval.md) | <code>number</code> | Interval metrics are collected in milliseconds |
+|  [getOpsMetrics$](./kibana-plugin-core-server.metricsservicesetup.getopsmetrics_.md) | <code>() =&gt; Observable&lt;OpsMetrics&gt;</code> | Retrieve an observable emitting the [OpsMetrics](./kibana-plugin-core-server.opsmetrics.md) gathered. The observable will emit an initial value during core's <code>start</code> phase, and a new value every fixed interval of time, based on the <code>opts.interval</code> configuration property. |
+

docs/development/core/server/kibana-plugin-core-server.opsmetrics.collected_at.md

@@ -0,0 +1,13 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-core-server](./kibana-plugin-core-server.md) &gt; [OpsMetrics](./kibana-plugin-core-server.opsmetrics.md) &gt; [collected\_at](./kibana-plugin-core-server.opsmetrics.collected_at.md)
+
+## OpsMetrics.collected\_at property
+
+Time metrics were recorded at.
+
+<b>Signature:</b>
+
+```typescript
+collected_at: Date;
+```

docs/development/core/server/kibana-plugin-core-server.opsmetrics.md

@@ -16,6 +16,7 @@ export interface OpsMetrics
 
 |  Property | Type | Description |
 |  --- | --- | --- |
+|  [collected\_at](./kibana-plugin-core-server.opsmetrics.collected_at.md) | <code>Date</code> | Time metrics were recorded at. |
 |  [concurrent\_connections](./kibana-plugin-core-server.opsmetrics.concurrent_connections.md) | <code>OpsServerMetrics['concurrent_connections']</code> | number of current concurrent connections to the server |
 |  [os](./kibana-plugin-core-server.opsmetrics.os.md) | <code>OpsOsMetrics</code> | OS related metrics |
 |  [process](./kibana-plugin-core-server.opsmetrics.process.md) | <code>OpsProcessMetrics</code> | Process related metrics |

docs/development/core/server/kibana-plugin-core-server.opsosmetrics.cpu.md

@@ -0,0 +1,22 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-core-server](./kibana-plugin-core-server.md) &gt; [OpsOsMetrics](./kibana-plugin-core-server.opsosmetrics.md) &gt; [cpu](./kibana-plugin-core-server.opsosmetrics.cpu.md)
+
+## OpsOsMetrics.cpu property
+
+cpu cgroup metrics, undefined when not running in a cgroup
+
+<b>Signature:</b>
+
+```typescript
+cpu?: {
+        control_group: string;
+        cfs_period_micros: number;
+        cfs_quota_micros: number;
+        stat: {
+            number_of_elapsed_periods: number;
+            number_of_times_throttled: number;
+            time_throttled_nanos: number;
+        };
+    };
+```

docs/development/core/server/kibana-plugin-core-server.opsosmetrics.cpuacct.md

@@ -0,0 +1,16 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-core-server](./kibana-plugin-core-server.md) &gt; [OpsOsMetrics](./kibana-plugin-core-server.opsosmetrics.md) &gt; [cpuacct](./kibana-plugin-core-server.opsosmetrics.cpuacct.md)
+
+## OpsOsMetrics.cpuacct property
+
+cpu accounting metrics, undefined when not running in a cgroup
+
+<b>Signature:</b>
+
+```typescript
+cpuacct?: {
+        control_group: string;
+        usage_nanos: number;
+    };
+```

