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CloudWatch Metrics

  • CloudWatch provides metrics for every service in AWS
  • Metric is a variable to monitor (CPUUtilization, NetworkIn...)
  • Metrics belong to namespaces
  • Dimension is an attribute of a metric (instance id, environment etc)
  • Up to 10 dimensions per metric
  • Metrics have timestamps
  • Can create CloudWatch dashboards of metrics

EC2 Detailed Monitoring

  • EC2 instance metrics have metrics every 5 minutes
  • With detailed monitoring (for a cost), you get data every 1 minute
  • Use detailed monitoring if you want to scale faster your ASG
  • The AWS Free Tier allows us to have 10 detailed monitoring metrics
  • Note: EC2 Memory usage is by default not pushed (must be pushed from inside the instance as custom metric).