simplify extension's registrations apis

Signed-off-by: Roman <ixrock@gmail.com>

extensions/metrics-cluster-feature/renderer.tsx

@@ -3,23 +3,21 @@ import { MetricsFeature } from "./src/metrics-feature"
 import React from "react"
 
 export default class ClusterMetricsFeatureExtension extends LensRendererExtension {
-  registerClusterFeatures() {
-    return [
-      {
-        title: "Metrics Stack",
-        components: {
-          Description: () => {
-            return (
-              <span>
+  clusterFeatures = [
+    {
+      title: "Metrics Stack",
+      components: {
+        Description: () => {
+          return (
+            <span>
                 Enable timeseries data visualization (Prometheus stack) for your cluster.
                 Install this only if you don't have existing Prometheus stack installed.
                 You can see preview of manifests <a href="https://github.com/lensapp/lens/tree/master/extensions/lens-metrics/resources" target="_blank">here</a>.
               </span>
-            )
-          }
-        },
-        feature: new MetricsFeature()
-      }
-    ]
-  }
+          )
+        }
+      },
+      feature: new MetricsFeature()
+    }
+  ]
 }