gamma_ex      |      `--> lambda_q <--------------------- lambda_ex <-------------------------+              |                                                                |        OK <--o--> KO --> lambda_on_error_ex --> lambda_on_error_q --> [TTL] --+

old_sound_rabbit_mq:producers:# only here for dead-letter exchange pattern, do not use directlylambda:connection:defaultexchange_options:{name: lambda_ex, type: direct}consumers:lambda:connection:defaultexchange_options:{name: gamma_ex, type: fanout }# or directqueue_options:name:lambda_qarguments:'x-dead-letter-exchange':[S, lambda_on_error_ex]'x-dead-letter-routing-key':[S, '']callback:app.consumer.lambda_consumer# only here for dead-letter exchange pattern, do not use directlylambda_on_error:connection:defaultexchange_options:{name: lambda_on_error_ex, type: direct}queue_options:name:lambda_on_error_qarguments:'x-dead-letter-exchange':[S, lambda_ex]'x-message-ttl':['I', 10000]callback:app.consumer.lambda_consumer# wont be used but the key must be present :/bindings:        -{exchange: lambda_ex, destination: lambda_q}