[release-1.11] Documentation update, health rules polishing

[openshift-cherrypick-robot]

This is an automated cherry-pick of #2389

/assign jotak

[openshift-ci]

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[openshift-ci]

Hi @openshift-cherrypick-robot. Thanks for your PR.

I'm waiting for a netobserv member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[codecov]

Codecov Report

❌ Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.90%. Comparing base (bba6e99) to head (3fb5e02).
⚠️ Report is 3 commits behind head on release-1.11.

Files with missing lines	Patch %	Lines
internal/pkg/metrics/alerts/alerts.go	33.33%	2 Missing ⚠️
...lector/v1beta2/flowcollector_validation_webhook.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.11    #2400   +/-   ##
=============================================
  Coverage         71.89%   71.90%           
=============================================
  Files                93       93           
  Lines             10501    10501           
=============================================
+ Hits               7550     7551    +1     
+ Misses             2471     2470    -1     
  Partials            480      480           

Flag	Coverage Δ
unittests	71.90% <62.50%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...flowcollector/v1beta2/flowcollector_alert_types.go	97.59% <100.00%> (ø)
api/flowcollector/v1beta2/flowcollector_types.go	100.00% <ø> (ø)
internal/pkg/metrics/alerts/builder.go	78.40% <100.00%> (ø)
...lector/v1beta2/flowcollector_validation_webhook.go	72.29% <50.00%> (ø)
internal/pkg/metrics/alerts/alerts.go	87.05% <33.33%> (ø)

... and 2 files with indirect coverage changes

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