You have developed an application that is putting custom metrics into Cloudwatch. You need to generate alarms on a 10 second interval based on the published metrics. Which of the following needs to be done to fulfill this requirement?

Answer options:

A.Enable basic monitoring.
B.Enable detailed monitoring.
C.Create standard resolution metrics.
D.Create high-resolution metrics.

Answer – D
This is mentioned in the AWS Documentation.
Using the existing PutMetricData API, you can now publish Custom Metrics down to 1-second resolution. This gives you more immediate visibility and greater granularity into the state and performance of your custom applications, such as observing short-lived spikes and functions. Besides, you can also alert sooner with High-Resolution Alarms, as frequently as 10-second periods. High-Resolution Alarms allow you to react and take actions faster and support the same actions available today with standard 1-minute alarms. You can add these high-resolution metrics and alarms widgets to your Dashboard, giving you easy observability of critical components. Additionally, if you use collectd to gather your metrics, you can publish these metrics to CloudWatch using our updated collectd plugin supporting high-resolution periods down to 1-second.
Options A and B are incorrect since they are more pertinent to existing services available in AWS.
Option C is incorrect. Since for such a high degree of resolution, you need to use high-resolution metrics.
For more information on high-resolution metrics, please visit the following URL-
https://aws.amazon.com/about-aws/whats-new/2017/07/amazon-cloudwatch-introduces-high-resolution-custom-metrics-and-alarms/