Merge branch 'sc1-rm-application-limiter-ff' into 'master'

Introduce histogram for ApplicationRateLimiter

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/171382



Merged-by: Sincheol (David) Kim <dkim@gitlab.com>
Approved-by: Donna Alexandra <dhutchinson@gitlab.com>
Approved-by: Fred de Gier <fdegier@gitlab.com>
Approved-by: Sincheol (David) Kim <dkim@gitlab.com>
Co-authored-by: Sylvester Chin <schin@gitlab.com>