Illegal instruction when trying to run metronome or rspamd on Raspi v1

My YunoHost server

Hardware: Raspberry Pi at home
YunoHost version: 3.8.5.6
I have access to my server : Through SSH, through the webadmin and direct access via keyboard / screen
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no (install via official Raspian image from yunohost.org)

Description of my issue

Diagnosis tells me metronome and rspamd are failed processes:

  - Aug 02 19:47:56 systemd[1]: Starting LSB: Metronome XMPP Server...
  - -- Subject: Unit metronome.service has begun start-up
  - -- Defined-By: systemd
  - -- Support: https://www.debian.org/support
  - -- 
  - -- Unit metronome.service has begun starting up.
  - Aug 02 19:47:56 metronome[11156]: Starting Metronome XMPP Server: metronomeIllegal instruction
  - Aug 02 19:47:56 metronome[11156]:  failed!
  - Aug 02 19:47:56 systemd[1]: metronome.service: Control process exited, code=exited status=1
  - Aug 02 19:47:56 systemd[1]: Failed to start LSB: Metronome XMPP Server.
  - -- Subject: Unit metronome.service has failed
  - -- Defined-By: systemd
  - -- Support: https://www.debian.org/support
  - -- 
  - -- Unit metronome.service has failed.
  - -- 
  - -- The result is failed.
  - Aug 02 19:47:56 systemd[1]: metronome.service: Unit entered failed state.
  - Aug 02 19:47:56 systemd[1]: metronome.service: Failed with result 'exit-code'.

  - Aug 02 19:32:31 systemd[1]: Started rapid spam filtering system.
  - -- Subject: Unit rspamd.service has finished start-up
  - -- Defined-By: systemd
  - -- Support: https://www.debian.org/support
  - -- 
  - -- Unit rspamd.service has finished starting up.
  - -- 
  - -- The start-up result is done.
  - Aug 02 19:32:31 systemd[1]: rspamd.service: Main process exited, code=killed, status=4/ILL
  - Aug 02 19:32:31 systemd[1]: rspamd.service: Unit entered failed state.
  - Aug 02 19:32:31 systemd[1]: rspamd.service: Failed with result 'signal'.
  - Aug 02 19:32:31 systemd[1]: rspamd.service: Service hold-off time over, scheduling restart.
  - Aug 02 19:32:31 systemd[1]: Stopped rapid spam filtering system.
  - -- Subject: Unit rspamd.service has finished shutting down
  - -- Defined-By: systemd
  - -- Support: https://www.debian.org/support
  - -- 
  - -- Unit rspamd.service has finished shutting down.

Indeed if I run those manually I get an Illegal Instruction error:

# metronomectl start
Illegal instruction

# /usr/bin/rspamd -c /etc/rspamd/rspamd.conf -f
Illegal instruction

I found a similar issue from 2019 but it seems it does not provide a solution (as far as my little French goes)…

Another one at Github suggests either to link metronome to /usr/bin/true to prevent the error (but of course the service is in fact not running) or to use an older Raspian kernel (which I am neither sure whether nor how to do)…

Not sure how to move on… any further suggestions?

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