Remove puma worker killer (#1575)

Gemfile

@@ -66,7 +66,6 @@ gem "pg", "~> 1.1"
 gem "pry", "~> 0.12"
 gem "pry-rails", "~> 0.3"
 gem "puma", "~> 3.12"
-gem "puma_worker_killer", "~> 0.1"
 gem "pundit", "~> 2.0"
 gem "pusher", "~> 1.3"
 gem "pusher-push-notifications", "~> 1.0"

Gemfile.lock

@@ -634,9 +634,6 @@ GEM
       pry (>= 0.10.4)
     public_suffix (3.0.3)
     puma (3.12.0)
-    puma_worker_killer (0.1.0)
-      get_process_mem (~> 0.2)
-      puma (>= 2.7, < 4)
     pundit (2.0.0)
       activesupport (>= 3.0.0)
     pundit-matchers (1.6.0)
@@ -994,7 +991,6 @@ DEPENDENCIES
   pry-byebug (~> 3.6)
   pry-rails (~> 0.3)
   puma (~> 3.12)
-  puma_worker_killer (~> 0.1)
   pundit (~> 2.0)
   pundit-matchers (~> 1.6)
   pusher (~> 1.3)

config/puma.rb

@@ -16,8 +16,3 @@ on_worker_boot do
   # See: https://devcenter.heroku.com/articles/deploying-rails-applications-with-the-puma-web-server#on-worker-boot
   ActiveRecord::Base.establish_connection
 end
-
-before_fork do
-  require "puma_worker_killer"
-  PumaWorkerKiller.enable_rolling_restart(12 * 3600) # 12 hours in seconds
-end