Explicitly require prometheus/record during initialization

config/initializers/prometheus.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require 'code_ocean/config'
+require 'prometheus/record'
 
 return unless CodeOcean::Config.new(:code_ocean).read[:prometheus_exporter][:enabled] && !defined?(::Rails::Console)
 return if %w[db: assets:].any? {|task| Rake.application.top_level_tasks.to_s.include?(task) }