private Consumer<String> watcherHealthUpdater() {
        return serviceName -> {
            synchronized (watchers) {
                final ServingStatus status = checkServingStatus(serviceName);
                final HealthCheckResponse healthCheckResponse = getHealthCheckResponse(status);
                watchers.get(serviceName).forEach(streamObserver -> streamObserver.onNext(healthCheckResponse));
            }
        };
    }
Returns a new builder which builds a new {@link GrpcHealthCheckService}.
grpc/src/main/java/com/linecorp/armeria/server/grpc/GrpcHealthCheckService.java