I want to receive notifications from AWS Eventbridge when there's a scheduled event for my Amazon Elastic Compute Cloud (Amazon EC2) instance.

I created an Eventbridge rule and set the target to an already working SNS topic. The SNS topic is subscribed to a working Lambda function that is used for other "Cloudwatch to slack" alarms already. The eventbridge setting is as follows:

{
  "source": ["aws.health"],
  "detail-type": ["AWS Health Event"],
  "detail": {
    "service": ["EC2"],
    "eventTypeCategory": ["scheduledChange"]
  }
}

I already got an EC2 scheduled maintenance(reboot) notification as e-mail from AWS, but this eventbridge I created did not trigger for that and did not send any notification to the slack channel.

I am unsure now if I am missing something in the setting. I am setting it for the first time and no way to simply test it with fake input. It is supposed to work even if there is a single schedule event that appears in the top bell icon(as shown in the screenshot above), correct?

CodePudding user response：

In order to find out the root cause of this issue, I suggest to take a look a the CloudWatch usage metrics for SNS. SNS reports the following metrics which might be useful for you: NumberOfMessagesPublished, NumberOfNotificationsDelivered NumberOfNotificationsFailed. If you find these metrics reported an they have a value different than 0, this means that SNS receives events from Event Bridge and the problem is somewhere else.

If you are using a Lambda to send messages to Slack, you should take a look at the logs in CloudWatch to see if the Lambda did execute successfully. You might want to check out the setup for Lambda recommended by AWS: (link)

For further debugging you may want to check out test-event-pattern CLI command.

It is supposed to work even if there is a single schedule event that appears in the top bell icon(as shown in the screenshot above), correct?

Yeah, it supposed to work even if there already is an event.