Revise · W06 · Day 5Operations, Scale and Edge Cases
5:00
Key ideaDay 5 · 1/9
Measure the user's clock
End-to-end latency from created_at, not dequeue time, and the oldest message's age per lane. Success rates only count attempts, so a four-minute queue looks perfect.
← → flip · space next / show answer · S shuffle · esc exit1 / 9