added mention created logging statement

app/models/mention.rb

@@ -13,6 +13,7 @@ class Mention < ActiveRecord::Base
   after_destroy :delete_notification
 
   def notify_recipient
+    Rails.logger.info "event=mention_sent id=#{self.id} to=#{person.diaspora_handle} from=#{post.person.diaspora_handle}"
     Notification.notify(person.owner, self, post.person) unless person.remote?
   end