FIXED

on the backup DHCP server I kept seeing

Apr 10 11:10:08 dhcp-backup kernel: [   86.045487] audit: type=1400 
audit(1586513408.708:44): apparmor="DENIED" operation="open" 
profile="/usr/sbin/dhcpd" name="/proc/1404/task/1417/comm" pid=1404 
comm="dhcpd" requested_mask="w" denied_mask="w" fsuid=0 ouid=0
Apr 10 11:10:08 dhcp-backup kernel: [   86.047925] audit: type=1400 
audit(1586513408.708:45): apparmor="DENIED" operation="open" 
profile="/usr/sbin/dhcpd" name="/proc/1404/task/1418/comm" pid=1404 
comm="dhcpd" requested_mask="w" denied_mask="w" fsuid=0 ouid=0
Apr 10 11:10:08 dhcp-backup kernel: [   86.048075] audit: type=1400 
audit(1586513408.708:46): apparmor="DENIED" operation="open" 
profile="/usr/sbin/dhcpd" name="/proc/1404/task/1419/comm" pid=1404 
comm="dhcpd" requested_mask="w" denied_mask="w" fsuid=0 ouid=0

Changing 
/etc/apparmor.d/usr.sbin.dhcpd

 # owner @{PROC}/[0-9]*/task/[0-9]*/comm r,
  owner @{PROC}/[0-9]*/task/[0-9]*/comm rw,

then reloading the policy into the kernel with: sudo apparmor_parser -r
/etc/apparmor.d/usr.sbin.dhcpd

resolved the issue

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https://bugs.launchpad.net/bugs/1870729

Title:
  DHCP Server regularly killed code=killed, status=6/ABRT

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