metrics name correct with standard (#319)

prefix metrics

internal/metrics/metrics.go

@@ -4,6 +4,11 @@ import (
 	"github.com/kyma-project/btp-manager/internal/conditions"
 	"github.com/prometheus/client_golang/prometheus"
 	"sigs.k8s.io/controller-runtime/pkg/metrics"
+	"strings"
+)
+
+const (
+	metricsNamespace = "btpmanager"
 )
 
 type Metrics struct {
@@ -14,7 +19,7 @@ func (m *Metrics) registerMetrics() {
 	m.ReasonCounters = make(map[conditions.Reason]prometheus.Counter, len(conditions.Reasons))
 	for reason, metadata := range conditions.Reasons {
 		counter := prometheus.NewCounter(prometheus.CounterOpts{
-			Name:        string(reason),
+			Name:        prometheus.BuildFQName(metricsNamespace, "", strings.ToLower(string(reason))),
 			ConstLabels: prometheus.Labels{"state": string(metadata.State)},
 		})
 		m.ReasonCounters[reason] = counter