SDK: implement metrics when OTEPs are approved

[fbogsany]

See #80 for API side of this.

[fbogsany]

open-telemetry/opentelemetry-specification#259 metrics SDK spec moved to Alpha 0.3.

[fbogsany]

open-telemetry/opentelemetry-specification#347

[genebean]

What's the status of this?

[ioquatix]

I'm also interested in this :) it would be amazing!

[fbogsany]

The spec is currently in “Feature Freeze” state, but is still considered Experimental. We may be able to proceed with the API, but the SDK spec is still WIP.

[beanieboi]

as of open-telemetry/opentelemetry-specification#2104 the Metrics API moved to stable.

[fbogsany]

As of #1004 we implemented an initial version of the Metrics API 😛

[fbogsany]

Note that this issue is about the SDK rather than the API. The SDK spec for metrics is in "feature freeze" and we're starting the implementation in #1108.

[SauravPahadia]

Any update on the implementation status? We'd love to track metrics for our ruby app.

[fbogsany]

#1108 is continuing in fits & starts. I suggest following that PR for status updates.

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