During an early SkyeEngine Fabric security soak, four of the five coordinators exited after their certificate caches expired. The analysis tool later told me that resource growth looked excellent.
Technically, it was correct. Dead processes are wonderfully stable.
The tool was measuring the slope without first checking that every expected process had supplied samples for the whole test. I fixed the gate so it checks coverage, liveness and restart counts before looking at memory or file-descriptor growth.
I now use the same check elsewhere. Missing metrics, skipped corpus categories and a benchmark client which stopped doing any work can all produce beautifully calm graphs.