A library Wi-Fi enable request produces this short event log: back-end accepted req-8821; controller-A returned 200; controller-B returned 429; UI showed a generic failure. Where should diagnosis focus first?
Select an answer to reveal the explanation.
Short Explanation
Like reading a delivery trail—warehouse OK, truck A OK, truck B rejected for too many stops—you fix the rejected hop. The 429 on controller-B is the smoking gun. A generic UI error is just the last shout.
Full Explanation
Multi-hop civic integrations require reading the event: acceptance and a 200 elsewhere do not cancel a 429 on another dependency. Diagnosis isolates the failing hop from the log excerpt instead of blaming the entire application or unrelated UI chrome. Rate limiting on controller-B is the actionable finding.