Allow exporting metrics with resource gae_instance.

[imccarten1]

No description provided.

[codecov-io]

Codecov Report

Merging #253 into master will decrease coverage by 0.08%.
The diff coverage is 82.6%.

@@            Coverage Diff             @@
##           master     #253      +/-   ##
==========================================
- Coverage   72.11%   72.02%   -0.09%     
==========================================
  Files          14       17       +3     
  Lines        1646     1691      +45     
==========================================
+ Hits         1187     1218      +31     
- Misses        383      397      +14     
  Partials       76       76

Impacted Files	Coverage Δ
monitoredresource/aws/aws_identity_doc_utils.go	0% <ø> (ø)
monitoredresource/gcp/gcp_metadata_config.go	0% <ø> (ø)
monitoredresource/monitored_resources.go	0% <0%> (-76.25%)	⬇️
monitoredresource/deprecated.go	100% <100%> (ø)
resource.go	100% <100%> (ø)	⬆️
monitoredresource/aws/monitored_resources.go	68.18% <68.18%> (ø)
monitoredresource/gcp/monitored_resources.go	87.03% <87.03%> (ø)

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[rghetia]

It looks good. However, can you please update resource tests in metrics_proto_api_test.go by updating
in.txt (for input) and out.txt (expected mapping) in folder

Resources
ResourcesWithMissingFields

[rghetia]

@imccarten1 can you please also resolve the conflicts (due to #252)?

[imccarten1]

I've resolved the conflicts and added gae_instance tests to the testdata in and out files.

[msuterski]

Thanks for adding the GAE support!

I was wondering when this will get published? It's something I'm looking for for our GAE apps.