serverless/docs/providers/aws/events/cloudwatch-event.md

Read this on the main serverless docs site

CloudWatch Event

Simple event definition

This will enable your Lambda function to be called by an EC2 event rule. Please check the page of Event Types for CloudWatch Events.

functions:
  myCloudWatch:
    handler: myCloudWatch.handler
    events:
      - cloudwatchEvent:
          event:
            source:
              - "aws.ec2"
            detail-type:
              - "EC2 Instance State-change Notification"
            detail:
              state:
                - pending

Enabling / Disabling

Note: cloudwatchEvent events are enabled by default.

This will create and attach a disabled cloudwatchEvent event for the myCloudWatch function.

functions:
  myCloudWatch:
    handler: myCloudWatch.handler
    events:
      - cloudwatchEvent:
          event:
            source:
              - "aws.ec2"
            detail-type:
              - "EC2 Instance State-change Notification"
            detail:
              state:
                - pending
          enabled: false

Specify Input or Inputpath

You can specify input values ​​to the Lambda function.

functions:
  myCloudWatch:
    handler: myCloudWatch.handler
    events:
      - cloudwatchEvent:
          event:
            source:
              - "aws.ec2"
            detail-type:
              - "EC2 Instance State-change Notification"
            detail:
              state:
                - pending
          input:
            key1: value1
            key2: value2
            stageParams:
              stage: dev
      - cloudwatchEvent:
          event:
            source:
              - "aws.ec2"
            detail-type:
              - "EC2 Instance State-change Notification"
            detail:
              state:
                - pending
          inputPath: '$.stageVariables'