[WIP][POC] Passively listen to active job errors. This shouldn't disrupt the normal retry_on/discard_on flow. It allows a hook for you to observe errors.

active_job_listening_to_errors.rb

module ActiveJobListeningToErrors
  extend ActiveSupport::Concern

  module ClassMethods
    def on_error(error_class)
      around_perform do |job, perform_block|
        perform_block.call
      rescue error_class => error
        yield job, error
        raise
      end
    end
  end
end