Merge branch 'es_instrumenting' into 'master'

ES instrumenting

/cc @pcarranza 

See merge request !638

CHANGELOG-EE

@@ -5,6 +5,7 @@ v 8.11.0 (unreleased)
   - Change LdapGroupSyncWorker to use new LDAP group sync classes
   - [Elastic][Fix] Commit search breaks for some URLs on gitlab-ce project
   - Removed unused GitLab GEO database index
+  - Enable monitoring for ES classes
 
 v 8.10.5
   - Used cached value of project count in `Elastic::RepositoriesSearch` to reduce DB load. !637

config/initializers/metrics.rb

@@ -148,6 +148,20 @@ if Gitlab::Metrics.enabled?
 
     config.instrument_methods(Gitlab::Highlight)
     config.instrument_instance_methods(Gitlab::Highlight)
+
+    config.instrument_instance_methods(Search::GlobalService)
+    config.instrument_instance_methods(Search::ProjectService)
+    config.instrument_instance_methods(Gitlab::Elastic::SearchResults)
+    config.instrument_instance_methods(Gitlab::Elastic::ProjectSearchResults)
+    config.instrument_instance_methods(Elastic::ApplicationSearch)
+    config.instrument_instance_methods(Elastic::IssuesSearch)
+    config.instrument_instance_methods(Elastic::MergeRequestsSearch)
+    config.instrument_instance_methods(Elastic::MilestonesSearch)
+    config.instrument_instance_methods(Elastic::NotesSearch)
+    config.instrument_instance_methods(Elastic::ProjectsSearch)
+    config.instrument_instance_methods(Elastic::RepositoriesSearch)
+    config.instrument_instance_methods(Elastic::SnippetsSearch)
+    config.instrument_instance_methods(Elastic::WikiRepositoriesSearch)
   end
 
   GC::Profiler.enable