Exactly the same thing happens on Trusty.
The content of the mountall log is simply:
fsck from util-linux 2.20.1 /dev/sda1: clean, 121029/9707520 files, 2596272/38812672 blocks fsck from util-linux 2.20.1 /dev/sda1: clean, 121051/9707520 files, 2596257/38812672 blocks /var/log/upstart/mountall.log (END)
Exactly the same thing happens on Trusty.
The content of the mountall log is simply:
fsck from util-linux 2.20.1 upstart/ mountall. log (END)
/dev/sda1: clean, 121029/9707520 files, 2596272/38812672 blocks
fsck from util-linux 2.20.1
/dev/sda1: clean, 121051/9707520 files, 2596257/38812672 blocks
/var/log/