[Fleet] Allow to overrides agent policy

[nchaulet]

Summary

Resolve #158699

Add a new property overrides to the agent policy API.

We do not allow to override inputs this will throw a 400.

How to test?

• using the PUT /api/fleet/agent_polcies/{id} API add some agent properties inside overrides

Todo

• add manual test instructions
• Add API integration tests

[apmmachine]

🤖 GitHub comments

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[nchaulet]

@cmacknz that new API allow to configure any key of the agent policy in Fleet, I tried to configure the agent.logging.level to debug but the agent seems to still use the default logging level (info) when I run elastic-agent inspect the policy contains my debug log level, is there a known bug/issue for the agent log level that blocked me to configure it that way?

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[nchaulet]

@elasticmachine merge upstream

[juliaElastic]

LGTM, with the condition to find out why the override is not applied on the agent.

[afharo]

SO changes LGTM

[nchaulet]

@juliaElastic @cmacknz I created the following issue for the agent.logging.level: debug overrides not working elastic/elastic-agent#2851

[nchaulet]

@elasticmachine merge upstream

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 9d125a1

Metrics [docs]

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
fleet	1066	1067	+1

Unknown metric groups

API count

id	before	after	diff
fleet	1182	1183	+1

ESLint disabled line counts

id	before	after	diff
enterpriseSearch	13	15	+2
securitySolution	409	413	+4
total			+6

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	14	16	+2
securitySolution	492	496	+4
total			+6

History

• 💔 Build #134786 failed fa23836
• 💛 Build #134348 was flaky 498aebe
• 💔 Build #134114 failed d41b932

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @nchaulet