I think

{EVENT.ACK.HISTORY} should be avaiable on Recovery message, so, when something gets back ok I can know if was someone who make something or the issue has just finished by itself.
I tried to use this as recovery message, but, {EVENT.ACK.HISTORY}

comes empty:

Trigger:

{TRIGGER.NAME}

Trigger status:

{TRIGGER.STATUS}

Trigger severity:

{TRIGGER.SEVERITY}

Event Date:

{EVENT.DATE}

Item values:

1.

{ITEM.NAME1}

(

{HOST.NAME1}

:

{ITEM.KEY1}

):

{ITEM.VALUE1}

Issue History:
{EVENT.ACK.HISTORY