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Not getting any process metrics from process exporter on Debian 12 (bookworm) #285

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darknetehf opened this issue Dec 20, 2023 · 2 comments
Open

Not getting any process metrics from process exporter on Debian 12 (bookworm) #285

darknetehf opened this issue Dec 20, 2023 · 2 comments

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@darknetehf
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Hi,

This is a possibly related issue: #284

Output of prometheus-process-exporter -version:

process-exporter, version  (branch: debian/sid, revision: 0.7.10-3+b5)
  build user:       team+pkg-go@tracker.debian.org
  build date:       20230409-10:13:36
  go version:       go1.19.8
  platform:         linux/amd64

OS: Debian GNU/Linux 12 (bookworm)
How the package was installed: the package was installed using Ansible:

    - name: "Install Prometheus exporters"
      apt:
        name:
          - prometheus-node-exporter # 9100
          - prometheus-postfix-exporter # 9154
          - prometheus-process-exporter # 9256

Running in debug mode, on a different port (9257):
prometheus-process-exporter -debug -web.listen-address :9257
We can see that process discovery seems to be taking place normally, but no metrics are returned on the /metrics endpoint:

2023/12/20 21:19:13 Reading metrics from /proc for procnames: []
2023/12/20 21:19:13 using cmdline matchnamer: map[]
2023/12/20 21:19:13 found new proc: {Pid:1 StartTimeRel:3}:{Name:systemd Cmdline:[/sbin/init] Cgroups:[/init.scope] ParentPid:0 StartTime:2023-12-20 21:17:00.03 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:2 StartTimeRel:3}:{Name:kthreadd Cmdline:[] Cgroups:[/] ParentPid:0 StartTime:2023-12-20 21:17:00.03 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:3 StartTimeRel:14}:{Name:rcu_gp Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:4 StartTimeRel:14}:{Name:rcu_par_gp Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:5 StartTimeRel:14}:{Name:slub_flushwq Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:6 StartTimeRel:14}:{Name:netns Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:7 StartTimeRel:14}:{Name:kworker/0:0-cgroup_destroy Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:8 StartTimeRel:14}:{Name:kworker/0:0H-kblockd Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:9 StartTimeRel:14}:{Name:kworker/u2:0-flush-254:0 Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:10 StartTimeRel:14}:{Name:mm_percpu_wq Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:11 StartTimeRel:14}:{Name:rcu_tasks_kthread Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:12 StartTimeRel:14}:{Name:rcu_tasks_rude_kthread Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:13 StartTimeRel:14}:{Name:rcu_tasks_trace_kthread Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:14 StartTimeRel:14}:{Name:ksoftirqd/0 Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:15 StartTimeRel:14}:{Name:rcu_preempt Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:16 StartTimeRel:14}:{Name:migration/0 Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:17 StartTimeRel:14}:{Name:kworker/0:1-rcu_gp Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:18 StartTimeRel:14}:{Name:cpuhp/0 Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:20 StartTimeRel:14}:{Name:kdevtmpfs Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:21 StartTimeRel:14}:{Name:inet_frag_wq Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:22 StartTimeRel:14}:{Name:kauditd Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:23 StartTimeRel:14}:{Name:khungtaskd Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:24 StartTimeRel:14}:{Name:oom_reaper Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:25 StartTimeRel:14}:{Name:kworker/u2:1-flush-254:0 Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:26 StartTimeRel:16}:{Name:kworker/u2:2-ext4-rsv-conversion Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.16 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:27 StartTimeRel:16}:{Name:writeback Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.16 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:28 StartTimeRel:16}:{Name:kcompactd0 Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.16 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:29 StartTimeRel:16}:{Name:ksmd Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.16 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:30 StartTimeRel:16}:{Name:khugepaged Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.16 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:31 StartTimeRel:16}:{Name:kintegrityd Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.16 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:32 StartTimeRel:16}:{Name:kblockd Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.16 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:33 StartTimeRel:16}:{Name:blkcg_punt_bio Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.16 