Not enough disk space

My latest build failed due to running out of disk space:

cp: error writing 'debian/mariadb-server-10.1//usr/bin/mysqlbinlog': No space left on device
cp: error writing 'debian/mariadb-server-10.1//usr/bin/mysqld_multi': No space left on device
cp: error writing 'debian/mariadb-server-10.1//usr/bin/mysqld_safe': No space left on device
cp: error writing 'debian/mariadb-server-10.1//usr/bin/mysqld_safe_helper': No space left on device
cp: error writing 'debian/mariadb-server-10.1//usr/bin/mysqlhotcopy': No space left on device
cp: error writing 'debian/mariadb-server-10.1//usr/bin/perror': No space left on device
cp: error writing 'debian/mariadb-server-10.1//usr/bin/replace': No space left on device
cp: error writing 'debian/mariadb-server-10.1//usr/bin/resolve_stack_dump': No space left on device

https://auto.debian.net/api/jobs/3356/log.txt

Can you please document what it the maximum disk space available in autodeb, and preferably match it to what is the limit on Debian proper build systems?