thanks for the follow-up!

the snmpd log shows that there's various "duplicate registrations",
which correlates with keepalived_vrrp complaining "registering pdu
failed: 263!" - this seems to be a different problem. and there's config
keys for your snmpd.conf: defaultMonitors and linkUpDownNotifications?

but for the "failed to respond to ping" issue:
if this state is active (i see it repeats every ~1 minute) - could you please 
attach strace to both processes, and observe one of these ping response 
failures?

so in two terminals, run:
  sudo strace -fys300 -o /tmp/keepalived.trace -p $(pidof keepalived)
  sudo strace -fys300 -o /tmp/snmpd.trace -p $(pidof snmpd)

just for as long as you capture 2-3 of the subagent-connected -> ping response 
failure rounds, then kill both with ^C.
then we can maybe see in the two log files whose fault it is.


generally, we need to figure out what causes this (understand or a simple 
reproducer) so we can try to find/bisect the upstream patch that fixed this, so 
we can backport it to 22.04. you could also ask upstream if they remember a fix 
:)

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https://bugs.launchpad.net/bugs/2167576

Title:
  keepalived loses connection to snmpd regularly

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