[8.x] [Streams 🌊] Introduce GroupStreams (#208126)

[simianhacker]

Backport

This will backport the following commits from main to 8.x:

• [Streams 🌊] Introduce GroupStreams (#208126)

Questions ?

Please refer to the Backport tool documentation

\n\n### Questions ?\nPlease refer to the [Backport tool\ndocumentation](https://github.com/sorenlouv/backport)\n\n"}},{"branch":"main","label":"v9.1.0","branchLabelMappingKey":"^v9.1.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com//pull/208126","number":208126,"mergeCommit":{"message":"[Streams 🌊] Introduce GroupStreams (#208126)\n\n## 🍒 Summary\r\n \r\nThis PR adds support to `/api/streams` endpoints for the\r\n`GroupStreamDefinition` type. Group streams are simply a list of member\r\nstreams along with dashboards. An example of the definition looks like:\r\n\r\n```JSON\r\n{\r\n \"name\": \"nginx-logs\",\r\n \"stream\": {\r\n \"grouped\": {\r\n \"description\": \"A collection of streams for Nginx\",\r\n \"members\": [\r\n \"logs\",\r\n \"logs.nginx\"\r\n ]\r\n }\r\n },\r\n \"dashboards\": []\r\n}\r\n```\r\nThe following APIs support `GroupStreamDefinition`:\r\n\r\n- `GET /api/streams`\r\n- `GET /api/streams/{id}`\r\n- `PUT /api/streams/{id}`\r\n- `DELETE /api/streams/{id}`\r\n- `GET /api/streams/{id}/_details`\r\n\r\nThis PR only includes the support to the APIs, I will submit a follow PR\r\nfor the UI.\r\n\r\n---------\r\n\r\nCo-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>\r\nCo-authored-by: Joe Reuter ","sha":"2092c3d4ca2ae917420f992686fc7a704b393ea4"}},{"branch":"8.x","label":"v8.19.0","branchLabelMappingKey":"^v8.19.0$","isSourceBranch":false,"state":"NOT_CREATED"}]}] BACKPORT-->

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: e2e7de0

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
streamsApp	291	294	+3

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
@kbn/streams-schema	230	257	+27

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
streamsApp	283.0KB	283.9KB	+836.0B

Public APIs missing exports

Total count of every type that is part of your API that should be exported but is not. This will cause broken links in the API documentation system. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats exports for more detailed information.

id	before	after	diff
@kbn/streams-schema	2	3	+1

Unknown metric groups

API count

id	before	after	diff
@kbn/streams-schema	231	260	+29