feat: health sidecar

[danielstokes]

Description

Adds health APM support.

TODO:

• Add tests
• Fix Restart policy ¹

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• New feature / enhancement (non-breaking change which adds functionality)
• Security fix
• Bug fix (non-breaking change which fixes an issue)

Checklist:

• Documentation has been updated
• This change requires changes in testing:
  • unit tests
  • E2E tests

Footnotes

1. requires https://github.com/newrelic/k8s-agents-operator/pull/110 before this can work. ↩

[codecov]

Codecov Report

Attention: Patch coverage is 89.20863% with 15 lines in your changes missing coverage. Please review.

Project coverage is 62.71%. Comparing base (dbfec23) to head (ac2ab09).
Report is 17 commits behind head on main.

Files with missing lines	Patch %	Lines
src/apm/health.go	89.20%	10 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #112      +/-   ##
==========================================
+ Coverage   60.25%   62.71%   +2.45%     
==========================================
  Files          21       23       +2     
  Lines        1472     1671     +199     
==========================================
+ Hits          887     1048     +161     
- Misses        519      548      +29     
- Partials       66       75       +9     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

---

🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests

[mvicknr]

Suggested change

	envHealthFleetControlFile = "NEW_RELIC_FLEET_CONTROL_HEALTH_FILE"
	envHealthFleetControlFilePath = "NEW_RELIC_FLEET_CONTROL_HEALTH_PATH"

@danielstokes We needed to rename this env var since we will have multiple health files in some cases like Python