[esafak]

I know something is going to happen if disk space runs out; I don't need to experience it first.

[stackskipton]

Sure, but for every alert, there is exception.

ElasticSearch for example can be configured using ILM policies to fill up the disk then start deleting old records. I don't need to be woken up for disk filling up on those nodes.

Even worse is CPU/RAM alerts.

[esafak]

Alerts are for when things don't go as expected. You set up log rotation but an agent quietly breaks it or ES introduces a bug in it.

[ajanuary]

The number of times I've had to explain how the JVM heap works...