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:34 StartTimeRel:19}:{Name:tpm_dev_wq Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.19 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:35 StartTimeRel:19}:{Name:edac-poller Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.19 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:36 StartTimeRel:19}:{Name:devfreq_wq Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.19 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:37 StartTimeRel:22}:{Name:kworker/0:1H-kblockd Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.22 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:38 StartTimeRel:24}:{Name:kswapd0 Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.24 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:44 StartTimeRel:42}:{Name:kthrotld Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.42 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:46 StartTimeRel:43}:{Name:acpi_thermal_pm Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.43 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:47 StartTimeRel:44}:{Name:mld Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.44 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:48 StartTimeRel:44}:{Name:ipv6_addrconf Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.44 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:53 StartTimeRel:44}:{Name:kstrp Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.44 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:58 StartTimeRel:45}:{Name:zswap-shrink Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.45 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:59 StartTimeRel:45}:{Name:kworker/u3:0 Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.45 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:114 StartTimeRel:61}:{Name:kworker/0:2-events Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.61 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:116 StartTimeRel:68}:{Name:ata_sff Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.68 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:117 StartTimeRel:68}:{Name:scsi_eh_0 Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.68 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:118 StartTimeRel:68}:{Name:scsi_tmf_0 Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.68 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:119 StartTimeRel:69}:{Name:scsi_eh_1 Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.69 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:120 StartTimeRel:69}:{Name:scsi_tmf_1 Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.69 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:121 StartTimeRel:70}:{Name:kworker/u2:3-writeback Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.7 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:122 StartTimeRel:90}:{Name:kworker/0:3-ata_sff Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.9 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:124 StartTimeRel:112}:{Name:kworker/0:2H-kblockd Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:01.12 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:154 StartTimeRel:137}:{Name:jbd2/vda1-8 Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:01.37 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:155 StartTimeRel:137}:{Name:ext4-rsv-conver Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:01.37 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:200 StartTimeRel:266}:{Name:systemd-journal Cmdline:[/lib/systemd/systemd-journald] Cgroups:[/system.slice/systemd-journald.service] ParentPid:1 StartTime:2023-12-20 21:17:02.66 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:221 StartTimeRel:276}:{Name:systemd-udevd Cmdline:[/lib/systemd/systemd-udevd] Cgroups:[/system.slice/systemd-udevd.service/udev] ParentPid:1 StartTime:2023-12-20 21:17:02.76 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:254 StartTimeRel:296}:{Name:kworker/0:4-events Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:02.96 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:336 StartTimeRel:369}:{Name:cron Cmdline:[/usr/sbin/cron -f] Cgroups:[/system.slice/cron.service] ParentPid:1 StartTime:2023-12-20 21:17:03.69 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:337 StartTimeRel:369}:{Name:dbus-daemon Cmdline:[/usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation --syslog-only] Cgroups:[/system.slice/dbus.service] ParentPid:1 StartTime:2023-12-20 21:17:03.69 +0000 UTC EffectiveUID:100}
2023/12/20 21:19:13 found new proc: {Pid:342 StartTimeRel:370}:{Name:prometheus-node Cmdline:[/usr/bin/prometheus-node-exporter] Cgroups:[/system.slice/prometheus-node-exporter.service] ParentPid:1 StartTime:2023-12-20 21:17:03.7 +0000 UTC EffectiveUID:106}
