Remove nsa statsd integration (replaced by OpenTelemetry) (#30240)

config/initializers/statsd.rb

@@ -1,19 +0,0 @@
-# frozen_string_literal: true
-
-if ENV['STATSD_ADDR'].present?
-  host, port = ENV['STATSD_ADDR'].split(':')
-
-  begin
-    statsd = Statsd.new(host, port)
-    statsd.namespace = ENV.fetch('STATSD_NAMESPACE') { ['Mastodon', Rails.env].join('.') }
-
-    NSA.inform_statsd(statsd) do |informant|
-      informant.collect(:action_controller, :web)
-      informant.collect(:active_record, :db)
-      informant.collect(:active_support_cache, :cache)
-      informant.collect(:sidekiq, :sidekiq) if ENV['STATSD_SIDEKIQ'] == 'true'
-    end
-  rescue
-    Rails.logger.warn("statsd address #{ENV['STATSD_ADDR']} not reachable, proceeding without statsd")
-  end
-end