Merge branch '2/edge' into yellow

src/alert_rules/prometheus/prometheus_alerts.yaml

@@ -1,6 +1,17 @@
 "groups":
 - "name": "opensearch.alerts"
   "rules":
+
+  - "alert": "OpenSearchScrapeFailed"
+    "annotations":
+      "message": "Scrape on {{ $labels.juju_unit }} failed. Ensure that the OpenSearch systemd service is healthy and that the unit is part of the cluster."
+      "summary": "OpenSearch exporter scrape failed"
+    "expr": |
+      up < 1
+    "for": "5m"
+    "labels":
+      "severity": "critical"
+
   - "alert": "OpenSearchClusterRed"
     "annotations":
       "message": "Cluster {{ $labels.cluster }} health status has been RED for at least 2m. Cluster does not accept writes, shards may be missing or master node hasn't been elected yet."