add e2e tests, documentation, and changelog entry

.chloggen/pkg-ottl-add-parse-key-value-function.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: pkg/ottl
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add `ParseKeyValue` function for parsing key value pairs from a target string
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [30998]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

pkg/ottl/e2e/e2e_test.go

@@ -437,6 +437,30 @@ func Test_e2e_converters(t *testing.T) {
 				m.PutDouble("id", 1)
 			},
 		},
+		{
+			statement: `set(attributes["test"], ParseKeyValue("k1=v1 k2=v2"))`,
+			want: func(tCtx ottllog.TransformContext) {
+				m := tCtx.GetLogRecord().Attributes().PutEmptyMap("test")
+				m.PutStr("k1", "v1")
+				m.PutStr("k2", "v2")
+			},
+		},
+		{
+			statement: `set(attributes["test"], ParseKeyValue("k1!v1_k2!v2", "!", "_"))`,
+			want: func(tCtx ottllog.TransformContext) {
+				m := tCtx.GetLogRecord().Attributes().PutEmptyMap("test")
+				m.PutStr("k1", "v1")
+				m.PutStr("k2", "v2")
+			},
+		},
+		{
+			statement: `set(attributes["test"], ParseKeyValue("k1!v1_k2!\"v2__!__v2\"", "!", "_"))`,
+			want: func(tCtx ottllog.TransformContext) {
+				m := tCtx.GetLogRecord().Attributes().PutEmptyMap("test")
+				m.PutStr("k1", "v1")
+				m.PutStr("k2", "v2__!__v2")
+			},
+		},
 		{
 			statement: `set(attributes["test"], Seconds(Duration("1m")))`,
 			want: func(tCtx ottllog.TransformContext) {

pkg/ottl/ottlfuncs/README.md

@@ -410,6 +410,7 @@ Available Converters:
 - [Nanoseconds](#nanoseconds)
 - [Now](#now)
 - [ParseJSON](#parsejson)
+- [ParseKeyValue](#parsekeyvalue)
 - [Seconds](#seconds)
 - [SHA1](#sha1)
 - [SHA256](#sha256)
@@ -840,6 +841,26 @@ Examples:
 
 - `ParseJSON(body)`
 
+### ParseKeyValue
+
+`ParseKeyValue(target, Optional[delimiter], Optional[pair_delimiter])`
+
+The `ParseKeyValue` Converter returns a `pcommon.Map` that is a result of parsing the target string for key value pairs.
+
+`target` is a Getter that returns a string. `delimiter` is an optional string that is used to split the key and value in a pair, the default is `=`. `pair_delimiter` is an optional string that is used to split key value pairs, the default is white space.
+
+For example, the following target `"k1=v1 k2=v2 k3=v3"` will use default delimiters and be parsed into the following map:
+```
+{ "k1": "v1", "k2": "v2", "k3": "v3" }
+```
+
+Examples:
+
+- `ParseKeyValue("k1=v1 k2=v2 k3=v3")`
+- `ParseKeyValue("k1!v1_k2!v2_k3!v3", "!", "_")`
+- `ParseKeyValue(attributes["pairs"])`
+
+
 ### Seconds
 
 `Seconds(value)`