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CloudWatch

  • CloudWatch provides metrics for every service in AWS.
  • Dimension is an attribute (instance id, env, etc.) of a metric (30 dimensions per metric)
  • Metrics hae timestams.
  • Can create CloudWatch dashboards of metrics.

Metric Streams​

Logs​

  • Log Groups, Log Stream
  • Can define expiration policies.
  • Encryption by default
  • Can setup KMS based encryption with own keys.

Sources​

  • SDK, Elastic Beanstalk
  • ECS, AWS Lambda, PC Flow Logs, API Gateway, Route 53

Logs Subscriptions​

Logs for EC2​

  • By default no logs go from EC2 to CloudWatch.
  • Need to run CloudWatch agent to push log files.
  • Make sure IAM permissions are correct.

Agent​

  • CloudWatch Logs Agent: Only send to CloudWatch Logs
  • CloudWatch Unified Agent: Collection additional system-level metrics such as RAM, processes etc.

Alarms​

  • Trigger notification for any metric.
  • Alarm States: OK, INSUFFICIENT_DATA, ALARM

Targets​

  • Actions on EC2 instances, Auto Scaling Action, Send notification to SNS.

Composite Alarms​

  • Monitoring states of multiple other alarms.

CloudWatch Container Insights​

  • ECS, EKS, Kubernetes on EC2, Fargate, needs agent for Kubernetes.
  • Metrics and logs

CloudWatch Lambda Insights​

  • Detailed metrics to troubleshoot serverless applications

CloudWatch Contributors Insights​

  • Find “Top-N” Contributors through CloudWatch Logs

CloudWatch Application Insights​

  • Automatic dashboard to troubleshoot your application and related AWS service.