grpc/grpc-java
Cardinality of grpc_target attribute for grpc.client.* metrics is too large
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#12,322 创建于 2025年8月28日
enhancementhelp wanted
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描述
What version of gRPC-Java are you using?
1.71.0
What is your environment?
OS: Linux JDK: 21
What did you expect to see?
No warnings when enabling default OpenTelemetry metrics.
What did you see instead?
WARNING: Instrument grpc.client.attempt.started has exceeded the maximum allowed cardinality (1999).
WARNING: Instrument grpc.client.attempt.rcvd_total_compressed_message_size has exceeded the maximum allowed cardinality (1999).
WARNING: Instrument grpc.client.attempt.sent_total_compressed_message_size has exceeded the maximum allowed cardinality (1999).
WARNING: Instrument grpc.client.call.duration has exceeded the maximum allowed cardinality (1999).
WARNING: Instrument grpc.client.attempt.duration has exceeded the maximum allowed cardinality (1999).
This is caused by the grpc_target attribute having a very large cardinality.
I see that this attribute is listed for these metrics at https://github.com/grpc/proposal/blob/master/A66-otel-stats.md. However, for very large deployments this can be problematic. Is there a way to turn this attribute off?
Steps to reproduce the bug
Have a client which connects to 2000+ servers (either at once or over time).