Day 4 - X-Ray and CloudWatch for Serverless Observability

X-Ray: Distributed Tracing

X-Ray traces requests across distributed services, showing latency, errors, and dependencies. For Lambda calling DynamoDB, S3, and other services, X-Ray visualizes complete request flow.

Enable X-Ray on Lambda:

aws lambda update-function-configuration \
  --function-name myapp \
  --tracing-config Mode=Active

Add X-Ray SDK to function:

from aws_xray_sdk.core import xray_recorder
from aws_xray_sdk.core import patch_all
 
patch_all()  # Auto-instrument AWS SDK calls