Commit e4fb1621 authored by Committed by Pawel Chojnacki
Initial pass at prometheus monitoring.
This is a step for #29118. Add a single metric to count successful logins. Summary types are not supported so remove Collector. Either we need to support the summary type or we need to create a multiprocess-friendly Collector. Add config to load prometheus and set up the Collector and the Exporter. Fix `Gemfile` as current prometheus-client gemspec is missing the `mmap2` dependency.
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