chore(prometheus): move prometheus to a new file

prometheus.go

@@ -0,0 +1,17 @@
+package kvm
+
+import (
+	"net/http"
+
+	"github.com/prometheus/client_golang/prometheus"
+	versioncollector "github.com/prometheus/client_golang/prometheus/collectors/version"
+	"github.com/prometheus/common/version"
+)
+
+var promHandler http.Handler
+
+func initPrometheus() {
+	// A Prometheus metrics endpoint.
+	version.Version = builtAppVersion
+	prometheus.MustRegister(versioncollector.NewCollector("jetkvm"))
+}