alert-mgmt-01: add alerting health stub endpoint

\nSigned-off-by: avlitman <alitman@redhat.com>\nSigned-off-by: Shirly Radco <sradco@redhat.com>\nSigned-off-by: machadovilaca <machadovilaca@gmail.com>\nCo-authored-by: Cursor AI Agent <cursor-ai@users.noreply.github.com>\n

Author: sradco

cmd/plugin-backend.go

@@ -16,7 +16,7 @@ var (
 	portArg             = flag.Int("port", 0, "server port to listen on (default: 9443)\nports 9444 and 9445 reserved for other use")
 	certArg             = flag.String("cert", "", "cert file path to enable TLS (disabled by default)")
 	keyArg              = flag.String("key", "", "private key file path to enable TLS (disabled by default)")
-	featuresArg         = flag.String("features", "", "enabled features, comma separated.\noptions: ['acm-alerting', 'incidents', 'dev-config', 'perses-dashboards']")
+	featuresArg         = flag.String("features", "", "enabled features, comma separated.\noptions: ['acm-alerting', 'incidents', 'dev-config', 'perses-dashboards', 'alert-management-api']")
 	staticPathArg       = flag.String("static-path", "", "static files path to serve frontend (default: './web/dist')")
 	configPathArg       = flag.String("config-path", "", "config files path (default: './config')")
 	pluginConfigArg     = flag.String("plugin-config-path", "", "plugin yaml configuration")

pkg/server.go

@@ -60,6 +60,7 @@ const (
 	Incidents        Feature = "incidents"
 	DevConfig        Feature = "dev-config"
 	PersesDashboards Feature = "perses-dashboards"
+	AlertManagement  Feature = "alert-management-api"
 )
 
 func (pluginConfig *PluginConfig) MarshalJSON() ([]byte, error) {
@@ -229,6 +230,12 @@ func setupRoutes(cfg *Config) (*mux.Router, *PluginConfig) {
 
 	router.PathPrefix("/health").HandlerFunc(healthHandler())
 
+	// Stub endpoint to make the intended alert-management API shape reviewable
+	// early in the PR series, without pulling in the full router/management stack yet.
+	if cfg.Features[AlertManagement] {
+		router.HandleFunc("/api/v1/alerting/health", alertManagementHealthStub()).Methods(http.MethodGet)
+	}
+
 	router.Path("/plugin-manifest.json").Handler(manifestHandler(cfg))
 
 	router.PathPrefix("/features").HandlerFunc(featuresHandler(cfg))
@@ -238,6 +245,18 @@ func setupRoutes(cfg *Config) (*mux.Router, *PluginConfig) {
 	return router, pluginConfig
 }
 
+func alertManagementHealthStub() http.HandlerFunc {
+	type resp struct {
+		Error string `json:"error"`
+	}
+	return func(w http.ResponseWriter, _ *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		w.Header().Set("Cache-Control", "no-store")
+		w.WriteHeader(http.StatusNotImplemented)
+		_ = json.NewEncoder(w).Encode(resp{Error: "alert management API not implemented yet"})
+	}
+}
+
 func setupProxyRoutes(cfg *Config, k8sclient *dynamic.DynamicClient, kind proxy.KindType) *mux.Router {
 	router := mux.NewRouter()
 	var proxyUrl string