collectors[mg.CollectorPath] = mg
	}

	// Helper function to register a collector and return a gatherer for it.
	mustRegister := func(c ...prometheus.Collector) prometheus.Gatherer {
		subRegistry := prometheus.NewRegistry()
		for _, col := range c {
			subRegistry.MustRegister(col)
		}
		r.MustRegister(subRegistry)
		return subRegistry
	}

	// Register all collectors and create gatherers for them.

	bucketNamespace      = "bucket"
	minioNamespace       = "minio"
	diskNamespace        = "disk"
	interNodeNamespace   = "internode"
)

func init() {
	prometheus.MustRegister(httpRequestsDuration)
	prometheus.MustRegister(newMinioCollector())
	prometheus.MustRegister(minioVersionInfo)
}

// newMinioCollector describes the collector
// and returns reference of minioCollector
// It creates the Prometheus Description which is used