# File src/ruby_supportlib/phusion_passenger/vendor/union_station_hooks_core/lib/union_station_hooks_core/log.rb, line 48
    def self.debug(message)
      if @@debugging
        if @@debug_callback
          @@debug_callback.call(message)
        else
          STDERR.puts("[UnionStationHooks] #{message}")
        end
      end
    end