Cloud migrations: create route to delete token (#88297)

* Cloud migrations: create route to delete token

* gcom.DeleteToken returns ErrTokenNotFound instead of a boolean

* remove unnecessary comment

* make openapi3-gen && yarn run rtk-query-codegen-openapi ./scripts/generate-rtk-apis.ts

* gcom stub: implement DeleteToken

pkg/services/cloudmigration/cloudmigrationimpl/metric.go

@@ -1,29 +1,17 @@
 package cloudmigrationimpl
 
 import (
-	"errors"
-	"fmt"
-
 	"github.com/prometheus/client_golang/prometheus"
 )
 
-// type Metrics struct {
 const (
 	namespace = "grafana"
 	subsystem = "cloudmigrations"
 )
 
-var PromMetrics = []prometheus.Collector{
-	prometheus.NewCounterVec(prometheus.CounterOpts{
-		Namespace: namespace,
-		Subsystem: subsystem,
-		Name:      "datasources_migrated",
-		Help:      "Total amount of data sources migrated",
-	}, []string{"pdc_converted"}),
-}
-
 type Metrics struct {
 	accessTokenCreated *prometheus.CounterVec
+	accessTokenDeleted *prometheus.CounterVec
 }
 
 func newMetrics() *Metrics {
@@ -34,18 +22,21 @@ func newMetrics() *Metrics {
 			Name:      "access_token_created",
 			Help:      "Total of access tokens created",
 		}, []string{"slug"}),
+		accessTokenDeleted: prometheus.NewCounterVec(prometheus.CounterOpts{
+			Namespace: namespace,
+			Subsystem: subsystem,
+			Name:      "access_token_deleted",
+			Help:      "Total of access tokens deleted",
+		}, []string{"slug"}),
 	}
 }
 
-func (s *Service) registerMetrics(prom prometheus.Registerer, metrics *Metrics) error {
-	if err := prom.Register(metrics.accessTokenCreated); err != nil {
-		var alreadyRegisterErr prometheus.AlreadyRegisteredError
-		if errors.As(err, &alreadyRegisterErr) {
-			s.log.Warn("metric already registered", "metric", metrics.accessTokenCreated)
-		} else {
-			return fmt.Errorf("registering access token created metric: %w", err)
-		}
-	}
+func (metrics *Metrics) Collect(ch chan<- prometheus.Metric) {
+	metrics.accessTokenCreated.Collect(ch)
+	metrics.accessTokenDeleted.Collect(ch)
+}
 
-	return nil
+func (metrics *Metrics) Describe(ch chan<- *prometheus.Desc) {
+	metrics.accessTokenCreated.Describe(ch)
+	metrics.accessTokenDeleted.Describe(ch)
 }