Setup pipeline stage slack notifications to send to specific slack channels (pipeline with multiple stages)

Yes, it is possible to configure a CDK pipeline with multiple stages to send notifications to different Slack channels for each stage.

Here is an example of how you can do it in CDK:

const pipeline = new pipelines.CdkPipeline(this, 'Pipeline', {
  pipelineName: 'MyAppPipeline',
  
  stages: [
    {
      stageName: 'Source',
      actions: [/* source actions */],
      notifications: [
        new pipelines.SlackApproval(this, 'SourceSlackApproval', {
          notificationTopic: new sns.Topic(this, 'SourceTopic'),
          slackChannel: 'source-updates' 
        })  
      ]
    },
    {
      stageName: 'Build',
      actions: [/* build actions */], 
      notifications: [
        new pipelines.SlackApproval(this, 'BuildSlackApproval', {
          notificationTopic: new sns.Topic(this, 'BuildTopic'),
          slackChannel: 'build-notifications'
        })
      ]
    }
  ]
});

// Create SNS topic subscriptions
pipeline.stages[0].notifications[0].notificationTopic.subscribeUrl('https://hooks.slack.com/...'); 

pipeline.stages[1].notifications[0].notificationTopic.subscribeUrl('https://hooks.slack.com/...');

The key points:

• Each stage can define its own notifications array with a SlackApproval

• The SlackApproval is configured with a different SNS topic and slackChannel per stage

• The SNS topics are then subscribed to separate Slack webhook URLs

This allows full customization of notifications for each stage in a CDK pipeline. The same approach could also be used for sending emails, PagerDuty alerts etc. per stage.