Question

A CloudOps engineer manages a customer-facing API backed by AWS Lambda behind Amazon API Gateway. Users report intermittent high latency each morning when traffic first ramps up, and CloudWatch metrics show elevated Lambda 'Init Duration' during those periods. Traffic is predictable, peaking between 8:00 AM and 6:00 PM on weekdays. The team wants to eliminate the cold-start latency during business hours while minimizing cost. What is the MOST appropriate solution?

Accepted Answer

Configure provisioned concurrency on the Lambda function and use Application Auto Scaling with scheduled scaling to raise provisioned concurrency before 8:00 AM and lower it after 6:00 PM on weekdays.

Answer

Increase the Lambda function's memory allocation to the maximum value so the function initializes faster and never experiences cold starts.

Answer

Enable reserved concurrency at a high fixed value for the function 24/7 to guarantee capacity is always available.

Answer

Create a CloudWatch alarm on the Duration metric that triggers an SNS notification so the team can manually invoke the function to keep it warm.