docs/development/core/server/kibana-plugin-core-server.opsosmetrics.md

@@ -16,6 +16,8 @@ export interface OpsOsMetrics
 
 |  Property | Type | Description |
 |  --- | --- | --- |
+|  [cpu](./kibana-plugin-core-server.opsosmetrics.cpu.md) | <code>{</code><br/><code>        control_group: string;</code><br/><code>        cfs_period_micros: number;</code><br/><code>        cfs_quota_micros: number;</code><br/><code>        stat: {</code><br/><code>            number_of_elapsed_periods: number;</code><br/><code>            number_of_times_throttled: number;</code><br/><code>            time_throttled_nanos: number;</code><br/><code>        };</code><br/><code>    }</code> | cpu cgroup metrics, undefined when not running in a cgroup |
+|  [cpuacct](./kibana-plugin-core-server.opsosmetrics.cpuacct.md) | <code>{</code><br/><code>        control_group: string;</code><br/><code>        usage_nanos: number;</code><br/><code>    }</code> | cpu accounting metrics, undefined when not running in a cgroup |
 |  [distro](./kibana-plugin-core-server.opsosmetrics.distro.md) | <code>string</code> | The os distrib. Only present for linux platforms |
 |  [distroRelease](./kibana-plugin-core-server.opsosmetrics.distrorelease.md) | <code>string</code> | The os distrib release, prefixed by the os distrib. Only present for linux platforms |
 |  [load](./kibana-plugin-core-server.opsosmetrics.load.md) | <code>{</code><br/><code>        '1m': number;</code><br/><code>        '5m': number;</code><br/><code>        '15m': number;</code><br/><code>    }</code> | cpu load metrics |

docs/setup/settings.asciidoc

@@ -20,12 +20,12 @@ which may cause a delay before pages start being served.
 Set to `false` to disable Console. *Default: `true`*
 
 | `cpu.cgroup.path.override:`
- | Override for cgroup cpu path when mounted in a
-manner that is inconsistent with `/proc/self/cgroup`.
+ | *deprecated* This setting has been renamed to `ops.cGroupOverrides.cpuPath`
+and the old name will no longer be supported as of 8.0.
 
 | `cpuacct.cgroup.path.override:`
- | Override for cgroup cpuacct path when mounted
-in a manner that is inconsistent with `/proc/self/cgroup`.
+ | *deprecated* This setting has been renamed to `ops.cGroupOverrides.cpuAcctPath`
+and the old name will no longer be supported as of 8.0.
 
 | `csp.rules:`
  | A https://w3c.github.io/webappsec-csp/[content-security-policy] template
@@ -438,6 +438,14 @@ not saved in {es}. *Default: `data`*
  | Set the interval in milliseconds to sample
 system and process performance metrics. The minimum value is 100. *Default: `5000`*
 
+| `ops.cGroupOverrides.cpuPath:`
+ | Override for cgroup cpu path when mounted in a
+manner that is inconsistent with `/proc/self/cgroup`.
+
+| `ops.cGroupOverrides.cpuAcctPath:`
+ | Override for cgroup cpuacct path when mounted
+in a manner that is inconsistent with `/proc/self/cgroup`.
+
 | `server.basePath:`
  | Enables you to specify a path to mount {kib} at if you are
 running behind a proxy. Use the `server.rewriteBasePath` setting to tell {kib}

src/core/public/core_app/status/lib/load_status.test.ts

@@ -57,6 +57,7 @@ const mockedResponse: StatusResponse = {
     ],
   },
   metrics: {
+    collected_at: new Date('2020-01-01 01:00:00'),
     collection_interval_in_millis: 1000,
     os: {
       platform: 'darwin' as const,

src/core/server/config/deprecation/core_deprecations.ts

@@ -146,6 +146,8 @@ export const coreDeprecationProvider: ConfigDeprecationProvider = ({
   renameFromRoot('xpack.telemetry.config', 'telemetry.config'),
   renameFromRoot('xpack.telemetry.banner', 'telemetry.banner'),
   renameFromRoot('xpack.telemetry.url', 'telemetry.url'),
+  renameFromRoot('cpu.cgroup.path.override', 'ops.cGroupOverrides.cpuPath'),
+  renameFromRoot('cpuacct.cgroup.path.override', 'ops.cGroupOverrides.cpuAcctPath'),
   configPathDeprecation,
   dataPathDeprecation,
   rewriteBasePathDeprecation,

