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Add Prometheus observability of last signed height per validator #3773
We'd like to observe individual last signed height for validators via Prometheus by requesting a tendermint_consensus_last_signed_height metric with the following labels:
As some might object to the cardinality of this (100+ validators on cosmoshub-2), a config option to enable this could be beneficial as well. Request is related to per-validator voting power in #3083, so a common toggle for per-validator observability would be suitable.
Thanks for your consideration. :-)
On second thought, would be messy to have both Tendermint and cosmos-sdk endpoints for Prometheus. I suspect cosmos-sdk is doing all the Prometheus-related work today, so if that it the case it might make better sense to do it from there. @jackzampolin any thoughts?