2023/12/20 21:19:13 found new proc: {Pid:343 StartTimeRel:370}:{Name:rsyslogd Cmdline:[/usr/sbin/rsyslogd -n -iNONE] Cgroups:[/system.slice/rsyslog.service] ParentPid:1 StartTime:2023-12-20 21:17:03.7 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:344 StartTimeRel:371}:{Name:systemd-logind Cmdline:[/lib/systemd/systemd-logind] Cgroups:[/system.slice/systemd-logind.service] ParentPid:1 StartTime:2023-12-20 21:17:03.71 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:345 StartTimeRel:371}:{Name:atd Cmdline:[/usr/sbin/atd -f] Cgroups:[/system.slice/atd.service] ParentPid:1 StartTime:2023-12-20 21:17:03.71 +0000 UTC EffectiveUID:1}
2023/12/20 21:19:13 found new proc: {Pid:363 StartTimeRel:375}:{Name:firewalld Cmdline:[/usr/bin/python3 /usr/sbin/firewalld --nofork --nopid] Cgroups:[/system.slice/firewalld.service] ParentPid:1 StartTime:2023-12-20 21:17:03.75 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:365 StartTimeRel:378}:{Name:ipmi-msghandler Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:03.78 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:438 StartTimeRel:440}:{Name:named Cmdline:[/usr/sbin/named -f -u bind] Cgroups:[/system.slice/named.service] ParentPid:1 StartTime:2023-12-20 21:17:04.4 +0000 UTC EffectiveUID:105}
2023/12/20 21:19:13 found new proc: {Pid:440 StartTimeRel:440}:{Name:prometheus-proc Cmdline:[/usr/bin/prometheus-process-exporter] Cgroups:[/system.slice/prometheus-process-exporter.service] ParentPid:1 StartTime:2023-12-20 21:17:04.4 +0000 UTC EffectiveUID:106}
2023/12/20 21:19:13 found new proc: {Pid:444 StartTimeRel:443}:{Name:agetty Cmdline:[/sbin/agetty -o -p -- \u --noclear - linux] Cgroups:[/system.slice/system-getty.slice/getty@tty1.service] ParentPid:1 StartTime:2023-12-20 21:17:04.43 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:445 StartTimeRel:443}:{Name:containerd Cmdline:[/usr/bin/containerd] Cgroups:[/system.slice/containerd.service] ParentPid:1 StartTime:2023-12-20 21:17:04.43 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:455 StartTimeRel:453}:{Name:sshd Cmdline:[sshd: /usr/sbin/sshd -D [listener] 0 of 10-100 startups] Cgroups:[/system.slice/ssh.service] ParentPid:1 StartTime:2023-12-20 21:17:04.53 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:456 StartTimeRel:454}:{Name:nvme-wq Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:04.54 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:459 StartTimeRel:454}:{Name:nvme-reset-wq Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:04.54 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:460 StartTimeRel:455}:{Name:nvme-delete-wq Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:04.55 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:487 StartTimeRel:478}:{Name:ntpd Cmdline:[/usr/sbin/ntpd -p /run/ntpd.pid -c /etc/ntpsec/ntp.conf -g -N -u ntpsec:ntpsec] Cgroups:[/system.slice/ntpsec.service] ParentPid:1 StartTime:2023-12-20 21:17:04.78 +0000 UTC EffectiveUID:102}
2023/12/20 21:19:13 found new proc: {Pid:551 StartTimeRel:518}:{Name:dockerd Cmdline:[/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock] Cgroups:[/system.slice/docker.service] ParentPid:1 StartTime:2023-12-20 21:17:05.18 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:671 StartTimeRel:553}:{Name:polkitd Cmdline:[/usr/lib/polkit-1/polkitd --no-debug] Cgroups:[/system.slice/polkit.service] ParentPid:1 StartTime:2023-12-20 21:17:05.53 +0000 UTC EffectiveUID:996}
2023/12/20 21:19:13 found new proc: {Pid:1062 StartTimeRel:597}:{Name:kworker/u2:4-flush-254:0 Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:05.97 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1063 StartTimeRel:597}:{Name:kworker/u2:5-flush-254:0 Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:05.97 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1064 StartTimeRel:597}:{Name:kworker/u2:6-flush-254:0 Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:05.97 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1065 StartTimeRel:597}:{Name:kworker/u2:7-events_unbound Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:05.97 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1076 StartTimeRel:599}:{Name:master Cmdline:[/usr/lib/postfix/sbin/master -w] Cgroups:[/system.slice/system-postfix.slice/postfix@-.service] ParentPid:1 StartTime:2023-12-20 21:17:05.99 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1080 StartTimeRel:600}:{Name:pickup Cmdline:[pickup -l -t unix -u -c] Cgroups:[/system.slice/system-postfix.slice/postfix@-.service] ParentPid:1076 StartTime:2023-12-20 21:17:06 +0000 UTC EffectiveUID:108}
2023/12/20 21:19:13 found new proc: {Pid:1081 StartTimeRel:600}:{Name:qmgr Cmdline:[qmgr -l -t unix -u] Cgroups:[/system.slice/system-postfix.slice/postfix@-.service] ParentPid:1076 StartTime:2023-12-20 21:17:06 +0000 UTC EffectiveUID:108}
2023/12/20 21:19:13 found new proc: {Pid:1082 StartTimeRel:600}:{Name:prometheus-post Cmdline:[/usr/bin/prometheus-postfix-exporter] Cgroups:[/system.slice/prometheus-postfix-exporter.service] ParentPid:1 StartTime:2023-12-20 21:17:06 +0000 UTC EffectiveUID:106}
