mastodon/config/initializers/statsd.rb

# frozen_string_literal: true

if ENV['STATSD_ADDR'].present?
  host, port = ENV['STATSD_ADDR'].split(':')

  statsd = ::Statsd.new(host, port)
  statsd.namespace = ['Mastodon', Rails.env].join('.')

  ::NSA.inform_statsd(statsd) do |informant|
    informant.collect(:action_controller, :web)
    informant.collect(:active_record, :db)
    informant.collect(:cache, :cache)
    informant.collect(:sidekiq, :sidekiq)
  end
end