Intregration test for metrics

[khrm]

Request

We require integration integration tests for metrics also. For now, metrics is experimental but if we want to move ahead, then a test which can captures issue happening in metrics is must.

/kind testing
/kind test

[khrm]

A recent pr by myself was working fine in some of the conditions I test but later on I found that it introduces race condition for some metrics and metrics stuck. I resolved that.

[vdemeester]

/area testing

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[jerop]

/lifecycle frozen

we need fix this to catch the issues we've been seeing with metrics

needed before v1 (@lbernick)