2023/12/20 21:19:13 found new proc: {Pid:1197 StartTimeRel:613}:{Name:packagekitd Cmdline:[/usr/libexec/packagekitd] Cgroups:[/system.slice/packagekit.service] ParentPid:1 StartTime:2023-12-20 21:17:06.13 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1395 StartTimeRel:747}:{Name:docker-proxy Cmdline:[/usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 2019 -container-ip 172.24.0.2 -container-port 2019] Cgroups:[/system.slice/docker.service] ParentPid:551 StartTime:2023-12-20 21:17:07.47 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1405 StartTimeRel:748}:{Name:docker-proxy Cmdline:[/usr/bin/docker-proxy -proto tcp -host-ip :: -host-port 2019 -container-ip 172.24.0.2 -container-port 2019] Cgroups:[/system.slice/docker.service] ParentPid:551 StartTime:2023-12-20 21:17:07.48 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1438 StartTimeRel:751}:{Name:docker-proxy Cmdline:[/usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 443 -container-ip 172.24.0.2 -container-port 443] Cgroups:[/system.slice/docker.service] ParentPid:551 StartTime:2023-12-20 21:17:07.51 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1443 StartTimeRel:751}:{Name:docker-proxy Cmdline:[/usr/bin/docker-proxy -proto tcp -host-ip :: -host-port 443 -container-ip 172.24.0.2 -container-port 443] Cgroups:[/system.slice/docker.service] ParentPid:551 StartTime:2023-12-20 21:17:07.51 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1459 StartTimeRel:755}:{Name:docker-proxy Cmdline:[/usr/bin/docker-proxy -proto udp -host-ip 0.0.0.0 -host-port 443 -container-ip 172.24.0.2 -container-port 443] Cgroups:[/system.slice/docker.service] ParentPid:551 StartTime:2023-12-20 21:17:07.55 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1464 StartTimeRel:755}:{Name:docker-proxy Cmdline:[/usr/bin/docker-proxy -proto udp -host-ip :: -host-port 443 -container-ip 172.24.0.2 -container-port 443] Cgroups:[/system.slice/docker.service] ParentPid:551 StartTime:2023-12-20 21:17:07.55 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1479 StartTimeRel:759}:{Name:docker-proxy Cmdline:[/usr/bin/docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 80 -container-ip 172.24.0.2 -container-port 80] Cgroups:[/system.slice/docker.service] ParentPid:551 StartTime:2023-12-20 21:17:07.59 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1484 StartTimeRel:759}:{Name:docker-proxy Cmdline:[/usr/bin/docker-proxy -proto tcp -host-ip :: -host-port 80 -container-ip 172.24.0.2 -container-port 80] Cgroups:[/system.slice/docker.service] ParentPid:551 StartTime:2023-12-20 21:17:07.59 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1502 StartTimeRel:762}:{Name:containerd-shim Cmdline:[/usr/bin/containerd-shim-runc-v2 -namespace moby -id ae4e59803331fa91faf37cac25b5620b373a20ceb46bf7dd56f7f3b5618330d3 -address /run/containerd/containerd.sock] Cgroups:[/system.slice/containerd.service] ParentPid:1 StartTime:2023-12-20 21:17:07.62 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1503 StartTimeRel:762}:{Name:containerd-shim Cmdline:[/usr/bin/containerd-shim-runc-v2 -namespace moby -id b194ed0e41cec4d1d74934d7a09a688fc614ce27445fb2a8be83a51edcc96249 -address /run/containerd/containerd.sock] Cgroups:[/system.slice/containerd.service] ParentPid:1 StartTime:2023-12-20 21:17:07.62 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1534 StartTimeRel:773}:{Name:containerd-shim Cmdline:[/usr/bin/containerd-shim-runc-v2 -namespace moby -id 5b1860c0e2dedb52fae77cfa357d8049c5424920708966a48f1e18679cfaf80b -address /run/containerd/containerd.sock] Cgroups:[/system.slice/containerd.service] ParentPid:1 StartTime:2023-12-20 21:17:07.73 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1567 StartTimeRel:827}:{Name:mysqld Cmdline:[mysqld] Cgroups:[/system.slice/docker-ae4e59803331fa91faf37cac25b5620b373a20ceb46bf7dd56f7f3b5618330d3.scope] ParentPid:1502 StartTime:2023-12-20 21:17:08.27 +0000 UTC EffectiveUID:999}
2023/12/20 21:19:13 found new proc: {Pid:1574 StartTimeRel:827}:{Name:php-fpm Cmdline:[php-fpm: master process (/usr/local/etc/php-fpm.conf)] Cgroups:[/system.slice/docker-b194ed0e41cec4d1d74934d7a09a688fc614ce27445fb2a8be83a51edcc96249.scope] ParentPid:1503 StartTime:2023-12-20 21:17:08.27 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1581 StartTimeRel:828}:{Name:caddy Cmdline:[caddy run --config /etc/caddy/Caddyfile] Cgroups:[/system.slice/docker-5b1860c0e2dedb52fae77cfa357d8049c5424920708966a48f1e18679cfaf80b.scope] ParentPid:1534 StartTime:2023-12-20 21:17:08.28 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1752 StartTimeRel:956}:{Name:master Cmdline:[/usr/libexec/postfix/master -w] Cgroups:[/system.slice/docker-b194ed0e41cec4d1d74934d7a09a688fc614ce27445fb2a8be83a51edcc96249.scope] ParentPid:1574 StartTime:2023-12-20 21:17:09.56 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1753 StartTimeRel:957}:{Name:pickup Cmdline:[pickup -l -t unix -u] Cgroups:[/system.slice/docker-b194ed0e41cec4d1d74934d7a09a688fc614ce27445fb2a8be83a51edcc96249.scope] ParentPid:1752 StartTime:2023-12-20 21:17:09.57 +0000 UTC EffectiveUID:100}
