Add back inadvertedly deleted call to ObserveKind

[markusthoemmes]

Changes

This got dropped inadvertently by #2248. This adds it back.

[codecov]

Codecov Report

Merging #2282 (da88c1a) into main (d569db3) will increase coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2282      +/-   ##
==========================================
+ Coverage   64.37%   64.44%   +0.07%     
==========================================
  Files         223      223              
  Lines        9608     9608              
==========================================
+ Hits         6185     6192       +7     
+ Misses       3145     3141       -4     
+ Partials      278      275       -3     

Impacted Files	Coverage Δ
.../injection-gen/generators/reconciler_reconciler.go	0.00% <ø> (ø)
controller/controller.go	86.49% <0.00%> (+0.36%)	⬆️
test/gcs/mock/mock.go	93.54% <0.00%> (+3.22%)	⬆️

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[markusthoemmes]

/assign @mattmoor @dprotaso

[mattmoor]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: markusthoemmes, mattmoor

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