Question

A developer manages a Lambda-based order processing service whose traffic varies predictably across the day, with higher volume during business hours and much lower volume overnight. The team wants a CloudWatch alarm on the function's error count that adapts to these normal traffic patterns and only alerts when errors deviate meaningfully from expected behavior, without constant false alarms from a fixed threshold. What should the developer configure?

Accepted Answer

Create a CloudWatch alarm using anomaly detection on the Errors metric with a band based on the model, alarming when values fall outside the band.

Answer

Create a static-threshold CloudWatch alarm on the Errors metric set to a high fixed value to avoid daytime noise.

Answer

Create a CloudWatch composite alarm combining the Invocations and Duration metrics with fixed thresholds.

Answer

Enable Lambda enhanced monitoring and rely on the default dashboard graphs for manual review each morning.