Lambda Monitoring & X-Ray Tracing¶

Lambda Logging & Monitoring¶

• CloudWatch Logs
  • AWS Lambda execution logs are stored in AWS CloudWatch Logs
  • Make sure your AWS Lambda functions has an execution role with an IAM policy that authorizes writes to CloudWatch Logs
• CloudWatch Metrics
  • AWS Lambda metrics are displayed in AWS CloudWatch Metrics
  • Invocations, Durations, Concurrent Executions
  • Error count, Success Rates, Throttles
  • Async Delivery Failures
  • Iterator Age (Kinesis & DynamoDB Streams)

Lambda Tracing with X-Ray¶

• Enable in Lambda configuration (Active Tracing)
• Runs the X-Ray daemon for you
• Use AWS X-Ray SDK in Code
• Ensure Lambda Function has a correct IAM Execution Role
  • The managed policy is called AWSXRayDaemonWriteAccess
• Environment variables to communicate with X-Ray
  • _X_AMZN_TRACE_ID: contains the tracing header
  • AWS_XRAY_CONTEXT_MISSING: by default, LOG_ERROR
  • AWS_XRAY_DAEMON_ADDRESS: the X-Ray Daemon IP_ADDRESS:PORT