feat(operator): Add alert for discarded samples - #13512
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What this PR does / why we need it:
This PR adds an alert to the set of alerts provided by the operator, that fires when there are samples discarded by Loki during ingestion. It should only alert on non-retryable errors.
Which issue(s) this PR fixes:
Fixes LOG-5731
Special notes for your reviewer:
The threshold for alerting is currently set to "zero". This means that the alert will fire if any samples are discarded. I don't think we can do an alerting based on percentage here (because I do not see a metric for "accepted samples") or if it makes any sense.
I'm looking into extending the unit-tests we have for alerts to also cover this alert.
Checklist
CONTRIBUTING.mdguide (required)