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The Silent Failure

Two systems run the same code.
One fails in silence. The other fails and tells you why.

incident report

Checkout is broken. Users can’t place orders.

Click each system to investigate the failure.

System A click to investigate

api-gateway

checkout-svc

payment-svc

—

System B click to investigate

api-gateway

checkout-svc

payment-svc

—

Which system can you actually debug?

System B emits data about itself. System A does not.
What is the data that System B emits called?

Telemetry

Data a system emits about itself.

Without it, a system is a black box. With it, you can see inside.

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