Documentation says:

The following macros may be used in event tags:

• {ITEM.VALUE}, {ITEM.LASTVALUE}, {HOST.HOST}, {HOST.NAME}, {HOST.CONN}, {HOST.DNS}, {HOST.IP}, {HOST.PORT} and {HOST.ID} macros can be used to populate the tag name or tag value.
• {INVENTORY.*} macros can be used to reference host inventory values from one or several hosts in a trigger expression (supported since 4.0.0).
• User macros and user macro context is supported for the tag name/value. User macro context may include low-level discovery macros.
• Low-level discovery macros can be used for the tag name/value in trigger prototypes.
• {EVENT.TAGS} and {EVENT.RECOVERY.TAGS} macros can be used in trigger-based notifications and they will resolve to a comma separated list of event tags or recovery event tags.

I assume the last item in the list was supposed to be an independent paragraph.