When attempting to retrieve a DNS TLSA record using the Zabbix Agent, the agent reports it is invalid.
Example:

net.dns.record[{$DNS_SERVER_IP},_25._tcp.mail.domain.com,TLSA,15,1]

When testing the item, it reports:

Invalid third parameter, unknown dns type TLSA.

This should be supported.
TLSA is a valid DNS record type.
See: https://en.wikipedia.org/wiki/DNS-based_Authentication_of_Named_Entities#TLSA_RR
or
RFC: https://www.rfc-editor.org/rfc/rfc6698