Promtail: ARM docker images are still affected by #2792 (journal input stops working after upgrading systemd to 246+)

[abferm]

Describe the bug
Promtail no longer collects journal logs after upgrading systemd/journald on ARM host
Appears to be the same as #2792, merged fix appears to only apply to AMD64 docker images, as the arm docker image does not list backports as an apt source.

To Reproduce

1. Install Docker on ARM host
2. Configure Promtail container to collect journal logs
3. Observe behavior difference between systemd versions

Expected behavior
Logs collected

Environment:

Working

• balenaOS 2.83.21
• systemd 244
• docker image: grafana/promtail:2.4.2-arm

Not Working

• balenaOS 2.95.8
• systemd 249
• docker image: grafana/promtail:2.4.2-arm

Screenshots, Promtail config, or terminal output
output of journalctl --version on working host (balenaOS 2.83.21)

systemd 244 (244.5+)
-PAM -AUDIT -SELINUX +IMA -APPARMOR -SMACK +SYSVINIT +UTMP -LIBCRYPTSETUP -GCRYPT -GNUTLS +ACL +XZ -LZ4 -SECCOMP +BLKID -ELFUTILS +KMOD -IDN2 -IDN -PCRE2 default-hierarchy=hybrid

output of journalctl --version on non-working host (balenaOS 2.95.8)

systemd 249 (249.3+)
-PAM -AUDIT -SELINUX -APPARMOR +IMA -SMACK +SECCOMP -GCRYPT -GNUTLS -OPENSSL +ACL +BLKID -CURL -ELFUTILS -FIDO2 -IDN2 -IDN -IPTC +KMOD -LIBCRYPTSETUP +LIBFDISK -PCRE2 -PWQUALITY -P11KIT -QRENCODE -BZIP2 -LZ4 -XZ -ZLIB +ZSTD -XKBCOMMON +UTMP +SYSVINIT default-hierarchy=hybrid

[slim-bean]

Are you actually running on a 32bit OS? If you're on a 64bit OS you can use the -arm64 image, or just specify promtail:2.5.0 and docker will chose the correct architecture.

As you noticed in the PR we missed the fix the 32bit arm build and would need to PR it separately for a future release.

[abferm]

Unfortunately I am currently limited to a 32-bit OS for my platform.