Handle the error when fetching pod metrics

Include the `PodStatus` into the `FetchResponse` union type. Now the method `fetchPodMetricsByNamespaces` accepts a set of namespaces and return a `FetchResponseWrapper`, which is consistent with other public fetch methods.

The Kubernetes errors happened when fetching pod metrics is now captured and returned to the frontend.

Signed-off-by: Mengnan Gong <namco1992@gmail.com>

plugins/kubernetes-common/src/types.ts

@@ -16,6 +16,7 @@
 
 import type { JsonObject } from '@backstage/types';
 import {
+  PodStatus,
   V1ConfigMap,
   V1CronJob,
   V1DaemonSet,
@@ -134,7 +135,8 @@ export type FetchResponse =
   | IngressesFetchResponse
   | CustomResourceFetchResponse
   | StatefulSetsFetchResponse
-  | DaemonSetsFetchResponse;
+  | DaemonSetsFetchResponse
+  | PodStatusFetchResponse;
 
 /** @public */
 export interface PodFetchResponse {
@@ -214,6 +216,12 @@ export interface DaemonSetsFetchResponse {
   resources: Array<V1DaemonSet>;
 }
 
+/** @public */
+export interface PodStatusFetchResponse {
+  type: 'podstatus';
+  resources: Array<PodStatus>;
+}
+
 /** @public */
 export interface KubernetesFetchError {
   errorType: KubernetesErrorTypes;