Why Doesn't EC2 Show Memory Usage in CloudWatch?

CPU and network metrics are available by default, but EC2 memory usage requires the CloudWatch Agent.

A practical setup looks like:

EC2 → CloudWatch Agent → Memory Metrics → CloudWatch Alarm → Slack

You can also manage the monitoring and alarms with Terraform instead of configuring everything manually.

This is useful when you want to catch memory pressure before it becomes an application or instance problem.

EC2 Memory Not Showing? Fix It with CloudWatch Agent

If you can’t see EC2 memory usage in CloudWatch, you’re not alone. Here’s how to fix missing RAM metrics and avoid performance issues.

kubeblogs.com

How do you monitor EC2 memory in your AWS environments?