How would you reason about cold starts, warm pools, and steady-state traffic?

Example Answer

I think of them as different operating regimes, not one blended system behavior. Cold starts dominate low-frequency or bursty traffic. Warm pools matter when you want predictable latency without paying for full overprovisioning. Steady-state traffic is where normal throughput optimization usually works best.

The right choice depends on traffic shape and product promise. A consumer chat app with spiky demand needs a different serving posture than an internal workflow tool with steady weekday volume.

I do not want one policy optimized for the average if users mainly feel the worst case. That is where cold starts and pool sizing become product issues, not just infrastructure details.

What I always try to avoid is giving a process answer that sounds clean in theory but falls apart once the data, users, or production constraints get messy.

Common Poor Answer

A weak answer is treating cold starts as a minor infrastructure nuisance. In many products, they are a direct user-experience problem.