remove filter

grafana-agent already inject the juju topology, so it's not
necessary to filter by jobs or application

src/alert_rules/prometheus/prometheus_alerts.yaml

@@ -7,7 +7,7 @@
       "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{job=~".*opensearch_.*"} < 1
+      up < 1
     "for": "5m"
     "labels":
       "severity": "critical"