@Override
    public String toString() {
        return "GrpcSpanMessageConverter{" +
                "agentId='" + agentId + '\'' +
                ", applicationServiceType=" + applicationServiceType +
                ", spanProcessor=" + spanProcessor +
                '}';
    }
Not thread safe

@author Woonduk Kang(emeroad)
agent-module/profiler/src/main/java/com/navercorp/pinpoint/profiler/context/grpc/GrpcSpanMessageConverter.java