docs-v2/content/kapacitor/v1/reference/event_handlers/publish.md

title	list_title	description	menu	aliases
Publish event handler	Publish	The "publish" event handler allows you to publish Kapacitor alerts messages to multiple Kapacitor topics. This page includes options and usage examples.	kapacitor_v1 name weight parent Publish 1200 Event handlers	/kapacitor/v1/event_handlers/publish/

The publish event handler publishes events to another topic.

Options

The following publish event handler options can be set in a handler file.

Name	Type	Description
topics	list of string	List of topic names to publish events.

Example: handler file

id: handler-id
topic: topic-name
kind: publish
options:
  topics:
    - system
    - ops_team

Using the publish event handler

The following setup sends an alert to the cpu topic with the message, "Hey, check your CPU". A publish handler is added that subscribes to the cpu topic and publishes new alerts to other topics.

Create a TICKscript that publishes alert messages to a topic. The TICKscript below sends an alert message to the cpu topic any time idle CPU usage drops below 10%.

cpu_alert.tick

stream
  |from()
    .measurement('cpu')
  |alert()
    .crit(lambda: "usage_idle" < 10)
    .message('Hey, check your CPU')
    .topic('cpu')

Add and enable the TICKscript:

kapacitor define cpu_alert -tick cpu_alert.tick
kapacitor enable cpu_alert

Create a handler file that subscribes to the cpu topic and uses the publish event handler to publish alerts to other topics.

publish_cpu_alerts_handler.yaml

id: publish-cpu-alert
topic: cpu
kind: publish
options:
  topics:
    - system
    - ops_team

Add the handler:

kapacitor define-topic-handler publish_cpu_alerts_handler.yaml