Node Exporter: add parameter for ignored network devices (#1887)

jsonnet/kube-prometheus/components/node-exporter.libsonnet

@@ -15,6 +15,10 @@ local defaults = {
   },
   listenAddress:: '127.0.0.1',
   filesystemMountPointsExclude:: '^/(dev|proc|sys|run/k3s/containerd/.+|var/lib/docker/.+|var/lib/kubelet/pods/.+)($|/)',
+  // NOTE: ignore veth network interface associated with containers.
+  // OVN renames veth.* to <rand-hex>@if<X> where X is /sys/class/net/<if>/ifindex
+  // thus [a-z0-9] regex below
+  ignoredNetworkDevices:: '^(veth.*|[a-f0-9]{15})$',
   port:: 9100,
   commonLabels:: {
     'app.kubernetes.io/name': defaults.name,
@@ -200,11 +204,8 @@ function(params) {
         '--no-collector.wifi',
         '--no-collector.hwmon',
         '--collector.filesystem.mount-points-exclude=' + ne._config.filesystemMountPointsExclude,
-        // NOTE: ignore veth network interface associated with containers.
-        // OVN renames veth.* to <rand-hex>@if<X> where X is /sys/class/net/<if>/ifindex
-        // thus [a-z0-9] regex below
-        '--collector.netclass.ignored-devices=^(veth.*|[a-f0-9]{15})$',
-        '--collector.netdev.device-exclude=^(veth.*|[a-f0-9]{15})$',
+        '--collector.netclass.ignored-devices=' + ne._config.ignoredNetworkDevices,
+        '--collector.netdev.device-exclude=' + ne._config.ignoredNetworkDevices,
       ],
       volumeMounts: [
         { name: 'sys', mountPath: '/host/sys', mountPropagation: 'HostToContainer', readOnly: true },