public boolean isKeepAliveWithoutCalls() {
        return keepAliveWithoutCalls;
    }
NOTE module accessibility
@see com.navercorp.pinpoint.bootstrap.java9.module.ModuleSupport#addPermissionToValueAnnotation(JavaModule)
@author jaehong.kim
grpc/src/main/java/com/navercorp/pinpoint/grpc/client/config/ClientOption.java