Fix cortex_ingester_ingested_exemplars_failures_total metric tracking when exemplars are discarded because OOO #7948
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What this PR does
#7640 introduced a little regression: the metric
cortex_ingester_ingested_exemplars_failures_total
is not tracked anymore for exemplars discarded because OOO. This is misleading, because looking at the sum of successfully + failed ingested exemplars, you don't actually get the total number of exemplars processed. In this PR I fix it reverting back to the previous behaviour, and improving unit tests.Which issue(s) this PR fixes or relates to
N/A
Checklist
CHANGELOG.md
updated - the order of entries should be[CHANGE]
,[FEATURE]
,[ENHANCEMENT]
,[BUGFIX]
.about-versioning.md
updated with experimental features.