extract_metadata

# File activesupport/lib/active_support/messages/metadata.rb, line 39
          def extract_metadata(message)
            data = JSON.decode(message) rescue nil

            if data.is_a?(Hash) && data.key?("_rails")
              new(decode(data["_rails"]["message"]), data["_rails"]["exp"], data["_rails"]["pur"])
            else
              new(message)
            end
          end