ingester: Revert stringlabels in performance critial paths #6980
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What this PR does:
After deploying Cortex with the latest Prometheus update #6930, we saw an increase in 5XXs from distributor -> ingesters.
This PR reverts the suspicious change from the PR.
cortexpb.FromLabelAdaptersToLabelsWithCopy()is used in Push() when a new series is created.cortex/pkg/ingester/ingester.go
Line 1349 in a776fe4
Which issue(s) this PR fixes:
Fixes #
Checklist
CHANGELOG.mdupdated - the order of entries should be[CHANGE],[FEATURE],[ENHANCEMENT],[BUGFIX]