grafana: pull out prom. net. rec. err. alerts for OPNs. to ex. wg int.

Pull out prometheus network receive error alerts for OPNsense to exclude
its WireGuard interfaces, which like to throw errors, but which aren't
of importance.

resources/chaosknoten/grafana/docker_compose/prometheus_alerts.rules.yaml

@@ -79,14 +79,26 @@ groups:
         annotations:
           summary: Host unusual network throughput out (instance {{ $labels.instance }})
           description: "Host network interfaces are probably sending too much data (> 100 MB/s)\n  VALUE = {{ $value }}"
+      # General network receive error alerts.
+      # Excluding: OPNsense hosts
       - alert: HostNetworkReceiveErrors
-        expr: (rate(node_network_receive_errs_total[2m]) / rate(node_network_receive_packets_total[2m]) > 0.01) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
+        expr: (rate(node_network_receive_errs_total[2m]) / rate(node_network_receive_packets_total[2m]) > 0.01) * on(instance) group_left (nodename) node_uname_info{nodename=~".+", nodename!="OPNsense"}
         for: 2m
         labels:
           severity: warning
         annotations:
           summary: Host Network Receive Errors (instance {{ $labels.instance }})
           description: "Host {{ $labels.instance }} interface {{ $labels.device }} has encountered {{ printf \"%.0f\" $value }} receive errors in the last two minutes.\n  VALUE = {{ $value }}"
+      # OPNsense network receive error alerts.
+      # This is the same as the regular network receive error alerts, but excluding the WireGuard interfaces as they like to throw errors, but which aren't of importance.
+      - alert: OPNsenseHostNetworkReceiveErrors
+        expr: (rate(node_network_receive_errs_total{device!~"wg.+"}[2m]) / rate(node_network_receive_packets_total{device!~"wg.+"}[2m]) > 0.01) * on(instance) group_left (nodename) node_uname_info{nodename="OPNsense"}
+        for: 2m
+        labels:
+          severity: warning
+        annotations:
+          summary: OPNsense host Network Receive Errors (instance {{ $labels.instance }})
+          description: "Host {{ $labels.instance }} interface {{ $labels.device }} has encountered {{ printf \"%.0f\" $value }} receive errors in the last two minutes.\n  VALUE = {{ $value }}"
       - alert: HostNetworkTransmitErrors
         expr: (rate(node_network_transmit_errs_total[2m]) / rate(node_network_transmit_packets_total[2m]) > 0.01) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
         for: 2m