Instrument the generation of Action Mailer messages

The processing of outbound mail is instrumented with the key
`process.action_mailer`. The payload includes the mailer name as well as
the mailer method.

1 files changed, 7 insertions, 0 deletions

diff --git a/actionmailer/lib/action_mailer/log_subscriber.rb b/actionmailer/lib/action_mailer/log_subscriber.rb
index 8467d45986..eb6fb11d81 100644
--- a/actionmailer/lib/action_mailer/log_subscriber.rb
+++ b/actionmailer/lib/action_mailer/log_subscriber.rb
@@ -19,6 +19,13 @@ module ActionMailer
       debug(event.payload[:mail])
     end
 
+    # An email was generated.
+    def process(event)
+      mailer = event.payload[:mailer]
+      action = event.payload[:action]
+      debug("\n#{mailer}##{action}: processed outbound mail in #{event.duration.round(1)}ms")
+    end
+
     # Use the logger configured for ActionMailer::Base
     def logger
       ActionMailer::Base.logger