Issue while running a custom alert script in Zabbix

[dgiripra]

Hi folks,

I'm trying to send events from Zabbix to Kafka via Logstash using a custom alert script. I have defined a python script in the /usr/lib/zabbix/alertscripts folder. In the script parameters, I'm using a macro {ALERT.MESSAGE}. I'm trying to pass a custom message which I would like to receive in Kafka. But I'm facing a KeyError and unable to successfully run the python script.

I have defined the Custom message in Configurations -> Actions -> Operations.

Below is the Custom message I have used:
[zabbix_data]
message_type=default
action_id={ACTION.ID}
action_name={ACTION.NAME}
date={DATE}
esc_history={ESC.HISTORY}

Error I'm getting is as below:
Traceback (most recent call last):
File "/usr/lib/zabbix/alertscripts/logstashAlerts.py", line 32, in <module>
json_data = json.dumps(config._sections['zabbix_data'])
KeyError: 'zabbix_data'

On looking at the documentation, I see that

{ALERT.MESSAGE}

→ Alert script parameters

'Default message' value from action configuration. Supported since 3.0.0.

But I'm not able to find Default message in Zabbix 6 under Actions. Could anyone guide me to the right direction.

Regards
Divya