add back okcomputer (#510)

Author: miretskydatwit

Gemfile

@@ -75,6 +75,9 @@ gem "jwt"
 # Pagination
 gem "kaminari"
 
+# Server uptime monitoring
+gem "okcomputer"
+
 group :development, :test do
   gem "debug", platforms: %i[ mri windows ], require: "debug/prelude"
   gem "bundler-audit", require: false

config/initializers/okcomputer.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+# https://github.com/jphenow/okcomputer#registering-additional-checks
+#
+# class MyCustomCheck < OKComputer::Check
+#   def call
+#     if rand(10).even?
+#       "Even is great!"
+#     else
+#       mark_failure
+#       "We don't like odd numbers"
+#     end
+#   end
+# end
+
+OkComputer::Registry.register "database", OkComputer::ActiveRecordCheck.new
+OkComputer::Registry.register "cache", OkComputer::CacheCheck.new
+
+OkComputer::Registry.register "app_version", OkComputer::AppVersionCheck.new
+OkComputer::Registry.register "action_mailer", OkComputer::ActionMailerCheck.new
+
+# Run checks in parallel
+OkComputer.check_in_parallel = true
+
+# Log when health checks are run
+OkComputer.logger = Rails.logger

config/initializers/rack_attack.rb

@@ -15,7 +15,7 @@ class Rack::Attack
   end
 
   safelist("allow-healthchecks") do |req|
-    req.path.start_with?("/up", "/healthchecks")
+    req.path.start_with?("/up", "/healthchecks", "/okcomputer")
   end
 
   # Admins and users with the bypass flag skip per-user API limits

config/routes.rb

@@ -213,5 +213,7 @@
     mount LetterOpenerWeb::Engine, at: "/letter_opener"
   end
 
+  mount OkComputer::Engine, at: "/healthchecks"
+
   root to: "home#index"
 end