code: func InitDBMetrics(dbMap *gorp.DbMap, scope metrics.Scope) {
  	// Create a dbMetrics instance and register prometheus metrics
  	dbm := newDbMetrics(dbMap, scope)
  
  	// Start the metric reporting goroutine to update the metrics periodically.
  	go dbm.reportDBMetrics()
  }
docs: // InitDBMetrics will register prometheus stats for the provided dbMap under the
  // given metrics.Scope. Every 1 second in a separate go routine the prometheus
  // stats will be updated based on the gorp dbMap's inner sql.DBMap's DBStats
  // structure values.