How to instrument specific methods with gRPC OpenTelemetry metrics in Java without global interception?

[ziyoushibo]

I want to use gRPC's OpenTelemetry observability capabilities in Java, specifically only the metrics feature. However, I don't want to use the global interceptor approach shown in the official demo. I only want to add instrumentation to a few specific methods.

Could you please provide a code example showing how to achieve this? I would greatly appreciate any help with implementing method-specific metrics collection instead of global interception.

Thank you very much!

[ejona86]

Metrics is per-channel, so you can configure a specific channel with GrpcOpenTelemetry.configureChannelBuilder(managedChannelBuilder). You can't configure which RPCs have metrics generated, except maybe if it's possible in OpenTelemetry itself to filter certain labels.