prometheus: disable HostUnusualNetworkThroughputOut

This alert only triggers for america.mirror.pkgbuild.com. Ideally, we
should be able to increase the trigger point for high-bandwidth boxes.
I don't see a straightforward way to implement it, so disable for now.

roles/prometheus/files/node.rules.yml

@@ -47,14 +47,15 @@ groups:
           summary: "Host unusual network throughput in (instance {{ $labels.instance }})"
           description: "Host network interfaces are probably receiving too much data (> 100 MB/s)\n  VALUE = {{ $value }}\n  LABELS: {{ $labels }}"
 
-      - alert: HostUnusualNetworkThroughputOut
-        expr: sum by (instance) (irate(node_network_transmit_bytes_total[2m])) / 1024 / 1024 > 100
-        for: 5m
-        labels:
-          severity: warning
-        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 }}\n  LABELS: {{ $labels }}"
+      ### Disabled due to only (incorrectly) triggering for america.mirror.pkgbuild.com
+      # - alert: HostUnusualNetworkThroughputOut
+      #   expr: sum by (instance) (irate(node_network_transmit_bytes_total[2m])) / 1024 / 1024 > 100
+      #   for: 5m
+      #   labels:
+      #     severity: warning
+      #   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 }}\n  LABELS: {{ $labels }}"
 
       - alert: HostOutOfDiskSpace
         expr: (node_filesystem_avail_bytes{fstype!="tmpfs",mountpoint!~"/backup.*"} * 100) / node_filesystem_size_bytes < 10