OTLP gRPC metrics exporter fails to connect

[ahadnagy]

Hi,

I was trying to use the metrics gRPC exporter, but I can't seem to get it to work.

I'm getting a connection error:

[Error] File: [OMITTED]/opentelemetry-cpp-src/exporters/otlp/src/otlp_grpc_metric_exporter.cc:151[OTLP METRIC GRPC Exporter] Export() failed: failed to connect to all addresses

The collector service is running, and I'm able to export traces with the same setup. Similarly, I'm able to export metrics using the OTLP HTTP exporter.

Is there anything else that's needed to get the gRPC exporter working, or this is bug?

[lalitb]

@ahadnagy - Have added the OTLP gRPC example in PR #1598. The metrics export should work using new version of Collector.