The Silent Failure
Two systems run the same code.
One fails in silence. The other fails and tells you why.
A user reports: "Checkout is broken. I can't place an order."
Click each system to investigate the failure.
api-gateway
checkout-svc
payment-svc
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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