🔷
CloudWatch Metrics
- CloudWatch automatically provides metrics for AWS services (e.g.,
CPUUtilization for EC2, ReadIOPS for RDS).
- A metric is a time-ordered set of data points to monitor a resource or application variable.
- Metrics are grouped in namespaces (e.g.,
AWS/EC2, AWS/Lambda).
- Dimensions are name/value pairs that describe a metric (e.g.,
InstanceId=i-123456). - Each metric can have up to 30 dimensions.
- Each data point in a metric has:
- Value
- Timestamp
- Optional unit
- Supports 1-minute standard granularity and 1-second high-resolution metrics.
- Custom Metrics can be created to track non-default variables (e.g., RAM usage, application-specific KPIs).
- CloudWatch Dashboards allow visualization of metrics across regions and services in a single view.
- Metrics can be used in CloudWatch Alarms for automated actions (e.g., scale up/down, send SNS notification).