src/core/server/legacy/legacy_service.ts

@@ -264,6 +264,7 @@ export class LegacyService implements CoreService {
         getTypeRegistry: startDeps.core.savedObjects.getTypeRegistry,
       },
       metrics: {
+        collectionInterval: startDeps.core.metrics.collectionInterval,
         getOpsMetrics$: startDeps.core.metrics.getOpsMetrics$,
       },
       uiSettings: { asScopedToClient: startDeps.core.uiSettings.asScopedToClient },

src/core/server/metrics/collectors/cgroup.test.ts

@@ -0,0 +1,115 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you 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 mockFs from 'mock-fs';
+import { OsCgroupMetricsCollector } from './cgroup';
+
+describe('OsCgroupMetricsCollector', () => {
+  afterEach(() => mockFs.restore());
+
+  it('returns empty object when no cgroup file present', async () => {
+    mockFs({
+      '/proc/self': {
+        /** empty directory */
+      },
+    });
+
+    const collector = new OsCgroupMetricsCollector({});
+    expect(await collector.collect()).toEqual({});
+  });
+
+  it('collects default cgroup data', async () => {
+    mockFs({
+      '/proc/self/cgroup': `
+123:memory:/groupname
+123:cpu:/groupname
+123:cpuacct:/groupname
+      `,
+      '/sys/fs/cgroup/cpuacct/groupname/cpuacct.usage': '111',
+      '/sys/fs/cgroup/cpu/groupname/cpu.cfs_period_us': '222',
+      '/sys/fs/cgroup/cpu/groupname/cpu.cfs_quota_us': '333',
+      '/sys/fs/cgroup/cpu/groupname/cpu.stat': `
+nr_periods 444
+nr_throttled 555
+throttled_time 666
+      `,
+    });
+
+    const collector = new OsCgroupMetricsCollector({});
+    expect(await collector.collect()).toMatchInlineSnapshot(`
+      Object {
+        "cpu": Object {
+          "cfs_period_micros": 222,
+          "cfs_quota_micros": 333,
+          "control_group": "/groupname",
+          "stat": Object {
+            "number_of_elapsed_periods": 444,
+            "number_of_times_throttled": 555,
+            "time_throttled_nanos": 666,
+          },
+        },
+        "cpuacct": Object {
+          "control_group": "/groupname",
+          "usage_nanos": 111,
+        },
+      }
+    `);
+  });
+
+  it('collects override cgroup data', async () => {
+    mockFs({
+      '/proc/self/cgroup': `
+123:memory:/groupname
+123:cpu:/groupname
+123:cpuacct:/groupname
+      `,
+      '/sys/fs/cgroup/cpuacct/xxcustomcpuacctxx/cpuacct.usage': '111',
+      '/sys/fs/cgroup/cpu/xxcustomcpuxx/cpu.cfs_period_us': '222',
+      '/sys/fs/cgroup/cpu/xxcustomcpuxx/cpu.cfs_quota_us': '333',
+      '/sys/fs/cgroup/cpu/xxcustomcpuxx/cpu.stat': `
+nr_periods 444
+nr_throttled 555
+throttled_time 666
+      `,
+    });
+
+    const collector = new OsCgroupMetricsCollector({
+      cpuAcctPath: 'xxcustomcpuacctxx',
+      cpuPath: 'xxcustomcpuxx',
+    });
+    expect(await collector.collect()).toMatchInlineSnapshot(`
+      Object {
+        "cpu": Object {
+          "cfs_period_micros": 222,
+          "cfs_quota_micros": 333,
+          "control_group": "xxcustomcpuxx",
+          "stat": Object {
+            "number_of_elapsed_periods": 444,
+            "number_of_times_throttled": 555,
+            "time_throttled_nanos": 666,
+          },
+        },
+        "cpuacct": Object {
+          "control_group": "xxcustomcpuacctxx",
+          "usage_nanos": 111,
+        },
+      }
+    `);
+  });
+});