Description:

There is a behavioral difference between Zabbix 7.4 and the current master branch when processing long MQTT messages in mqtt.get items with topics containing “/”.

In master:

• The full message is not displayed in the hint box and History in Latest data (it appears truncated).

In Zabbix 7.4:

• The full message is correctly displayed in both the hint box and History in Latest data.

Precondition:

Message broker should be set up

Steps to reproduce:

1. Go to "Host" 
2. Create item
   1. Type: "Zabbix agent (active)"
   2. Key: mqtt.get[localhost,"test/b"]
3. Click "Update"
4. Send long message to Item (300 characters)
5. Go to "Latest data" and check message in hint box and History

Result:

Full message is not shown in hint box and History in Latest data on master

Please see screencast:

Expected:
Full message should be displayed