Improve blocked user tracking code readability

app/controllers/application_controller.rb

@@ -24,7 +24,6 @@ class ApplicationController < ActionController::Base
   before_action :configure_permitted_parameters, if: :devise_controller?
   before_action :require_email, unless: :devise_controller?
 
-
   around_action :set_locale
 
   after_action :set_page_title_header, if: -> { request.format == :json }

config/initializers/warden.rb

@@ -40,7 +40,12 @@ Rails.application.configure do |config|
     # multiple times during the request lifecycle. We want to increment
     # metrics and write logs only once in that case.
     #
-    next if (auth.env['warden.auth.trackers'] ||= {}).push(activity).many?
+    # 'warden.auth.trackers' is our custom hash key that follows usual
+    # convention of naming keys in the Rack env hash. If there is more
+    # than one tracker in the hash it means that we have already recorded
+    # an event.
+    #
+    next if (auth.env['warden.auth.trackers'] ||= []).push(activity).many?
 
     if user.blocked?
       activity.user_blocked!

spec/lib/gitlab/auth/blocked_user_tracker_spec.rb

@@ -3,7 +3,7 @@ require 'spec_helper'
 describe Gitlab::Auth::BlockedUserTracker do
   describe '#log_blocked_user_activity!' do
     context 'when user is not blocked' do
-      it 'does not blocked user activity' do
+      it 'does not log blocked user activity' do
         expect_any_instance_of(SystemHooksService)
           .not_to receive(:execute_hooks_for)
         expect(Gitlab::AppLogger).not_to receive(:info)