Add metrics events for incoming emails

This lets us track how many incoming emails a GitLab instance is processing, by
email type (handler) and by project (where applicable).

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/gitlab/email/receiver.rb b/lib/gitlab/email/receiver.rb
index ec0529b5a4b..bb4fdd1f1f4 100644
--- a/lib/gitlab/email/receiver.rb
+++ b/lib/gitlab/email/receiver.rb
@@ -32,6 +32,10 @@ module Gitlab
 
         raise UnknownIncomingEmail unless handler
 
+        Gitlab::Metrics.add_event(:receive_email,
+                                  project: handler.try(:project),
+                                  handler: handler.class.name)
+
         handler.execute
       end