Currency Service not emitting metrics in k8s

[austinlparker]

Trace export seems to be working, but seeing a lot of this in the logs --

2023-04-16T18:36:36.278175487Z stdout F [Error] File: /opentelemetry-cpp/exporters/otlp/src/otlp_grpc_metric_exporter.cc:74 [OTLP METRIC GRPC Exporter] Export() failed: DNS resolution failed for otelcol:4317: C-ares status is not ARES_SUCCESS qtype=A name=otelcol is_balancer=0: Domain name not found

[kaechele]

Configuration of the OLTP endpoint via environment variables is not yet supported:

opentelemetry-demo/src/currencyservice/src/meter_common.h

Lines 28 to 29 in 5ef82f3

	// Configuration via environment variable not supported yet
	otlpOptions.endpoint = "otelcol:4317";

So as of now it's hardcoded to otelcol:4317.

[puckpuck]

This has been resolved in the currency service with #904