instance method discard_on_handler

# File activejob/lib/active_job/exceptions.rb, line 155
        def discard_on_handler(report, block)
          proc do |error|
            instrument :discard, error: error do
              ActiveSupport.error_reporter.report(error, source: "application.active_job") if report
              block.call(self, error) if block
              run_after_discard_procs(error)
            end
          end
        end