Add new alerts for HA tracker and ingester #12084
Draft
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What this PR does
Add alerts to monitor HA tracker elected replica changes and samples discarded from ingesters which could be helpful to detect problems with HA tracker.
Not updating the runbook yet until we're sure we want these.
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]
. If changelog entry is not needed, please add thechangelog-not-needed
label to the PR.about-versioning.md
updated with experimental features.