quotagrpadmins man page
quotagrpadmins — users responsible for group disk usage
The quotagrpadmins file lists administrators of user groups who will receive a warning if warnquota --group command finds a group exceeding its disk usage limits.
Each line consists of a group name followed by a colon and a user name. White space characters surrounding the names are allowed. Empty lines or lines starting with a hash sign or a semicolon are ignored.
list of group administrators