Add CSM Support

[iann0036]

Port the v1 SDK's client side metric (CSM) client support for reporting metrics.

aws/csm aws/aws-sdk-go#2677 aws/aws-sdk-go#2678

[securisec]

Bump on this

[jasdel]

Thanks for reaching out @iann0036, it would be great to hear your use case for the CSM feature, and more details about how you are using the feature within your application's stack.

[securisec]

@jasdel , I can share my use case here. From a security perspective, CSM helps me understand what an application is trying to do during dev and testing (which leads to better IAM policies), instead of relying on api call log parsing post deployment.

[iann0036]

@jasdel It relates to CSM usage within https://github.com/iann0036/iamlive

[danpilch]

+1 for CSM, we use it for figuring out what permissions are required whilst in development.

[guseggert]

It would also be nice if the code were written with a pluggable metrics sink, so that we can reuse the same metrics with backends other than the CloudWatch agent (something that v1 doesn't support AFAIK).

[lucix-aws]

It would also be nice if the code were written with a pluggable metrics sink

This is the route we intend to go leveraging https://github.com/aws/smithy-go/issues/470.

#1744 covers this more generally, going to close this one and cross-link.

[github-actions[bot]]

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