Filesystem monitoring alerts


I’m running grafana 4.2.0 with prometheus 1.5.2 datasource on docker and with slack for alerting.
I’m trying to set alerts using slack for node filesystems.
If there is only one filesystem on graph and on alerts, then everything works fine. But when I’m trying to set alerts on graph with all my filesystems (I’m setting “OR”) then still only primary filesystem is triggering alerts, others don’t.
Is it OK to set alerts for multiple filesystems in one alert config, or should I create separate graph with alerts for every single filesystem?

Can you show your alert rule? Can you not use a wildcard instead of lots of OR conditions?