cloudwatch

# AWS CloudWatch Amazon CloudWatch provides monitoring and observability for AWS resources and applications. It collects metrics, logs, and events, enabling you to monitor, troubleshoot, and optimize your AWS environment. ## Table of Contents - [Core Concepts](#core-concepts) - [Common Patterns](#common-patterns) - [CLI Reference](#cli-reference) - [Best Practices](#best-practices) - [Troubleshooting](#troubleshooting) - [References](#references) ## Core Concepts ### Metrics Time-ordered data points published to CloudWatch. Key components: - **Namespace**: Container for metrics (e.g., `AWS/Lambda`) - **Metric name**: Name of the measurement (e.g., `Invocations`) - **Dimensions**: Name-value pairs for filtering (e.g., `FunctionName=MyFunc`) - **Statistics**: Aggregations (Sum, Average, Min, Max, SampleCount, pN) ### Logs Log data from AWS services and applications: - **Log groups**: Collections of log streams - **Log streams**: Sequences of log events from same source - **Log events**: Individual log entries with timestamp and message ### Alarms Automated actions based on metric thresholds: - **States**: OK, ALARM, INSUFFICIENT_DATA - **Actions**: SNS notifications, Auto Scaling, EC2 actions ## Common Patterns ### Create a Metric Alarm **AWS CLI:** ```bash # CPU utilization alarm for EC2 aws cloudwatch put-metric-alarm \ --alarm-name "HighCPU-i-1234567890abcdef0" \ --metric-name CPUUtilization \ --namespace AWS/EC2 \ --statistic Average \ --period 300 \...