Instrument backfill
- add StepProfiler to libcommon.state, to be able to profile the code duration when doing a backfill
- refactor code to manage prometheus from libcommon
- detail: don't put empty (0) values in cache and queue metrics if the metrics database is empty. it's ok not to have values until the background metrics job has run
Instrument backfill: - add StepProfiler to libcommon.state, to be able to profile the code duration when doing a backfill
- refactor code to manage prometheus from libcommon
- detail: don't put empty (0) values in cache and queue metrics if the metrics database is empty. it's ok not to have values until the background metrics job has run