2023/12/20 21:19:13 found new proc: {Pid:1754 StartTimeRel:957}:{Name:qmgr Cmdline:[qmgr -l -t unix -u] Cgroups:[/system.slice/docker-b194ed0e41cec4d1d74934d7a09a688fc614ce27445fb2a8be83a51edcc96249.scope] ParentPid:1752 StartTime:2023-12-20 21:17:09.57 +0000 UTC EffectiveUID:100}
2023/12/20 21:19:13 found new proc: {Pid:1772 StartTimeRel:1021}:{Name:php-fpm Cmdline:[php-fpm: pool www] Cgroups:[/system.slice/docker-b194ed0e41cec4d1d74934d7a09a688fc614ce27445fb2a8be83a51edcc96249.scope] ParentPid:1574 StartTime:2023-12-20 21:17:10.21 +0000 UTC EffectiveUID:82}
2023/12/20 21:19:13 found new proc: {Pid:1773 StartTimeRel:1021}:{Name:php-fpm Cmdline:[php-fpm: pool www] Cgroups:[/system.slice/docker-b194ed0e41cec4d1d74934d7a09a688fc614ce27445fb2a8be83a51edcc96249.scope] ParentPid:1574 StartTime:2023-12-20 21:17:10.21 +0000 UTC EffectiveUID:82}
2023/12/20 21:19:13 found new proc: {Pid:1903 StartTimeRel:10114}:{Name:sshd Cmdline:[sshd: root@pts/0] Cgroups:[/user.slice/user-0.slice/session-1.scope] ParentPid:455 StartTime:2023-12-20 21:18:41.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1906 StartTimeRel:10134}:{Name:systemd Cmdline:[/lib/systemd/systemd --user] Cgroups:[/user.slice/user-0.slice/user@0.service/init.scope] ParentPid:1 StartTime:2023-12-20 21:18:41.34 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1907 StartTimeRel:10135}:{Name:(sd-pam) Cmdline:[(sd-pam)] Cgroups:[/user.slice/user-0.slice/user@0.service/init.scope] ParentPid:1906 StartTime:2023-12-20 21:18:41.35 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1926 StartTimeRel:10151}:{Name:bash Cmdline:[-bash] Cgroups:[/user.slice/user-0.slice/session-1.scope] ParentPid:1903 StartTime:2023-12-20 21:18:41.51 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 found new proc: {Pid:1931 StartTimeRel:13292}:{Name:prometheus-proc Cmdline:[prometheus-process-exporter -debug -web.listen-address :9257] Cgroups:[/user.slice/user-0.slice/session-1.scope] ParentPid:1926 StartTime:2023-12-20 21:19:12.92 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 ignoring unmatched proc with no matched parent: {Pid:2 StartTimeRel:3}:{Name:kthreadd Cmdline:[] Cgroups:[/] ParentPid:0 StartTime:2023-12-20 21:17:00.03 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 ignoring unmatched proc with no matched parent: {Pid:13 StartTimeRel:14}:{Name:rcu_tasks_trace_kthread Cmdline:[] Cgroups:[/] ParentPid:2 StartTime:2023-12-20 21:17:00.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 ignoring unmatched proc with no matched parent: {Pid:1 StartTimeRel:3}:{Name:systemd Cmdline:[/sbin/init] Cgroups:[/init.scope] ParentPid:0 StartTime:2023-12-20 21:17:00.03 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 ignoring unmatched proc with no matched parent: {Pid:1503 StartTimeRel:762}:{Name:containerd-shim Cmdline:[/usr/bin/containerd-shim-runc-v2 -namespace moby -id b194ed0e41cec4d1d74934d7a09a688fc614ce27445fb2a8be83a51edcc96249 -address /run/containerd/containerd.sock] Cgroups:[/system.slice/containerd.service] ParentPid:1 StartTime:2023-12-20 21:17:07.62 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 ignoring unmatched proc with no matched parent: {Pid:1574 StartTimeRel:827}:{Name:php-fpm Cmdline:[php-fpm: master process (/usr/local/etc/php-fpm.conf)] Cgroups:[/system.slice/docker-b194ed0e41cec4d1d74934d7a09a688fc614ce27445fb2a8be83a51edcc96249.scope] ParentPid:1503 StartTime:2023-12-20 21:17:08.27 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 ignoring unmatched proc with no matched parent: {Pid:1907 StartTimeRel:10135}:{Name:(sd-pam) Cmdline:[(sd-pam)] Cgroups:[/user.slice/user-0.slice/user@0.service/init.scope] ParentPid:1906 StartTime:2023-12-20 21:18:41.35 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 ignoring unmatched proc with no matched parent: {Pid:1081 StartTimeRel:600}:{Name:qmgr Cmdline:[qmgr -l -t unix -u] Cgroups:[/system.slice/system-postfix.slice/postfix@-.service] ParentPid:1076 StartTime:2023-12-20 21:17:06 +0000 UTC EffectiveUID:108}
2023/12/20 21:19:13 ignoring unmatched proc with no matched parent: {Pid:1903 StartTimeRel:10114}:{Name:sshd Cmdline:[sshd: root@pts/0] Cgroups:[/user.slice/user-0.slice/session-1.scope] ParentPid:455 StartTime:2023-12-20 21:18:41.14 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 ignoring unmatched proc with no matched parent: {Pid:1926 StartTimeRel:10151}:{Name:bash Cmdline:[-bash] Cgroups:[/user.slice/user-0.slice/session-1.scope] ParentPid:1903 StartTime:2023-12-20 21:18:41.51 +0000 UTC EffectiveUID:0}
2023/12/20 21:19:13 ignoring unmatched proc with no matched parent: {Pid:1931 StartTimeRel:13292}:{Name:prometheus-proc Cmdline:[prometheus-process-exporter -debug -web.listen-address :9257] Cgroups:[/user.slice/user-0.slice/session-1.scope] ParentPid:1926 StartTime:2023-12-20 21:19:12.92 +0000 UTC EffectiveUID:0}
level=info ts=2023-12-20T21:19:13.430Z caller=tls_config.go:232 msg="Listening on" address=[::]:9257
level=info ts=2023-12-20T21:19:13.430Z caller=tls_config.go:235 msg="TLS is disabled." http2=false address=[::]:9257

