[bug] fix avg_over_time panic when counter series is missing #5300
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What this PR does:
The avg_over_time metrics calculation relies on a pair of series per actual value and in some occurrences, if one of the pair is no longer in the resulting time series, a panic occurs. The fix is to check whether the series exist before doing aggregation.
Which issue(s) this PR fixes:
Fixes #
Checklist
CHANGELOG.md
updated - the order of entries should be[CHANGE]
,[FEATURE]
,[ENHANCEMENT]
,[BUGFIX]