Expose the unified metric provider interface as a service

go.mod

@@ -13,6 +13,7 @@ require (
 	github.com/stretchr/testify v1.8.0
 	go.uber.org/zap v1.21.0
 	google.golang.org/grpc v1.47.0
+	google.golang.org/protobuf v1.28.0
 	gopkg.in/yaml.v2 v2.4.0
 	k8s.io/api v0.25.0
 	k8s.io/apimachinery v0.25.0
@@ -90,7 +91,6 @@ require (
 	gomodules.xyz/jsonpatch/v2 v2.2.0 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
 	google.golang.org/genproto v0.0.0-20220502173005-c8bf987b8c21 // indirect
-	google.golang.org/protobuf v1.28.0 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	k8s.io/apiextensions-apiserver v0.25.0 // indirect

main.go

@@ -56,6 +56,7 @@ import (
 	metricprovider "github.com/traas-stack/kapacity/pkg/metric/provider"
 	"github.com/traas-stack/kapacity/pkg/metric/provider/metricsapi"
 	"github.com/traas-stack/kapacity/pkg/metric/provider/prometheus"
+	metricservice "github.com/traas-stack/kapacity/pkg/metric/service"
 	"github.com/traas-stack/kapacity/pkg/portrait/algorithm/externaljob/jobcontroller"
 	"github.com/traas-stack/kapacity/pkg/portrait/algorithm/externaljob/resultfetcher"
 	portraitgenerator "github.com/traas-stack/kapacity/pkg/portrait/generator"
@@ -274,6 +275,8 @@ func main() {
 
 	if grpcServerAddr != "" && grpcServerAddr != "0" {
 		server := internalgrpc.NewServer(grpcServerAddr)
+		metricProviderServer := metricservice.NewProviderServer(metricProvider)
+		metricProviderServer.RegisterTo(server.ServiceRegistrar())
 		if err := mgr.Add(server); err != nil {
 			setupLog.Error(err, "unable to set up gRPC server")
 			os.Exit(1)