Serverless Observability: X-Ray, Powertools आणि Structured Logs

By Ravindra Bagale, trainer · LinkedIn · Last updated: 2 November 2026

1. रोजचे उदाहरण: कुरिअर tracking

Fatima (MAD) tracking. Diego (BRL) checkout: APIGW → Lambda → DDB. Correlation id नसेल तर Black Friday अंधुक.

Depth: CloudWatch; compute: Lambda. इथे serverless observe pattern.

2. का?

हे का लागतं?

SSH नाही. Short-lived. Retries मध्ये failure लपते. Day one observe — 2 AM नंतर नव्हे.

हे काय आहे?

Serverless observability = logs + metrics + traces + alarms + correlation ids.

3. Vertical diagram

4. How: MVO

कसं करायचं (step by step)

1. JSON fields.
2. X-Ray on.
3. Business metrics.
4. Core alarms.
5. Runbook in alarm.
6. Redact PII.

5. Commands + meaning

Tail logs

aws logs tail /aws/lambda/checkout-api --region ap-south-1 --since 10m --format short

अर्थ: Incident साठी जलद view.

X-Ray summary

aws xray get-service-graph --region ap-south-1 \
  --start-time $(date -u -d '30 minutes ago' +%s) \
  --end-time $(date -u +%s) \
  --query 'Services[].{N:Name,E:RootSummaryStatistics.ErrorCount}' 

अर्थ: कुठला hop error.

Alarm sketch

aws cloudwatch describe-alarms --region ap-south-1 \
  --alarm-name-prefix checkout --max-records 10 \
  --query 'MetricAlarms[].{N:AlarmName,S:StateValue}' 

अर्थ: Staging मध्ये alarm state.

Filter orderId

aws logs filter-log-events --region ap-south-1 \
  --log-group-name /aws/lambda/checkout-api \
  --filter-pattern '{ $.orderId = "ord-7841" }' --limit 20 

अर्थ: JSON orderId असेल तरच.

6. Powertools

• Logger bind.
• Tracer outbound.
• Cold start metric.
• Idempotency util.

7. Alarms

8. Industries

• Fintech corr.
• Ecommerce.
• PHI redact.
• Logistics hubs.
• SaaS tenant.

9. Lab

10. Lab - logs/alarm

Org block नसेल तर ap-south-1 (Mumbai). आधी budget alert.

कसं करायचं (step by step)

1. JSON log.
2. X-Ray map.
3. Alarm+SNS.
4. Runbook 5 lines.

Cleanup (billing थांबवा)

1. Cleanup alarm.
2. X-Ray off.

11. एकाच pattern — वेगवेगळ्या industries

• Fintech (Aisha, Lagos): payment webhooks → SQS → Lambda.
• Ecommerce (Rohan, Pune): checkout API; inventory SNS fan-out.
• Healthcare (Mei, Singapore): SNS SMS; PHI + fine-grained IAM.
• EdTech (Diego, São Paulo): EventBridge nightly cleanup.
• Logistics (Fatima, Casablanca): EventBridge + saga.
• Media (Kenji, Osaka): S3 → Lambda thumbs + fan-out.
• SaaS (Priya, Bengaluru): Cognito + per-tenant partition.
• Gov (Omar, Amman): strangler fig per form route.

12. Troubleshooting checklist

1. Region confirm करा.
2. CloudWatch Logs + request id.
3. Execution role permissions.
4. DLQ + oldest message age.
5. curl -v + CORS.
6. SFN event history.
7. Linked chapter पुन्हा वाचा.
8. Cost: concurrency/retries.

13. सामान्य errors आणि fixes

प्रत्येक row = खरी चूक. Panic करण्याआधी fix वाचा.

14. FAQ

15. Interview Q&A (Beginner / Mid / Senior + MNC)

16. Tips — English, मराठी आणि हिंदी

17. Architecture decision checklist

1. User journey 5 bullets, no AWS names.
2. Sync vs async mark.
3. Failure mode.
4. Idempotency key.
5. Data from access patterns.
6. Cost 1x and 10x.
7. Quotas ap-south-1.
8. Auth decision.
9. On-call + alarm.
10. Deep chapter link.
11. मग console/IaC.

