Zimbra: How to solve InnoDB: Error: Column last_update in table “mysql”.”innodb_table_stats”

Hello everyone, for the last couple of days I've been receiving notifications from my monitoring systems about disk issues on one of my Zimbra Servers. The system is an old one I had with Zimbra Collaboration 8.6, and from there it has been upgraded to 8.7, 8.7.1 and 8.7.6 and finally to 8.7.10.

Finding the disk issue

I've started with the basics, what directory or file was eating my disk space without my knowledge? To do that, I've used the commands df and du, both always handy:Checking that my disk was 100% full
df -h
Filesystem                 Size  Used Avail Use% Mounted on
udev                       2.0G  4.0K  2.0G   1% /dev
tmpfs                      396M  356K  395M   1% /run
/dev/disk/by-label/DOROOT   59G   56G  4.0K 100% /
none                       4.0K     0  4.0K   0% /sys/fs/cgroup
none                       5.0M     0  5.0M   0% /run/lock
none                       2.0G     0  2.0G   0% /run/shm
none                       100M     0  100M   0% /run/user