code: func Collectors(job string, grouping map[string]string, url string, collectors ...prometheus.Collector) error {
  	return pushCollectors(job, grouping, url, "PUT", collectors...)
  }
docs: // Collectors works like FromGatherer, but it does not use a Gatherer. Instead,
  // it collects from the provided collectors directly. It is a convenient way to
  // push only a few metrics.
  //
  // Deprecated: Please use a Pusher created with New instead.