assets: disable btrfs collector in node-exporter

Profiling shows that node-exporter is using ~16% of CPU time on updating btrfs details. This FS is not included in RHEL kernels, so it can be safely disabled

Author: vrutkovs

assets/node-exporter/daemonset.yaml

@@ -35,6 +35,7 @@ spec:
         - --path.rootfs=/host/root
         - --path.udev.data=/host/root/run/udev/data
         - --no-collector.wifi
+        - --no-collector.btrfs
         - --collector.filesystem.mount-points-exclude=^/(dev|proc|sys|run/k3s/containerd/.+|var/lib/docker/.+|var/lib/kubelet/pods/.+)($|/)
         - --collector.netclass.ignored-devices=^(veth.*|[a-f0-9]{15}|enP.*|ovn-k8s-mp[0-9]*|br-ex|br-int|br-ext|br[0-9]*|tun[0-9]*|cali[a-f0-9]*)$
         - --collector.netdev.device-exclude=^(veth.*|[a-f0-9]{15}|enP.*|ovn-k8s-mp[0-9]*|br-ex|br-int|br-ext|br[0-9]*|tun[0-9]*|cali[a-f0-9]*)$