Add logging for rack attack events

Author: gitlab-brian

changelogs/unreleased/rack_attack_logging.yml

@@ -0,0 +1,4 @@
+---
+title: Add logging for rack attack events to production.log
+merge_request: 
+author: 

config/initializers/rack_attack_logging.rb

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+# Adds logging for all Rack Attack blocks and throttling events.
+
+ActiveSupport::Notifications.subscribe('rack.attack') do |name, start, finish, request_id, req|
+  if [:throttle, :blacklist].include? req.env['rack.attack.match_type']
+    Rails.logger.info("Rack_Attack: #{req.env['rack.attack.match_type']} #{req.ip} #{req.request_method} #{req.fullpath}")
+  end
+end