Drop the sigs.k8s.io/metrics-server dependency

go.mod

@@ -23,10 +23,11 @@ require (
 	k8s.io/utils v0.0.0-20220210201930-3a6ce19ff2f9
 	sigs.k8s.io/controller-runtime v0.11.2 // v0.12.1
 	sigs.k8s.io/custom-metrics-apiserver v1.23.0 // v1.22.0 // v1.23.0
-	sigs.k8s.io/metrics-server v0.6.4
 )
 
 require (
+	cloud.google.com/go/compute/metadata v0.2.3 // indirect
+	github.com/BurntSushi/toml v1.2.1 // indirect
 	github.com/NYTimes/gziphandler v1.1.1 // indirect
 	github.com/PuerkitoBio/purell v1.2.0 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
@@ -69,6 +70,8 @@ require (
 	github.com/prometheus/client_model v0.2.0 // indirect
 	github.com/prometheus/common v0.31.0 // indirect
 	github.com/prometheus/procfs v0.6.0 // indirect
+	github.com/spf13/afero v1.9.4 // indirect
+	github.com/stretchr/testify v1.8.2 // indirect
 	go.etcd.io/etcd/api/v3 v3.5.7 // indirect
 	go.etcd.io/etcd/client/pkg/v3 v3.5.7 // indirect
 	go.etcd.io/etcd/client/v3 v3.5.7 // indirect

pkg/metrics_provider/metrics_provider_service.go

@@ -12,7 +12,6 @@ import (
 	genericapiserver "k8s.io/apiserver/pkg/server"
 	customexternalmetrics "sigs.k8s.io/custom-metrics-apiserver/pkg/apiserver"
 	basecmd "sigs.k8s.io/custom-metrics-apiserver/pkg/cmd"
-	"sigs.k8s.io/metrics-server/pkg/api"
 
 	generatedopenapi "github.com/gardener/gardener-custom-metrics/pkg/api/generated/openapi"
 	"github.com/gardener/gardener-custom-metrics/pkg/app"
@@ -48,7 +47,7 @@ func NewMetricsProviderService() *MetricsProviderService {
 			Name: adapterName,
 			OpenAPIConfig: genericapiserver.DefaultOpenAPIConfig(
 				generatedopenapi.GetOpenAPIDefinitions,
-				openapinamer.NewDefinitionNamer(api.Scheme, customexternalmetrics.Scheme)),
+				openapinamer.NewDefinitionNamer(customexternalmetrics.Scheme)),
 		},
 		maxSampleAge:  90 * time.Second,
 		maxSampleGap:  600 * time.Second,