Fix alertmanager metrics Describe() ordering #3421
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What this PR does:
Some time ago I encountered a weird bug causing not all metrics to be exposed because the order of metrics in
Collect()andDescribe()was not the same. Starting that time, I've always made sure they're sorted the same way, but while reviewing the PR #3388 I've noticed the alertmanager metrics are not sorted correctly, so I'm fixing it in this PR.Which issue(s) this PR fixes:
N/A
Checklist
CHANGELOG.mdupdated - the order of entries should be[CHANGE],[FEATURE],[ENHANCEMENT],[BUGFIX]