CloudWatch for Newbies

As a beginner looking to view your Lambda function logs in CloudWatch, you have several straightforward options:

Using the Lambda console:

1. Go to the Lambda console
2. Select your function
3. Choose the "Monitor" tab
4. View the execution results in the "Logs" section
5. You can also check the "Details" section when using the console test feature

Using the CloudWatch console:

1. Open the CloudWatch console
2. Navigate to the "Log groups" page
3. Find and select the log group for your Lambda function (it will have your function's name)
4. Click on a log stream to see the detailed logs

Using the AWS Command Line Interface (CLI): If you're comfortable with command-line tools, you can retrieve logs using the AWS CLI with the --log-type command option.

What you'll see in the logs:

• Lambda automatically logs the start and end of each function invocation
• You'll see details like request ID, duration, memory usage, and more
• Any console.log statements (or equivalent in your programming language) will appear in these logs

Each log stream corresponds to an instance of your function, and AWS Lambda automatically monitors and sends these logs to CloudWatch without any additional setup required on your part.
Sources
Log and monitor Go Lambda functions - AWS Lambda
Viewing CloudWatch logs for Lambda functions - AWS Lambda
Log and monitor Node.js Lambda functions - AWS Lambda
Working with Lambda function logs - AWS Lambda