Gitlab::Checks is now instrumented

So we have a detailed view of what checks perform bad

CHANGELOG

@@ -97,6 +97,7 @@ v 8.12.0 (unreleased)
   - Fix spacing and vertical alignment on build status icon on commits page (ClemMakesApps)
   - Update merge_requests.md with a simpler way to check out a merge request. !5944
   - Fix button missing type (ClemMakesApps)
+  - Gitlab::Checks is now instrumented
   - Move to project dropdown with infinite scroll for better performance
   - Fix leaking of submit buttons outside the width of a main container !18731 (originally by @pavelloz)
   - Load branches asynchronously in Cherry Pick and Revert dialogs.

config/initializers/metrics.rb

@@ -68,7 +68,8 @@ if Gitlab::Metrics.enabled?
       ['app', 'mailers', 'emails']          => ['app', 'mailers'],
       ['app', 'services', '**']             => ['app', 'services'],
       ['lib', 'gitlab', 'diff']             => ['lib'],
-      ['lib', 'gitlab', 'email', 'message'] => ['lib']
+      ['lib', 'gitlab', 'email', 'message'] => ['lib'],
+      ['lib', 'gitlab', 'checks']           => ['lib']
     }
 
     paths_to_instrument.each do |(path, prefix)|