Merge branch 'pawel/bump_prometheus_client_library' into 'master'

Fix bug causing truncation of Metrics files

See merge request !13035

Gemfile.lock

@@ -591,7 +591,7 @@ GEM
     premailer-rails (1.9.7)
       actionmailer (>= 3, < 6)
       premailer (~> 1.7, >= 1.7.9)
-    prometheus-client-mmap (0.7.0.beta9)
+    prometheus-client-mmap (0.7.0.beta10)
       mmap2 (~> 2.2, >= 2.2.7)
     pry (0.10.4)
       coderay (~> 1.1.0)

changelogs/unreleased/pawel-fix-metrics-files-handling.yml

+---
+title: Fix bug causing metrics files to be truncated
+merge_request: 35420
+author: