Hi folks
There’s a throwaway line in the docs for idelta (https://prometheus.io/docs/prometheus/latest/querying/functions/#idelta) which says…
ideltashould only be used with gauges.
My question is (and forgive me if this is naive) why, exactly? From playing around with it, it seems to do exactly what I want it do for a counter of mine. I haven’t observed any problems with it personally.
What problems can this actually cause?