Alerting on average % utilisation across all disks is of limited use (for me), as it allows one filesystem to hit 100% as long as the average stays below the trigger limit - essentially it means I still need to use an external service for alerting.
If the current mechanism is useful for some users then it would be good to have both types as options, but I think there are very few use cases where alert on average is better than fullest...
Noted for future consideration.
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