Output from endpoint on port 9256:

# HELP go_gc_duration_seconds A summary of the pause duration of garbage collection cycles.
# TYPE go_gc_duration_seconds summary
go_gc_duration_seconds{quantile="0"} 9.107e-06
go_gc_duration_seconds{quantile="0.25"} 2.2393e-05
go_gc_duration_seconds{quantile="0.5"} 2.7552e-05
go_gc_duration_seconds{quantile="0.75"} 3.5418e-05
go_gc_duration_seconds{quantile="1"} 4.6078e-05
go_gc_duration_seconds_sum 0.000331196
go_gc_duration_seconds_count 12
# HELP go_goroutines Number of goroutines that currently exist.
# TYPE go_goroutines gauge
go_goroutines 9
# HELP go_info Information about the Go environment.
# TYPE go_info gauge
go_info{version="go1.19.8"} 1
# HELP go_memstats_alloc_bytes Number of bytes allocated and still in use.
# TYPE go_memstats_alloc_bytes gauge
go_memstats_alloc_bytes 2.101024e+06
# HELP go_memstats_alloc_bytes_total Total number of bytes allocated, even if freed.
# TYPE go_memstats_alloc_bytes_total counter
go_memstats_alloc_bytes_total 2.7378888e+07
# HELP go_memstats_buck_hash_sys_bytes Number of bytes used by the profiling bucket hash table.
# TYPE go_memstats_buck_hash_sys_bytes gauge
go_memstats_buck_hash_sys_bytes 1.454657e+06
# HELP go_memstats_frees_total Total number of frees.
# TYPE go_memstats_frees_total counter
go_memstats_frees_total 305831
# HELP go_memstats_gc_sys_bytes Number of bytes used for garbage collection system metadata.
# TYPE go_memstats_gc_sys_bytes gauge
go_memstats_gc_sys_bytes 9.257536e+06
# HELP go_memstats_heap_alloc_bytes Number of heap bytes allocated and still in use.
# TYPE go_memstats_heap_alloc_bytes gauge
go_memstats_heap_alloc_bytes 2.101024e+06
# HELP go_memstats_heap_idle_bytes Number of heap bytes waiting to be used.
# TYPE go_memstats_heap_idle_bytes gauge
go_memstats_heap_idle_bytes 5.013504e+06
# HELP go_memstats_heap_inuse_bytes Number of heap bytes that are in use.
# TYPE go_memstats_heap_inuse_bytes gauge
go_memstats_heap_inuse_bytes 3.047424e+06
# HELP go_memstats_heap_objects Number of allocated objects.
# TYPE go_memstats_heap_objects gauge
go_memstats_heap_objects 10074
# HELP go_memstats_heap_released_bytes Number of heap bytes released to OS.
# TYPE go_memstats_heap_released_bytes gauge
go_memstats_heap_released_bytes 3.801088e+06
# HELP go_memstats_heap_sys_bytes Number of heap bytes obtained from system.
# TYPE go_memstats_heap_sys_bytes gauge
go_memstats_heap_sys_bytes 8.060928e+06
# HELP go_memstats_last_gc_time_seconds Number of seconds since 1970 of last garbage collection.
# TYPE go_memstats_last_gc_time_seconds gauge
go_memstats_last_gc_time_seconds 1.7031077267780695e+09
# HELP go_memstats_lookups_total Total number of pointer lookups.
# TYPE go_memstats_lookups_total counter
go_memstats_lookups_total 0
# HELP go_memstats_mallocs_total Total number of mallocs.
# TYPE go_memstats_mallocs_total counter
go_memstats_mallocs_total 315905
# HELP go_memstats_mcache_inuse_bytes Number of bytes in use by mcache structures.
# TYPE go_memstats_mcache_inuse_bytes gauge
go_memstats_mcache_inuse_bytes 1200
# HELP go_memstats_mcache_sys_bytes Number of bytes used for mcache structures obtained from system.
# TYPE go_memstats_mcache_sys_bytes gauge
go_memstats_mcache_sys_bytes 15600
# HELP go_memstats_mspan_inuse_bytes Number of bytes in use by mspan structures.
# TYPE go_memstats_mspan_inuse_bytes gauge
go_memstats_mspan_inuse_bytes 43776
# HELP go_memstats_mspan_sys_bytes Number of bytes used for mspan structures obtained from system.
# TYPE go_memstats_mspan_sys_bytes gauge
go_memstats_mspan_sys_bytes 81360
