Review and enhance metric support for frontend (Go)

[cartersocha]

The following are requirements for metrics in the project. Not all services will meet all requirements.

• Service metrics should not be duplicative of trace-derived metrics.
• Services should emit multiple business metrics where appropriate.
• Services should emit trace exemplars for their metrics.
• Services should use push metrics where possible.
• Services should explicitly read baggage where needed.
• Collectors should perform metric transforms to normalize resource and service metrics.

Referencing issue: #43

[fatsheep9146]

hi, I want to help with this, can you assign this to me? @cartersocha

[cartersocha]

@fatsheep9146 🚀

[fatsheep9146]

It seems that this issue is auto closed by #160? I think it is still needed to be open. @cartersocha

[cartersocha]

I think pr merges close referenced issues by default. It’s a bit annoying. Thanks for calling this out & for starting the metrics work