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gRPC integration that uses the brave api to submit client and server side span information.

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package com.github.kristofa.brave.grpc;

import com.twitter.zipkin.gen.BinaryAnnotation;
import io.grpc.Status;

/** Well-known {@link BinaryAnnotation#key binary annotation keys} for gRPC */
public final class GrpcKeys {

    /**
     * The {@link Status.Code}, when not "OK". Ex. "CANCELLED"
     *
     * Used to filter for error status.
     */
    public static final String GRPC_STATUS_CODE = "grpc.status_code";

    private GrpcKeys() {
    }
}