The number of messages that Amazon SNS failed to deliver.
For Amazon SQS, email, SMS, or mobile push endpoints, the metric increments by 1 when Amazon
SNS stops attempting message deliveries. For HTTP or HTTPS endpoints, the metric includes
every failed delivery attempt, including retries that follow the initial attempt. For all
other endpoints, the count increases by 1 when the message fails to deliver (regardless of
the number of attempts).
This metric does not include messages that were rejected by subscription filter policies.
The number of messages that Amazon SNS failed to deliver.
For Amazon SQS, email, SMS, or mobile push endpoints, the metric increments by 1 when Amazon SNS stops attempting message deliveries. For HTTP or HTTPS endpoints, the metric includes every failed delivery attempt, including retries that follow the initial attempt. For all other endpoints, the count increases by 1 when the message fails to deliver (regardless of the number of attempts).
This metric does not include messages that were rejected by subscription filter policies.
Units: Count
Valid Statistics: Sum, Average