code: func PushMetrics(ctx context.Context, task string, gatewayURL string) {
  	if err := push.Collectors(
  		task, push.HostnameGroupingKey(),
  		gatewayURL,
  		histograms, counts, errcounts,
  	); err != nil {
  		fmt.Println("Could not push completion time to Pushgateway:", err)
  	}
  }
docs: // PushMetrics sends the metrics collected to the prometheus push gateway
  // at the url in `gatewayURL` with the job name of `task`
  // Should be called in a defer in main() of a cli application.
  // For long-running services, use ServeMetrics instead