18. Copy-paste quick commands

# Region and identity
aws configure get region
aws sts get-caller-identity

# Lambda landscape
aws lambda list-functions --region ap-south-1 --max-items 20 \
  --query 'Functions[].{N:FunctionName,R:Runtime,T:Timeout,M:MemorySize}' --output table
aws lambda get-account-settings --region ap-south-1

# API Gateway (HTTP APIs)
aws apigatewayv2 get-apis --region ap-south-1 --query 'Items[].{N:Name,Id:ApiId,Ep:ProtocolType}' --output table

# Queues and topics
aws sqs list-queues --region ap-south-1
aws sns list-topics --region ap-south-1 --query 'Topics[].TopicArn'

# Event buses and state machines
aws events list-event-buses --region ap-south-1
aws stepfunctions list-state-machines --region ap-south-1 --query 'stateMachines[].name'

# DynamoDB tables (names only)
aws dynamodb list-tables --region ap-south-1

Sandbox + read-only IAM.

19. अजून industry आणि stack stories

• Fintech Lagos: webhook → SQS → idempotent ledger.
• Ecommerce Pune: throttle + fan-out.
• Healthcare SG: SNS + PHI IAM.
• EdTech: EventBridge cleanup.
• Logistics: bus + saga.
• Media: avoid recursive S3.
• SaaS: tenant partition.
• Gov: strangler peel.
• Startup: Function URL → HTTP API.
• Retail: FIFO vs Standard.

• Python: thin handlers.
• Node: async/await.
• Java: SnapStart.
• .NET: package size.
• Go: static binary.
• PHP: hybrid.

20. Glossary

21. Practice: मोठ्याने explain

1. 60s: serverless observability गोष्ट.
2. 60s: sync vs async checkout.
3. 60s: Lambda नको कधी.
4. 60s: DLQ + idempotency.
5. Record ×2.

22. Safe lab hygiene

• Tag owner+expiry.
• Budget alarm आधी.
• Read-only first.
• Cleanup.
• No secrets in env/screenshots.
• No provisioned on hello.

23. या chapter च्या links

• Compute: Lambda.
• HTTP: API Gateway.
• Data: DynamoDB.
• Messaging: SQS/SNS.
• Events: EventBridge.
• Workflows: Step Functions.
• build-* projects link.

24. Myths

25. Serverless error budget

Checkout error budget 0.1% असेल तर aggressive retries email duplicates देऊन budget जाळू शकतात. Money SLO ≠ notify SLO.

1. दोन SLOs.
2. Money retries bounded.
3. Notify best-effort.
4. Money page; notify ticket.

26. Regional notes (ap-south-1)

• Labs Mumbai.
• Feature availability.
• Data residency.
• Latency India.

27. Naming conventions

# Suggested prefixes
# Lambda:  pay-intake-prod, pay-worker-prod
# SQS:     pay-orders.fifo / pay-orders-dlq
# SNS:     pay-order-events
# EB bus:  pay.domain
# SFN:     pay-refund-saga
# DDB:     pay-orders-prod

env + domain नावात ठेवा. CloudWatch grep सोपा.

28. Pre-mortems

1. Double charge headline.
2. DLQ drain plan.
3. Cognito outage mode.
4. Runbook.

29. Currency / locale

Currencies आणि names rotate करा — global mental model.

30. Aisha ledger

1. Page.
2. DDB throttle.
3. DLQ.
4. Fix+runbook.

31. Anti-patterns

• No request id.
• No runbook.
• Over-trace.

उजळणी, मुलाखत आणि तुलना cards

हा lesson काही मिनिटांत revise करा. Cards phone वर save करा किंवा PNG download करा. प्रत्येक card वरचा QR हा lesson उघडतो.

अजून cards: Ravi Sir's Cards.