The use case is to alert on the disk usage deviation from the mean, within
a cluster of hosts. The alert should indicate which host deviates from the
median disk usage.
So this could be written as:
metric format: `disk_usage_pct{cluster=foo, instance=foo01}`
`max(disk_usage_pct) by (cluster) - median(disk_usage_pct) by (cluster)`
This will give the % deviation. But it'll mask the `instance` tag, since
the above aggregate across the `cluster` label.
Is there a way to preserve the `instance` label?
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