Dead lettering is done on a best effort basis. The same
message might be dead lettered multiple times.
If validation on any of the fields fails at subscription
creation/updation, the create/update subscription request will
fail.
Attributes
Name
Description
dead_letter_topic
str
The name of the topic to which dead letter messages should
be published. Format is
projects/{project}/topics/{topic}.The Cloud Pub/Sub
service account associated with the enclosing subscription's
parent project (i.e.,
service-{project_number}@gcp-sa-pubsub.iam.gserviceaccount.com)
must have permission to Publish() to this topic.
The operation will fail if the topic does not exist. Users
should ensure that there is a subscription attached to this
topic since messages published to a topic with no
subscriptions are lost.
max_delivery_attempts
int
The maximum number of delivery attempts for any message. The
value must be between 5 and 100.
The number of delivery attempts is defined as 1 + (the sum
of number of NACKs and number of times the acknowledgement
deadline has been exceeded for the message).
A NACK is any call to ModifyAckDeadline with a 0 deadline.
Note that client libraries may automatically extend
ack_deadlines.
This field will be honored on a best effort basis.
If this parameter is 0, a default value of 5 is used.