Add optional StatsD performance tracking

config/application.rb

@@ -30,6 +30,8 @@ module Mastodon
 
     config.active_job.queue_adapter = :sidekiq
 
+    config.middleware.insert(0, 'StatsDMonitor')
+
     config.middleware.insert_before 0, Rack::Cors do
       allow do
         origins  '*'

config/environments/production.rb

@@ -104,4 +104,8 @@ Rails.application.configure do
   config.react.variant = :production
 
   config.active_record.logger = nil
+
+  config.to_prepare do
+    StatsD.backend = StatsD::Instrument::Backends::NullBackend if ENV['STATSD_ADDR'].blank?
+  end
 end

config/initializers/inflections.rb

@@ -10,7 +10,6 @@
 #   inflect.uncountable %w( fish sheep )
 # end
 
-# These inflection rules are supported but not enabled by default:
-# ActiveSupport::Inflector.inflections(:en) do |inflect|
-#   inflect.acronym 'RESTful'
-# end
+ActiveSupport::Inflector.inflections(:en) do |inflect|
+  inflect.acronym 'StatsD'
+end

config/initializers/statsd.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+StatsD.prefix              = 'mastodon'
+StatsD.default_sample_rate = 1
+
+StatsDMonitor.extend(StatsD::Instrument)
+StatsDMonitor.statsd_measure(:call, 'request.duration')
+
+STATSD_REQUEST_METRICS = {
+  'request.status.success'               => 200,
+  'request.status.not_found'             => 404,
+  'request.status.too_many_requests'     => 429,
+  'request.status.internal_server_error' => 500,
+}.freeze
+
+STATSD_REQUEST_METRICS.each do |name, code|
+  StatsDMonitor.statsd_count_if(:call, name) do |status, _env, _body|
+    status.to_i == code
+  end
+end