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System Design Masterclass · Observability Monitoring
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A user files a support ticket: "My order failed at checkout." Your system processes 50,000 requests per minute across 30 microservices. The user's checkout attempt touched the , the auth service, the cart service, the inventory service, the payment service, and the notification service. Each service wrote its own logs.
Without request IDs, you're searching for a needle in a haystack of millions of log lines. You might grep for the user's email across every service, hoping the relevant logs mention it. Maybe you find something in the payment service. But what happened before the payment call? Which cart items were involved? Did the inventory check pass?
A request ID is a unique identifier (typically a UUID) generated at the very start of a request and propagated through every service it touches. Every log line includes it. So when you search for request_id: req_abc123, you get the complete story of that request across all 30 services, in chronological order. One search. Full picture.
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