Expose init offset and schedule metrics for ConsumerGroup reconciler

[pierDipi]

These 2 metrics will allow monitoring the reconciler main actions that are sometimes slow.

Proposed Changes

• Expose init offset and schedule metrics for ConsumerGroup reconciler

Release Note

Docs

[codecov]

Codecov Report

Merging #3294 (da76e75) into main (c402ae9) will increase coverage by 0.08%.
Report is 2 commits behind head on main.
The diff coverage is 83.33%.

@@             Coverage Diff              @@
##               main    #3294      +/-   ##
============================================
+ Coverage     61.78%   61.87%   +0.08%     
- Complexity      764      766       +2     
============================================
  Files           181      181              
  Lines         12220    12266      +46     
  Branches        266      266              
============================================
+ Hits           7550     7589      +39     
- Misses         4081     4085       +4     
- Partials        589      592       +3     

Flag	Coverage Δ
java-unittests	71.74% <ø> (+0.22%)	⬆️

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

Files Changed	Coverage Δ
.../pkg/reconciler/consumergroup/autoscaler_config.go	0.00% <0.00%> (ø)
...lane/pkg/reconciler/consumergroup/consumergroup.go	55.20% <82.75%> (+2.46%)	⬆️
control-plane/pkg/reconciler/consumergroup/auth.go	74.13% <100.00%> (ø)
...trol-plane/pkg/reconciler/consumergroup/evictor.go	76.92% <100.00%> (-7.08%)	⬇️

... and 2 files with indirect coverage changes

[matzew]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: matzew, pierDipi

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• OWNERS [matzew,pierDipi]

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[pierDipi]

/cherry-pick release-1.11

[knative-prow-robot]

@pierDipi: #3294 failed to apply on top of branch "release-1.11":

Applying: Expose init offset and schedule metrics for ConsumerGroup reconciler
Using index info to reconstruct a base tree...
M	control-plane/pkg/reconciler/consumergroup/consumergroup.go
M	go.mod
Falling back to patching base and 3-way merge...
Auto-merging go.mod
CONFLICT (content): Merge conflict in go.mod
Auto-merging control-plane/pkg/reconciler/consumergroup/consumergroup.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Expose init offset and schedule metrics for ConsumerGroup reconciler
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release-1.11

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