Zabbix 2.4.4 (latest).

Trying to separate one template into 2 parts ("basic" and "extra") to avoid unnecessary (extra) counters gathering while server is not engaged in production (and in the same time to keep basic monitoring).

Creating 2 templates "basic" and "extra". For both templates would like to use "Mounted filesystem discovery" (based on "vfs.fs.discovery" key), but to create absolutely different key (and graphs and trigger) prototypes.

However, when I try to apply both templates to the same host, I get error:
"Template "extra" with item key "vfs.fs.discovery" already linked to host."

This is quite a strange restriction - based not on value key, but on discovery key. I cannot easily invent relevant workaround, I guess this is not a correct behaviour.