private static HealthCheckResponse getHealthCheckResponse(ServingStatus status) {
        switch (status) {
            case SERVING:
                return SERVING_RESPONSE;
            case NOT_SERVING:
                return NOT_SERVING_RESPONSE;
            case SERVICE_UNKNOWN:
                return SERVICE_UNKNOWN_RESPONSE;
            default:
                throw new IllegalArgumentException("Invalid status:" + status);
        }
    }
Returns a new builder which builds a new {@link GrpcHealthCheckService}.
grpc/src/main/java/com/linecorp/armeria/server/grpc/GrpcHealthCheckService.java