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How to Monitor Serverless Applications With AWS CloudWatch Alarms with CloudWatch. CloudWatch gathers basic metrics allowing you to observe how your system is performing. You can configure a CloudWatch alarm to trigger an SNS topic in case a predefined condition is met. That SNS trigger can then invoke a Lambda function which will take action to either notify or possibly fix the situation. You will need to use the CloudWatch Logs subscription then match entries with a specific error pattern in your logs.