node_systemd_unit_state metric is missing on /metrics endpoint

[saimanoj90]

Host operating system:

Linux edge-***** 5.14.21-150500.55.59-default #1 SMP PREEMPT_DYNAMIC Thu Apr 18 12:59:33 UTC 2024 (e8ae24a) x86_64 x86_64 x86_64 GNU/Linux

node_exporter version:
node_exporter, version 1.8.2 (branch: HEAD, revision: f1e0e83)
build user: root@03d440803209
build date: 20240714-11:53:45
go version: go1.22.5
platform: linux/amd64
tags: unknown

node_exporter command line flags

/bin/node_exporter --path.procfs=/host/proc
--path.sysfs=/host/sys --path.rootfs=/host/root
--path.udev.data=/host/root/run/udev/data
--web.listen-address=[0.0.0.0]:9100 --collector.filesystem.mount-points-exclude=^/(dev|proc|sys|var/lib/docker/.+|var/lib/kubelet/.+)($|/)
--collector.filesystem.fs-types-exclude=^(autofs|binfmt_misc|bpf|cgroup2?|configfs|debugfs|devpts|devtmpfs|fusectl|hugetlbfs|iso9660|mqueue|nsfs|overlay|proc|procfs|pstore|rpc_pipefs|securityfs|selinuxfs|squashfs|sysfs|tracefs)$ --collector.systemd.unit-include=k3s.service,stylus-agent.service,stylus-operator.service,sshd.service,systemd-resolved.service,systemd-journald.service,kdump.service,rsyslog.service,firewalld.service,chronyd.service,systemd-networkd.service,systemd-sysctl.service,systemd-logind.service,logrotate.service
--collector.systemd

Are you running node_exporter as a container?

Yes, running as a pod in k3s cluster with hostPID: true and hostNetwork: true (effectively running on host)

What did you do that produced an error?
edge-XX:~ # curl -s http://127.0.0.1:9100/metrics | grep -v "#" | grep node_systemd
node_systemd_system_running 0
node_systemd_units{state="activating"} 0
node_systemd_units{state="active"} 1176
node_systemd_units{state="deactivating"} 0
node_systemd_units{state="failed"} 1
node_systemd_units{state="inactive"} 100
node_systemd_version{version="249.17+suse.218.g2cb4d40f1c"} 249.17

What did you expect to see?

I expect node_systemd_unit_state metric to be exported.