Add 'host' label to all metrics

main.go

@@ -93,47 +93,49 @@ func NewExporter(uri string) *Exporter {
 			prometheus.BuildFQName(namespace, "", "up"),
 			"Is the Nexenta API reachable",
 			nil,
-			nil),
+			prometheus.Labels{"host":*apiHost},
+		),
 		scrapeFailures: prometheus.NewCounter(prometheus.CounterOpts{
 			Namespace:   namespace,
 			Name:        "exporter_scrape_failures_total",
 			Help:        "Number of errors while scraping the Nexenta API",
+			ConstLabels: prometheus.Labels{"host":*apiHost},
 		}),
 		volumeOnline: prometheus.NewDesc(
 			prometheus.BuildFQName(namespace, "volume", "online"),
 			"Status of volume.",
 			[]string{"volume"},
-			nil,
+			prometheus.Labels{"host":*apiHost},
 		),
 		jbodStatus: prometheus.NewDesc(
 			prometheus.BuildFQName(namespace, "jbod", "status"),
 			"Status of JBOD.",
 			[]string{"jbod"},
-			nil,
+			prometheus.Labels{"host":*apiHost},
 		),
 		jbodTemp: prometheus.NewDesc(
 			prometheus.BuildFQName(namespace, "jbod", "temp"),
 			"Temperature of JBOD.",
 			[]string{"jbod", "name", "state"},
-			nil,
+			prometheus.Labels{"host":*apiHost},
 		),
 		jbodVoltage: prometheus.NewDesc(
 			prometheus.BuildFQName(namespace, "jbod", "voltage"),
 			"Voltage of JBOD.",
 			[]string{"jbod", "name", "state"},
-			nil,
+			prometheus.Labels{"host":*apiHost},
 		),
 		jbodSlotStatus: prometheus.NewDesc(
 			prometheus.BuildFQName(namespace, "jbod", "slot_status"),
 			"Status of JBOD slot.",
 			[]string{"jbod", "slot", "state"},
-			nil,
+			prometheus.Labels{"host":*apiHost},
 		),
 		licenseDaysLeft: prometheus.NewDesc(
 			prometheus.BuildFQName(namespace, "license", "days_left"),
 			"License days left.",
 			nil,
-			nil,
+			prometheus.Labels{"host":*apiHost},
 		),
 		client: &http.Client{
 			Transport: &http.Transport{