fix(metrics): flush upon a single metric 100th data point

[knightjoel]

Description of changes:

Issue: #1062

Per the EMF spec, metric value arrays must not have more than 100 elements. This PR ensures that metrics are serialized when a single metric collects 100 values in addition to the existing behavior of serializing when 100 metrics are collected.

Note: as far as I can see, this same change needs to be brought to the other Powertools languages as well. I'm not equipped nor have the skill to submit a PR for any language other than Python.

Checklist

• Meet tenets criteria
• Update tests
• Update docs
• PR title follows conventional commit semantics

Breaking change checklist

RFC issue #:

• Migration process documented
• Implement warnings (if it can live side by side)

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[boring-cyborg]

Thanks a lot for your first contribution! Please check out our contributing guidelines and don't hesitate to ask whatever you need.

[heitorlessa]

cc @pankajagrawal16 @saragerion @flochaz - this is the bug we discussed on metric data points having a maximum of 100.

[heitorlessa]

@jaredcnance thanks again for confirming this in the spec. Next release will have this fix on Lambda Powertools for Python.

and thank you very much @jonemo for spotting as well as fixing it. I didn't create an issue because it's in the Spec we missed

[pankajagrawal16]

cc @pankajagrawal16 @saragerion @flochaz - this is the bug we discussed on metric data points having a maximum of 100.

@heitorlessa Since Powertools for Java internally uses https://github.com/awslabs/aws-embedded-metrics-java, this is fixed already in the lib as part of this issue via this PR. Let me know if I am missing something still that was fixed as part of this change. As far as I can see, Powertools for Java is covered.

[dreamorosi]

@heitorlessa thanks for flagging this (@saragerion reached out to me).

TypeScript also uses the AWS EMF library but I am not sure if that's handled by the library or if we should implement the behaviour described in @pankajagrawal16's issue.

I've opened an issue on TypeScript's side to track the effort to investigate & potentially implement a fix/document the limit.

EDIT: we don't use the EMF library so we might need to implement it

[boring-cyborg]

Awesome work, congrats on your first merged pull request and thank you for helping improve everyone's experience!