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It's still a problem even if it's not the internal monitoring system. Customers use CloudWatch to detect problems with DynamoDB and get notified. This dependency means customers may not get notified if CloudWatch does not work as expected due to a DynamoDB problem.

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There are different forces at play.

On one hand, one can design a service with minimum dependencies to survive other services' outages, but that means duplication of effort and increased cost, as well as slower delivery of features. Or one can focus on adding value.

It seems though, from the update, that CloudWatch is going to have some sort of caching for most recent data.

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