cloudwatch

1# AWS CloudWatch
2 
3Amazon 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.
4 
5## Table of Contents
6 
7- [Core Concepts](#core-concepts)
8- [Common Patterns](#common-patterns)
9- [CLI Reference](#cli-reference)
10- [Best Practices](#best-practices)
11- [Troubleshooting](#troubleshooting)
12- [References](#references)
13 
14## Core Concepts
15 
16### Metrics
17 
18Time-ordered data points published to CloudWatch. Key components:
19- **Namespace**: Container for metrics (e.g., `AWS/Lambda`)
20- **Metric name**: Name of the measurement (e.g., `Invocations`)
21- **Dimensions**: Name-value pairs for filtering (e.g., `FunctionName=MyFunc`)
22- **Statistics**: Aggregations (Sum, Average, Min, Max, SampleCount, pN)
23 
24### Logs
25 
26Log data from AWS services and applications:
27- **Log groups**: Collections of log streams
28- **Log streams**: Sequences of log events from same source
29- **Log events**: Individual log entries with timestamp and message
30 
31### Alarms
32 
33Automated actions based on metric thresholds:
34- **States**: OK, ALARM, INSUFFICIENT_DATA
35- **Actions**: SNS notifications, Lambda functions, Auto Scaling, EC2 actions, Systems Manager OpsItems
36- **Types**: metric (incl. metric math, anomaly detection, Metrics Insights), composite, log (scheduled Logs Insights query evaluated M-out-of-N on query results)
37…