require 'prometheus/client' Prometheus::Client.configure do |config| config.logger = Rails.logger config.initial_mmap_file_size = 4 * 1024 config.multiprocess_files_dir = ENV['prometheus_multiproc_dir'] if Rails.env.development? && Rails.env.test? config.multiprocess_files_dir ||= Rails.root.join('tmp/prometheus_multiproc_dir') end end