CloudWatch Events Metrics - DeadLetterInvocations

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The documentation says:

Metric: DeadLetterInvocations
Description:

Measures the number of times a rule’s target is not invoked in response to an event. This includes invocations that would result in triggering the same rule again, causing an infinite loop.

Valid Dimensions: RuleName

Units: Count

Can someone give a simple explanation of what the above description means in layman's terms.

amazon-cloudwatch amazon-sqs
1 Answers

I was also confused about dead letter invocation before, correct explanation:

DeadLetterInvocations: Invocations that are failed temporarily and are being retried by the event rule itself. Only some events, such as those that fail due to a throttling or timeout error, are retried.

InvocationsSentToDlq: Permanently failed invocations sent to SQS DLqueue configured in the target.

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