When the devuan installer created the filesystem for my / mountpoint
ext4 file system, it set the parameters 'max-mount-counts' to -1 and
'interval-between-checks' to 0, meaning that the root filesystem would
only be checked by manual sysadmin intervention.
>From the 'tune2fs' man page:
"It is strongly recommended that either -c (mount-count-dependent) or -i
(time-dependent) checking be enabled to force periodic full e2fsck(8)
checking of the filesystem."