Your company has an e-commerce platform that is expanding all over the globe. You have EC2 instances deployed in multiple regions. You want to monitor the performance of all of these EC2 instances. How will you set up CloudWatch to monitor EC2 instances in multiple regions?

Answer options:

A.Create separate dashboards in every region.
B.Register instances running on different regions to CloudWatch.
C.Have one single dashboard that reports the metrics from CloudWatch pertaining to different regions.
D.This is not possible.

Answer – C
You can monitor AWS resources in multiple regions using a single CloudWatch dashboard. For example, you can create a dashboard that shows CPU utilization for an EC2 instance located in the us-west-2 region with your billing metrics, which are located in the us-east-1 region.
Please see the following snapshot which shows how a global CloudWatch Dashboard looks.
For more information on the Cloudwatch dashboard, please refer to the below URLs-
Nov 8 2019 new anouncement:https://aws.amazon.com/about-aws/whats-new/2019/11/amazon-cloudwatch-launches-cross-account-cross-region-dashboards/
Cross-region cross-account console:https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/Cross-Account-Cross-Region.html
Cross-Account Cross-Region Dashboards with Amazon CloudWatch: https://aws.amazon.com/blogs/aws/cross-account-cross-region-dashboards-with-amazon-cloudwatch/