Add custom label for per-RPC metrics #12552
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TODO: Add tests
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@kannanjgithub, I added you as you may want to pre-review, before the gRFC is finalized. I'm really only expecting bikeshedding on the label name (as part of the gRFC). This is introducing a new stable API, so take a special look at the Grpc class. |
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Thanks for putting this up. Changes look good. |
ejona86
added
TODO:release blocker
The existing tests really liked to use inconsistent CallOptions in the same test.
shivaspeaks
reviewed
Dec 28, 2025
| if (module.customLabelEnabled) { | ||
| builder.put( | ||
| CUSTOM_LABEL_KEY, info.getCallOptions().getOption(Grpc.CALL_OPTION_CUSTOM_LABEL)); | ||
| } |
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I see that javadoc for CALL_OPTION_CUSTOM_LABEL mentions "must not be set to null", however if an application developer inadvertently passes null using withOption, and here it will pass that null directly to the OpenTelemetry AttributesBuilder.put() method. Should we do an explicit null check here?
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Or use of Strings.nullToEmpty().
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TODO: Add tests
I've created this so I can reference it as an example from gRFC A108.