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>

extensions/telemetry/src/tracker.ts

@@ -118,7 +118,8 @@ export class Tracker extends Util.Singleton {
       kubernetesVersion: cluster.metadata.version,
       distribution: cluster.metadata.distribution,
       nodesCount: cluster.metadata.nodes,
-      lastSeen: cluster.metadata.lastSeen
+      lastSeen: cluster.metadata.lastSeen,
+      prometheus: cluster.metadata.prometheus
     });
   }