Enhancement: Change default k8s label selector to be from resource

src/pages/api/kubernetes/stats/[...service].js

@@ -4,10 +4,11 @@ import getKubeConfig from "../../../../utils/config/kubernetes";
 import { parseCpu, parseMemory } from "../../../../utils/kubernetes/kubernetes-utils";
 import createLogger from "../../../../utils/logger";
 
+import { parseIngressSelector } from "utils/kubernetes/kubernetes-utils";
+
 const logger = createLogger("kubernetesStatsService");
 
 export default async function handler(req, res) {
-  const APP_LABEL = "app.kubernetes.io/name";
   const { service, podSelector } = req.query;
 
   const [namespace, appName] = service;
@@ -17,7 +18,6 @@ export default async function handler(req, res) {
     });
     return;
   }
-  const labelSelector = podSelector !== undefined ? podSelector : `${APP_LABEL}=${appName}`;
 
   try {
     const kc = getKubeConfig();
@@ -28,6 +28,7 @@ export default async function handler(req, res) {
       return;
     }
     const coreApi = kc.makeApiClient(CoreV1Api);
+    const labelSelector = podSelector !== undefined ? podSelector : await parseIngressSelector(appName, namespace, kc);
     const metricsApi = new Metrics(kc);
     const podsResponse = await coreApi
       .listNamespacedPod(namespace, null, null, null, null, labelSelector)

src/pages/api/kubernetes/status/[...service].js

@@ -3,10 +3,11 @@ import { CoreV1Api } from "@kubernetes/client-node";
 import getKubeConfig from "../../../../utils/config/kubernetes";
 import createLogger from "../../../../utils/logger";
 
+import { parseIngressSelector } from "utils/kubernetes/kubernetes-utils";
+
 const logger = createLogger("kubernetesStatusService");
 
 export default async function handler(req, res) {
-  const APP_LABEL = "app.kubernetes.io/name";
   const { service, podSelector } = req.query;
 
   const [namespace, appName] = service;
@@ -16,7 +17,6 @@ export default async function handler(req, res) {
     });
     return;
   }
-  const labelSelector = podSelector !== undefined ? podSelector : `${APP_LABEL}=${appName}`;
   try {
     const kc = getKubeConfig();
     if (!kc) {
@@ -25,6 +25,7 @@ export default async function handler(req, res) {
       });
       return;
     }
+    const labelSelector = podSelector !== undefined ? podSelector : await parseIngressSelector(appName, namespace, kc);
     const coreApi = kc.makeApiClient(CoreV1Api);
     const podsResponse = await coreApi
       .listNamespacedPod(namespace, null, null, null, null, labelSelector)

src/utils/kubernetes/kubernetes-utils.js

@@ -1,3 +1,16 @@
+import { CoreV1Api, NetworkingV1Api } from "@kubernetes/client-node";
+
+export async function parseIngressSelector(ingressName, namespace, kc) {
+  const coreApi = kc.makeApiClient(CoreV1Api);
+  const networkApi = kc.makeApiClient(NetworkingV1Api);
+
+  const ingress = await networkApi.readNamespacedIngress(ingressName, namespace);
+  const serviceName = ingress.body.spec.rules[0].http.paths[0].backend.service.name;
+
+  const svc = await coreApi.readNamespacedService(serviceName, namespace);
+  return svc.body.spec.selector;
+}
+
 export function parseCpu(cpuStr) {
   const unitLength = 1;
   const base = Number.parseInt(cpuStr, 10);