\var\log full

[MajStealth]

i updated the opening post with the so far "solution"

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root@OPNsense:/ # zpool status zroot
  pool: zroot
state: ONLINE
  scan: scrub repaired 0B in 00:00:02 with 0 errors on Fri Apr 28 09:59:59 2023
config:

        NAME        STATE     READ WRITE CKSUM
        zroot       ONLINE       0     0     0
          da0p4     ONLINE       0     0     0

errors: No known data errors

so space is available, the zpool/filesystem is healthy and clean - but it still does not want to boot as normal

[MajStealth]

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root@OPNsense:/ # zfs get mountpoint
NAME                PROPERTY    VALUE                   SOURCE
zroot               mountpoint  /tmp/staging/zroot      local
zroot/ROOT          mountpoint  none                    local
zroot/ROOT/default  mountpoint  /tmp/staging            local
zroot/tmp           mountpoint  /tmp/staging/tmp        local
zroot/usr           mountpoint  /tmp/staging/usr        local
zroot/usr/home      mountpoint  /tmp/staging/usr/home   inherited from zroot/usr
zroot/usr/ports     mountpoint  /tmp/staging/usr/ports  inherited from zroot/usr
zroot/usr/src       mountpoint  /tmp/staging/usr/src    inherited from zroot/usr
zroot/var           mountpoint  /tmp/staging/var        local
zroot/var/audit     mountpoint  /tmp/staging/var/audit  inherited from zroot/var
zroot/var/crash     mountpoint  /tmp/staging/var/crash  inherited from zroot/var
zroot/var/log       mountpoint  /tmp/staging/var/log    inherited from zroot/var
zroot/var/mail      mountpoint  /tmp/staging/var/mail   inherited from zroot/var
zroot/var/tmp       mountpoint  /tmp/staging/var/tmp    inherited from zroot/var
root@OPNsense:/ # zfs get canmount
NAME                PROPERTY  VALUE     SOURCE
zroot               canmount  on        default
zroot/ROOT          canmount  on        default
zroot/ROOT/default  canmount  noauto    local
zroot/tmp           canmount  on        default
zroot/usr           canmount  off       local
zroot/usr/home      canmount  on        default
zroot/usr/ports     canmount  on        default
zroot/usr/src       canmount  on        default
zroot/var           canmount  off       local
zroot/var/audit     canmount  on        default
zroot/var/crash     canmount  on        default
zroot/var/log       canmount  on        default
zroot/var/mail      canmount  on        default
zroot/var/tmp       canmount  on        default


going by https://forums.freebsd.org/threads/zfs-boot-issue.81284/ that should be looking good so far, also did not change a thing. the efi boot partition was never full though. i will need to test more over the long weekend