Add logging for rack attack events

changelogs/unreleased/rack_attack_logging.yml

+---
+title: Add logging for rack attack events to production.log
+merge_request: 
+author: 

config/initializers/rack_attack_logging.rb

+# 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