A systemd unit enabled and running for five years, consuming a gigabyte, serving a feature that was removed in 2021. Nothing alerts on a service that is working…
An inventory of what is configured, compared against an inventory of what is actually listening. Scanning your own address space is a thing that feels excessive until it…
A rule that had not fired since it was created, deleted on the grounds that a silent alert is untested rather than reassuring. A rule that never fires…
Monitoring the renewal job answers whether it ran; monitoring the certificate answers whether it worked. The check runs from outside and depends on none of the machinery that…
One label on a histogram, and a p95 that had been describing nobody. An aggregate percentile is a weighted average of populations that may have nothing in common,…