Expose prometheus HELP information

[jpinsonneau]

Description

Expose prometheus HELP information to FlowMetric API.
Also set defaults for auto generated metrics.

Dependencies

netobserv/flowlogs-pipeline#1107

Checklist

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• Is this PR backed with a JIRA ticket? If so, make sure it is written as a title prefix (in general, PRs affecting the NetObserv/Network Observability product should be backed with a JIRA ticket - especially if they bring user facing changes).
• Does this PR require product documentation?
  • If so, make sure the JIRA epic is labeled with "documentation" and provides a description relevant for doc writers, such as use cases or scenarios. Any required step to activate or configure the feature should be documented there, such as new CRD knobs.
• Does this PR require a product release notes entry?
  • If so, fill in "Release Note Text" in the JIRA.
• Is there anything else the QE team should know before testing? E.g: configuration changes, environment setup, etc.
  • If so, make sure it is described in the JIRA ticket.
• QE requirements (check 1 from the list):
  • Standard QE validation, with pre-merge tests unless stated otherwise.
  • Regression tests only (e.g. refactoring with no user-facing change).
  • No QE (e.g. trivial change with high reviewer's confidence, or per agreement with the QE team).

[openshift-ci]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.66%. Comparing base (8b503cc) to head (29bdfea).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2060      +/-   ##
==========================================
+ Coverage   71.48%   71.66%   +0.18%     
==========================================
  Files          80       80              
  Lines       10653    10665      +12     
==========================================
+ Hits         7615     7643      +28     
+ Misses       2634     2623      -11     
+ Partials      404      399       -5     

Flag	Coverage Δ
unittests	71.66% <100.00%> (+0.18%)	⬆️

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

Files with missing lines	Coverage Δ
api/flowmetrics/v1alpha1/flowmetric_types.go	100.00% <ø> (ø)
internal/controller/flp/flp_pipeline_builder.go	74.05% <100.00%> (+0.04%)	⬆️
internal/pkg/helper/otel/otel_config.go	86.02% <100.00%> (+0.15%)	⬆️
internal/pkg/metrics/predefined_metrics.go	97.76% <100.00%> (+0.08%)	⬆️

... and 4 files with indirect coverage changes

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[jotak]

/lgtm