and this will just ignore tmpfs overlay no matter the name

roles/collectd/base/templates/collectd.conf.j2

@@ -45,14 +45,8 @@ LoadPlugin vmem
 </Plugin>
 
 <Plugin "df">
-  Interface "/var/lib/docker"
-  Interface "/run/user"
-  Interface "/tmp/tweak"
-  Interface "/mnt/fedora_koji"
-  Interface "/var/lib/mock/fedora"
-  Interface "/tmp/iso/mount"
-  Interface "/^var-lib-origin-openshift/"
-  Interface "/^.*\.snapshot/"
+  FSType "tmpfs"
+  FSType "overlay"
   IgnoreSelected true
 </Plugin>