Improve runbook for MimirRequestErrors, Alertmanager section, for alertmanager distributor problems #5694
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What this PR does
The alertmanager's distributor fans out tenant requests to the correct alertmanager. There is a specific state where this may be failing, but it's not immediately obvious from the alert.
Add a couple lines to the Alertmanager section of the
MimirRequestErrors
runbook which handle this case, and describe what to do.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]