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Compare previous disk usage to current to warn about filling disk
https://www.zabbix.com/forum/zabbix-help/26120-monitoring-disk-space-usage

1
((last("vfs.fs.size[c:,free]")) - ((last("vfs.fs.size[c:,free]",0,172800))-(last("vfs.fs.size[c:,free]"))))

My suggestion
\(\(r = (u(t_p) - u(t_c))/(t_c - t_p), \; t_\text{full} = - u(t_c) / r\)\)
with \(r\): rate of disk filling/emptying, \(u\): usage, \(t_{p/c}\): previous/current time, \(t_\text{full}\): time until full