code: func (c *goCollector) Describe(ch chan<- *Desc) {
  	ch <- c.goroutinesDesc
  	ch <- c.threadsDesc
  	ch <- c.gcDesc
  	ch <- c.goInfoDesc
  	for _, i := range c.metrics {
  		ch <- i.desc
  	}
  }
docs: // Describe returns all descriptions of the collector.