The Service Is Not Down, but Slow Requests Are Already Consuming User Patience
Ten minutes after a release finished, the payment confirmation page showed no error.
Release owner Xiao Zhou watched the dashboard: instances were alive, the API returned successfully, and the error rate had not risen. But the business contact forwarded a customer-service message into the group: "The page keeps spinning. The user clicked twice and still got no result."
Xiao Zhou first checked availability. It was still green. He then checked average latency, which did not look outrageous either. Should he roll back? The evidence at that moment was not enough to support that decision.
But users were already waiting. The hardest part of this scene is that "the service is available" on the surface and "the operation feels smooth" to users are not the same thing.
