Dashboard json updates

docs/user-guide/.pages

@@ -7,5 +7,7 @@ nav:
   - external.md
   - shrink-expand.md
   - profiles.md
-  - grafana.md
+  - Telemetry:
+    - grafana.md
+    - grafana_config_details.md
   - ...

docs/user-guide/boards/grafana_alarm.json

@@ -0,0 +1 @@
+{"apiVersion":1,"groups":[{"orgId":1,"name":"Switch Heartbeat Eval Group","folder":"Hedgehog Fabric","interval":"1m","rules":[{"uid":"bf31m0bchkpoga","title":"Switch Connectivity","condition":"C","data":[{"refId":"A","relativeTimeRange":{"from":600,"to":0},"datasourceUid":"grafanacloud-prom","model":{"editorMode":"code","expr":"increase(fabric_agent_agent_heartbeats_total{env=\"HedgehogEnv\"}[3m])","instant":true,"intervalMs":1000,"legendFormat":"__auto","maxDataPoints":43200,"range":false,"refId":"A"}},{"refId":"C","relativeTimeRange":{"from":0,"to":0},"datasourceUid":"__expr__","model":{"conditions":[{"evaluator":{"params":[3],"type":"lt"},"operator":{"type":"and"},"query":{"params":["C"]},"reducer":{"params":[],"type":"last"},"type":"query"}],"datasource":{"type":"__expr__","uid":"__expr__"},"expression":"A","intervalMs":1000,"maxDataPoints":43200,"refId":"C","type":"threshold"}}],"noDataState":"NoData","execErrState":"Error","for":"1m","annotations":{"summary":"Switches have not updated heartbeats"},"labels":{},"isPaused":false,"notification_settings":{"receiver":"Harry Hedgehog"}}]}]}