# HELP go_memstats_next_gc_bytes Number of heap bytes when next garbage collection will take place.
# TYPE go_memstats_next_gc_bytes gauge
go_memstats_next_gc_bytes 4.194304e+06
# HELP go_memstats_other_sys_bytes Number of bytes used for other system allocations.
# TYPE go_memstats_other_sys_bytes gauge
go_memstats_other_sys_bytes 574919
# HELP go_memstats_stack_inuse_bytes Number of bytes in use by the stack allocator.
# TYPE go_memstats_stack_inuse_bytes gauge
go_memstats_stack_inuse_bytes 327680
# HELP go_memstats_stack_sys_bytes Number of bytes obtained from system for stack allocator.
# TYPE go_memstats_stack_sys_bytes gauge
go_memstats_stack_sys_bytes 327680
# HELP go_memstats_sys_bytes Number of bytes obtained from system.
# TYPE go_memstats_sys_bytes gauge
go_memstats_sys_bytes 1.977268e+07
# HELP go_threads Number of OS threads created.
# TYPE go_threads gauge
go_threads 6
# HELP namedprocess_scrape_errors general scrape errors: no proc metrics collected during a cycle
# TYPE namedprocess_scrape_errors counter
namedprocess_scrape_errors 0
# HELP namedprocess_scrape_partial_errors incremented each time a tracked proc's metrics collection fails partially, e.g. unreadable I/O stats
# TYPE namedprocess_scrape_partial_errors counter
namedprocess_scrape_partial_errors 126
# HELP namedprocess_scrape_procread_errors incremented each time a proc's metrics collection fails
# TYPE namedprocess_scrape_procread_errors counter
namedprocess_scrape_procread_errors 0
# HELP process_cpu_seconds_total Total user and system CPU time spent in seconds.
# TYPE process_cpu_seconds_total counter
process_cpu_seconds_total 0.2
# HELP process_exporter_build_info A metric with a constant '1' value labeled by version, revision, branch, goversion from which process_exporter was built, and the goos and goarch for the build.
# TYPE process_exporter_build_info gauge
process_exporter_build_info{branch="debian/sid",goarch="amd64",goos="linux",goversion="go1.19.8",revision="0.7.10-3+b5",version=""} 1
# HELP process_max_fds Maximum number of open file descriptors.
# TYPE process_max_fds gauge
process_max_fds 524288
# HELP process_open_fds Number of open file descriptors.
# TYPE process_open_fds gauge
process_open_fds 11
# HELP process_resident_memory_bytes Resident memory size in bytes.
# TYPE process_resident_memory_bytes gauge
process_resident_memory_bytes 1.5450112e+07
# HELP process_start_time_seconds Start time of the process since unix epoch in seconds.
# TYPE process_start_time_seconds gauge
process_start_time_seconds 1.7031070244e+09
# HELP process_virtual_memory_bytes Virtual memory size in bytes.
# TYPE process_virtual_memory_bytes gauge
process_virtual_memory_bytes 1.046556672e+09
# HELP process_virtual_memory_max_bytes Maximum amount of virtual memory available in bytes.
# TYPE process_virtual_memory_max_bytes gauge
process_virtual_memory_max_bytes 1.8446744073709552e+19
# HELP promhttp_metric_handler_requests_in_flight Current number of scrapes being served.
# TYPE promhttp_metric_handler_requests_in_flight gauge
promhttp_metric_handler_requests_in_flight 1
# HELP promhttp_metric_handler_requests_total Total number of scrapes by HTTP status code.
# TYPE promhttp_metric_handler_requests_total counter
promhttp_metric_handler_requests_total{code="200"} 51
promhttp_metric_handler_requests_total{code="500"} 0
promhttp_metric_handler_requests_total{code="503"} 0
@darknetehf
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Update and possible fix:

