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CTHFM: AWS
  • Welcome
  • Getting Started
    • Account Setup
  • AWS CLI
    • AWS CLI Overview
    • Installation
  • AWS Fundamentals
    • AWS Documentation
    • AWS Shared Responsibility Model
    • Organizational Hierarchy
    • AWS Principals
    • IAM Fundamentals
      • IAM Policy Components
      • IAM Documentation References
    • AWS Security Services Overview
    • AWS Core Services
    • AWS Frameworks
    • Regions and Availability Zones
  • SQL
    • SQL Refresher for Threat Hunting
  • Logging Reference
    • Cloudtrail
      • What is Cloudtrail?
      • Setting Up Cloudtrail
      • Cloudtrail Events Structure
      • Filtering and Searching CloudTrail Logs
      • IAM ID Prefixes
      • Additional Resources
      • API References
    • VPCFlow Logs
    • GuardDuty
      • Multi-Account Setup
      • GuardDuty Concepts
      • GuardDuty Finding References
      • S3 Protection
      • Malware Protection
        • EC2 Malware Protection
          • EC2 Protection Resources
          • Monitoring Scans
          • EC2 Malware Protection Events: CloudWatch
        • S3 Malware Protection
          • Enabling S3 Malware Protection
          • After Enabling S3 Malware Protection
          • S3 Malware Resource Plan Status
          • S3 Malware Protection Quotas
      • RDS Protection Enablement
      • Lambda Protection Enablement
      • Trusted IP Lists and Threat Lists in Amazon GuardDuty
      • Remediation Recommendations
      • GuardDuty API Reference
      • GuardDuty Quotas
    • Access Analyzer
      • Setup
      • External Access and Unused Access Analyzer Findings
      • Review Findings
      • Access Analyzer Resources
      • Access Analyzer API Reference
    • AWS Network Firewall
      • Permissions
      • Firewall Log Contents
      • Logging Destinations
      • CloudWatch Firewall Metrics
    • AWS Config
      • Resource Management in AWS Config
      • AWS Config Integrations
      • AWS Config Resources
      • Configuration Item
      • Config Rules
        • Evaluation Modes
  • CloudWatch
    • Amazon CloudWatch
      • CloudWatch Concepts
      • CloudWatch Metrics
        • Filter Pattern Syntax
      • CloudWatch Alarms
        • Alarm Recommendations
      • Subscriptions
      • CloudWatch Agent
      • CloudWatch Insights
        • Supported Logs and Discovered Fields
        • CloudWatch Insights Query Syntax
      • Anomaly Detection
        • Create Anomaly Detector
        • Alarms for Anomaly Detections
      • CloudWatch Filter Syntax
      • CloudWatch Service Quota
  • Athena For Threat Hunting
    • Introduction to Athena
    • Setting Up Athena
    • SQL For Threat Hunters
    • Automated Response
    • Query Best Practices
  • AWS Security Research and Resources
    • AWS Security Blog
    • AWS Goat
    • Cloud Goat
    • Pacu
    • Prowler
    • Scout Suite
  • Threat Hunting in AWS
    • Threat Hunting in AWS
    • Threat Hunting Introduction
    • Threat Hunting Process
      • Hypothesis Generation
      • Investigation
      • Identification
      • Resolution & Follow Up
    • Pyramid of Pain
    • MITRE Att&ck
      • MITRE Att&ck Concepts
      • MITRE Att&CK Data Sources
      • MITRE Att&CK Mitigations
    • MITRE Att&ck: AWS
      • MITRE Att&CK Matrix
      • Amazon Web Services Security Control Mappings
    • AWS Threat Hunting Ideas
      • AWS Threat Hunting Ideas: EC2
      • AWS Threat Hunting Ideas: Lambda
      • AWS Threat Hunting Ideas: SQS
      • AWS Threat Hunting Ideas: SNS
      • AWS Threat Hunting Ideas: RDS
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On this page
  • CloudWatch Concepts
  • Namespaces
  • Metrics
  • Time Stamps
  • Retention
  • Dimensions
  • Resolution
  • Statistics and Aggregation
  • Alarms
  1. CloudWatch
  2. Amazon CloudWatch

CloudWatch Concepts

CloudWatch Concepts

Namespaces

  • A namespace is a container for metrics, isolating metrics from different applications.

  • AWS services follow a convention: AWS/service (e.g., AWS/EC2).

Metrics

  • Metrics represent a time-ordered set of data points (e.g., EC2 instance CPU usage).

  • Metrics are unique per Region and expire after 15 months without new data.

  • Custom metrics can have high-resolution (1 second) or standard-resolution (1 minute).

  • Metrics have dimensions (name/value pairs) that identify specific metrics (e.g., InstanceId for EC2).

Time Stamps

  • Each metric data point must include a time stamp in UTC.

  • CloudWatch can accept time stamps up to 2 weeks in the past or 2 hours into the future.

Retention

  • Retention depends on data resolution:

    • < 1 minute: Available for 3 hours

    • 1 minute: Available for 15 days

    • 5 minutes: Available for 63 days

    • 1 hour: Available for 15 months

Dimensions

  • Dimensions help categorize metrics (e.g., Server=Prod, Domain=Frankfurt).

  • CloudWatch aggregates metrics only for matching dimension sets.

Resolution

  • Metrics can be:

    • Standard resolution: 1-minute granularity.

    • High resolution: 1-second granularity.

Statistics and Aggregation

  • Statistics summarize metrics over specific time periods (e.g., Min, Max, Average).

  • Percentiles (e.g., p95) help detect anomalies in data distribution.

Alarms

  • Alarms monitor metrics and perform actions (e.g., Auto Scaling or SNS notifications).

  • Alarms act only on sustained state changes.

  • High-resolution alarms have periods of 10 or 30 seconds but come with additional costs.

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Last updated 8 months ago