Enabling/disabling specific exporters doesn't work

[mat-rumian]

In previous releases (for sure in 0.14.0) I was able to setup only traces exporter (oTLPgRPCSpanExporter) by setting an environment variable: OTEL_EXPORTER=otlp_span. In current release (0.16.1) I was trying do the same by setting OTEL_TRACES_EXPORTER=otlp and OTEL_METRICS_EXPORTER=none but looks like it doesn't work.

An error in the logs:

[opentelemetry.auto.trace 2021-02-14 21:04:35:062 +0000] [grpc-default-executor-6] WARN io.opentelemetry.exporter.otlp.metrics.OtlpGrpcMetricExporter - Failed to export metrics
io.grpc.StatusRuntimeException: UNIMPLEMENTED: unknown service opentelemetry.proto.collector.metrics.v1.MetricsService

[mateuszrzeszutek]

Have you tried using the system property instead (-Dotel.metrics.exporter=none)?

[mat-rumian]

Thanks it works fine, I also checked again environment variables and it came out I made a mistake... I'm sorry. Functionality works fine for both - property and env var.

[mateuszrzeszutek]

Good to hear that - I started worrying that there's some difference in behavior between env vars & system props 😄

[hballangan-mdsol]

Hi! Related to this issue, OTEL_METRICS_EXPORTER is working for 16.1 and has been clarified as a mistake but OTEL_TRACES_EXPORTER=none is not recognized. Only OTEL_METRICS_EXPORTER=none is working for me.