Store prometheus cluster metadata based on metrics request responses (#1438)

* Store prometheus metadata for clusters based on metrics requests

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

* Use ClusterMetadataKey.PROMETEHUS as key

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

* Update metadata only if it is changed

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

* Use structural comparer as default for store sync reaction

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

* No need to compare metadata as json anymore

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

* Use structural comparer only in cluster-store

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

* Refactoring

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

* React only prometeheus preference changes to re-initialise prometheus connection

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

* Add missing semicolons

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

* Fix imports

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

* Report metrics status in cluster-report (#1443)

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

* Apply suggestions from code review

Co-authored-by: Sebastian Malton <sebastian@malton.name>
Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

* Fix logger reference

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

Co-authored-by: Sebastian Malton <sebastian@malton.name>

src/main/routes/metrics-route.ts

@@ -1,7 +1,9 @@
+import _ from "lodash";
 import { LensApiRequest } from "../router";
 import { LensApi } from "../lens-api";
-import { Cluster } from "../cluster";
-import _ from "lodash";
+import { Cluster, ClusterMetadataKey } from "../cluster";
+import { ClusterPrometheusMetadata } from "../../common/cluster-store";
+import logger from "../logger";
 
 export type IMetricsQuery = string | string[] | {
   [metricName: string]: string;
@@ -22,11 +24,9 @@ async function loadMetrics(promQueries: string[], cluster: Cluster, prometheusPa
         try {
           return await cluster.getMetrics(prometheusPath, { query, ...queryParams });
         } catch (error) {
-          if (lastAttempt || error?.statusCode === 404) {
-            return {
-              status: error.toString(),
-              data: { result: [] },
-            };
+          if (lastAttempt || (error?.statusCode >= 400 && error?.statusCode < 500)) {
+            logger.error("[Metrics]: metrics not available", { error });
+            throw new Error("Metrics not available");
           }
 
           await new Promise(resolve => setTimeout(resolve, (attempt + 1) * 1000)); // add delay before repeating request
@@ -43,13 +43,19 @@ async function loadMetrics(promQueries: string[], cluster: Cluster, prometheusPa
 class MetricsRoute extends LensApi {
   async routeMetrics({ response, cluster, payload, query }: LensApiRequest) {
     const queryParams: IMetricsQuery = Object.fromEntries(query.entries());
-
+    const prometheusMetadata: ClusterPrometheusMetadata = {};
     try {
       const [prometheusPath, prometheusProvider] = await Promise.all([
         cluster.contextHandler.getPrometheusPath(),
         cluster.contextHandler.getPrometheusProvider()
       ]);
-
+      prometheusMetadata.provider = prometheusProvider?.id;
+      prometheusMetadata.autoDetected = !cluster.preferences.prometheusProvider?.type;
+      if (!prometheusPath) {
+        prometheusMetadata.success = false;
+        this.respondJson(response, {});
+        return;
+      }
       // return data in same structure as query
       if (typeof payload === "string") {
         const [data] = await loadMetrics([payload], cluster, prometheusPath, queryParams);
@@ -65,8 +71,12 @@ class MetricsRoute extends LensApi {
         const data = Object.fromEntries(Object.keys(payload).map((metricName, i) => [metricName, result[i]]));
         this.respondJson(response, data);
       }
+      prometheusMetadata.success = true;
     } catch {
+      prometheusMetadata.success = false;
       this.respondJson(response, {});
+    } finally {
+      cluster.metadata[ClusterMetadataKey.PROMETHEUS] = prometheusMetadata;
     }
   }
 }