I installed the package manually from this repo instead of using the Debian package. In the releases I picked this file: process-exporter_0.7.10_linux_amd64.deb and installed it with dpkg.

It should be noted that there are differences between this package and the Debian package version.
On Debian the systemd service is named: prometheus-process-exporter.service
In ncabatoff package it is: process-exporter.service

The unit files differ as well:

On Debian:

● prometheus-process-exporter.service - Prometheus exporter that mines /proc to report on selected processes
     Loaded: loaded (/lib/systemd/system/prometheus-process-exporter.service; enabled; vendor preset: enabled)
     Active: active (running) since Wed 2023-12-20 18:27:04 GMT; 4h 5min ago
       Docs: https://github.com/ncabatoff/process-exporter
             man:prometheus-process-exporter(1)
   Main PID: 4095383 (prometheus-proc)
      Tasks: 5 (limit: 1115)
     Memory: 20.0M
        CPU: 2.980s
     CGroup: /system.slice/prometheus-process-exporter.service
             └─4095383 /usr/bin/prometheus-process-exporter

ncabatoff:

● process-exporter.service - Process Exporter for Prometheus
     Loaded: loaded (/lib/systemd/system/process-exporter.service; enabled; preset: enabled)
     Active: active (running) since Wed 2023-12-20 22:16:30 GMT; 15min ago
   Main PID: 4727 (process-exporte)
      Tasks: 5 (limit: 1108)
     Memory: 16.5M
        CPU: 3.066s
     CGroup: /system.slice/process-exporter.service
             └─4727 /usr/bin/process-exporter --config.path /etc/process-exporter/all.yaml --web.listen-address=:9256

And the EnvironmentFile directive in the systemd unit file differs as well.
The file /etc/process-exporter/all.yaml is not present when installing the Debian package. Contents:

process_names:
  - name: "{{.Comm}}"
    cmdline: 
    - '.+'

This seems to be the missing piece.

A quick fix is to create that missing all.yaml file and adapt the service CLI to use that config file:
For example this command will properly expose the metrics on port 9257:
/usr/bin/prometheus-process-exporter -debug --web.listen-address=:9257 --config.path /tmp/all.yaml

In conclusion the issue seems to be with the Debian packaging.
@darknetehf
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Quick fix for Debian package

Listing files provided by package:
apt-file list prometheus-process-exporter
Output:

prometheus-process-exporter: /etc/default/prometheus-process-exporter
prometheus-process-exporter: /etc/init.d/prometheus-process-exporter
prometheus-process-exporter: /etc/logrotate.d/prometheus-process-exporter
prometheus-process-exporter: /lib/systemd/system/prometheus-process-exporter.service
prometheus-process-exporter: /usr/bin/prometheus-process-exporter
prometheus-process-exporter: /usr/share/doc/prometheus-process-exporter/README.md.gz
prometheus-process-exporter: /usr/share/doc/prometheus-process-exporter/changelog.Debian.amd64.gz
prometheus-process-exporter: /usr/share/doc/prometheus-process-exporter/changelog.Debian.gz
prometheus-process-exporter: /usr/share/doc/prometheus-process-exporter/copyright
prometheus-process-exporter: /usr/share/doc/prometheus-process-exporter/examples/all.yaml
prometheus-process-exporter: /usr/share/man/man1/prometheus-process-exporter.1.gz

The all.yaml file is provided so it is sufficient to edit this file: /etc/default/prometheus-process-exporter as follows:
ARGS="-config.path /usr/share/doc/prometheus-process-exporter/examples/all.yaml"
Then restart the service:
systemctl restart prometheus-process-exporter
Process metrics will be returned on the /metrics endpoint on port 9256.
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