resource autodetection

[mwear]

It would be nice to have resource auto-detection, similar to what exists in opentelemetry-js. The logic was largely ported from OpenCensus Node:

open-telemetry/opentelemetry-js#899

There is little to no specification for it at this time, there is a related issue:
open-telemetry/opentelemetry-specification#535

[fbogsany]

@robertlaurin can you please comment here so I can assign this one to you? 😄

[robertlaurin]

Hey 👋, I'm going to work on this :)

[fbogsany]

I referenced the OpenTelemetry Collector's implementation of resource auto-discovery on today's SIG call. Turns out it's a little more Kubernetes-specific (and much more complicated) than I thought: https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/master/processor/k8sprocessor. I'm not sure how much we can usefully extract from it.

[fbogsany]

Do we consider this fixed by #263 or do we want to leave this open to add resource detection for platforms other than GCP?