{file,packet,winlog}beat - Register input metrics diagnostic hook

[andrewkroh]

What does this PR do?

Register an elastic-agent diagnostics hook to return the input metrics (encoded to JSON) in agent diagnostic dumps.

Why is it important?

Have this data included in Agent diagnostics will help in understanding what's happening with the inputs.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Author's Notes

I haven't tested this under Agent. I will likely want to backport this to 8.8.x after testing everything in the 8.9.0-SNAPSHOT when it's available.

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @andrewkroh? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[elasticmachine]

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• Start Time: 2023-06-30T12:37:40.290+0000

• Duration: 82 min 50 sec

Test stats 🧪

Test	Results
Failed	0
Passed	27493
Skipped	2023
Total	29516

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[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[elasticmachine]

Pinging @elastic/elastic-agent-data-plane (Team:Elastic-Agent-Data-Plane)

[andrewkroh]

/test

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b feature/agent-input-metric-diag-hook upstream/feature/agent-input-metric-diag-hook
git merge upstream/main
git push upstream feature/agent-input-metric-diag-hook

[andrewkroh]

We always put the error in the main log message:

Let's use the thread in #35658 (comment) to discuss this. The same topic is blocking that PR.

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b feature/agent-input-metric-diag-hook upstream/feature/agent-input-metric-diag-hook
git merge upstream/main
git push upstream feature/agent-input-metric-diag-hook