Configuring a Message Notification

Log in to the SMN console, choose Topic Management > Topics, and click Create Topic.
Set the topic information, and click OK.
- Topic Name: Enter AStoFunctionGraph.
- Enterprise Project: Select default or another one.
  Figure 1 Creating a topic
Log in to the AS console, go to the details page of the target AS group, click the Lifecycle Hooks tab, and then click Add Lifecycle Hook.
Figure 2 Lifecycle hooks
Configure the lifecycle hook information, and click OK. This hook is used to suspend the scaled-in instances and send a message to the specified SMN topic.
- Hook Type: Select Instance removal.
- Default Callback Action: Select Continue.
- Timeout Duration: Enter 300.
- Notification Topic: Select AStoFunctionGraph.
  Figure 3 Creating a lifecycle hook
Go to the FunctionGraph console. On the details page of function as_graceful_shutdown, choose Configuration > Triggers, and click Create Trigger.
Select SMN for the trigger type and AStoFunctionGraph for the topic. Then the messages received by this topic will trigger the handler function.
Figure 4 Creating a trigger