promtail ARM64 binary not compiled with systemd journal support

[clothespin]

Describe the bug
The arm64 binary release of Promtail is not compiled with systemd journal support. As a result, configuring the scrape_configs to scrape the systemd journal fails.
To Reproduce

1. Created the following config YAML on an arm64 (Rock64) host:
2. Downloaded the latest release of the promtail binary for arm64.
3. Started promtail with the given config YAML
4. Promtail prints the following warning: level=warn ts=2021-09-25T02:50:22.501062921Z caller=journaltargetmanager.go:29 msg="WARNING!!! Journal target was configured but support for reading the systemd journal is not compiled into this build of promtail!"

Expected behavior
Promtail correctly forwards systemd logs to the Loki instance.

Environment:
Bare metal running on Debian (Armbian) Buster.

Screenshots, Promtail config, or terminal output

System info:

$ uname -a
Linux balboa 5.10.63-rockchip64 #21.08.2 SMP PREEMPT Wed Sep 8 10:57:23 UTC 2021 aarch64 GNU/Linux
$ cat /etc/issue
Armbian 21.02.3 Buster \l
$ cat /etc/debian_version
10.10

Config:

server:
  http_listen_port: 9080
  grpc_listen_port: 0

positions:
  filename: /tmp/positions.yaml

clients:
  - url: http://REDACTED/loki/api/v1/push

scrape_configs:
  - job_name: journal
    journal:
      max_age: 12h
      labels:
        job: systemd-journal
    relabel_configs:
      - source_labels: ['__journal__systemd_unit']
        target_label: 'unit'
      - source_labels: ['__journal__hostname']
        target_label: 'host'
      - source_labels: ['__journal__cmdline']
        target_label: 'cmdline'
      - source_labels: ['__journal__boot_id']
        target_label: 'boot_id'
      - source_labels: ['__journal__machine_id']
        target_label: 'machine_id'

Output:

level=warn ts=2021-09-25T03:05:41.255366157Z caller=journaltargetmanager.go:29 msg="WARNING!!! Journal target was configured but support for reading the systemd journal is not compiled into this build of promtail!"

[rgl]

Can we have Journal support? Pretty Please? In my case, its for Raspberry Pi :-)

PS This seems to be a duplicate of #1459, so maybe this issue should be closed?

[kavirajk]

Yes. its definitely duplicate of #1459. Closing this. Feel free to re-open if anyone this otherwise!

[damm]

@rgl if you build promtail, it can scrape the systemd journal. I know because that is what I do on each release :/

It Would be amazing if the release supported systemd journals.