Use ClusterMetadataKey.PROMETEHUS as key

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

src/main/cluster.ts

@@ -27,7 +27,8 @@ export enum ClusterMetadataKey {
   CLUSTER_ID = "id",
   DISTRIBUTION = "distribution",
   NODES_COUNT = "nodes",
-  LAST_SEEN = "lastSeen"
+  LAST_SEEN = "lastSeen",
+  PROMETHEUS = "prometheus"
 }
 
 export type ClusterRefreshOptions = {

src/main/routes/metrics-route.ts

@@ -1,6 +1,6 @@
 import { LensApiRequest } from "../router"
 import { LensApi } from "../lens-api"
-import { Cluster } from "../cluster"
+import { Cluster, ClusterMetadataKey } from "../cluster"
 import _ from "lodash"
 import { ClusterPrometheusMetadata } from "../../common/cluster-store"
 
@@ -73,7 +73,7 @@ class MetricsRoute extends LensApi {
       prometheusMetadata["success"] = false
       this.respondJson(response, {})
     } finally {
-      cluster.metadata["prometheus"] = prometheusMetadata
+      cluster.metadata[ClusterMetadataKey.PROMETHEUS] = prometheusMetadata
     }
   }
 }