A. Use the Amazon CloudWatch Synthetics canary functionality to call the API and check the responses and duration of the request. Most Voted
B. Use a custom health check in the API that queries hosts to check the duration of the request.
C. Implement a custom AWS Lambda function with an Amazon EventBridge event to periodically call the API and check the responses and duration of the request.
D. Use the built-in API Gateway metrics to monitor the average duration of the API response.

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