We also need to drop _counters table.
I would suggest the same procedure as done at T132837
It looks like _counters table are also empty as per:
for i in `mysql -hdb1015 -e "show databases;" -AB `; do echo ***$i***; mysql -hdb1015 -e "select count(*) from $i._counters;";done
A traffic capture also suggests nothing is attempting to read from it.
Probably renaming the table and leave it like that for a couple of days is a good and safe approach, so I would be executing this later
for i in `mysql -hdb1015 -e "show databases;" -AB `; do echo ***$i***; mysql -hdb1015 $i -e "rename table _counters to TO_DROP__counters";done