Item value unknown in emails for repeating alerts

[registration_is_lame]

Sorry this post got duplicated. Moderators please delete this.

Repeated triggers {ITEM.VALUE1} becomes *UNKNOWN* after few days.

If I close the trigger manually and get a fresh alert then the value is shown but after few days (or after 10 to 50 repeated triggers later) it goes back to *UNKNOWN*.

I also have another key in the same email "{{HOSTNAME}:{TRIGGER.KEY1}.last(0)}" but they always show the value correctly.

I've checked the recent value in latest data and the value is shown.

Zabbix Server version: 3.2.0

1. {ITEM.NAME1} ({HOST.NAME1}:{ITEM.KEY1}): {ITEM.VALUE1}

1. Free disk space % on C: (HOSTNAME:vfs.fs.size[C:,pfree]): *UNKNOWN*

[volter]

That's because the value is no longer available in the history* table.