Lambda Monitoring & X-Ray Tracing

Logging and Monitoring

• We can use CloudWatch Logs.
  • Make sure you have IAM policy attached to your lambda to write into Cloudwatch logs
• We also have CloudWatch Metrics for AWS Lambda
  • Invocations, durations, concurrent execution
  • Error counts, failure, throttle, etc..

Tracing with X-Ray

• Enable in Lambda configuration (Active Tracing)
• Don't need to runs X-Ray daemon since Lambda does it for you
• Remember to use the X-Ray SDK and ensure that you have the correct Lambda Execution Role (IAM Role) to write to Xray
  • managed policy: AWSXrayDaemonWriteAccess
• Environment variables to communicate with X-Ray
  • _X_AMZN_TRACE_ID : contains tracing headers
  • AWS_XRAY_CONTEXT_MISSING: default set to LOG_ERROR to prevent throwing exception
  • AWS_XRAY_DAEMON_ADDRESS: the X-Ray daemon IP_ADDRESS:PORT