Customers cannot use the app, every health check is green, and the load balancer is happily sending traffic. Find the gap.

A health endpoint that returns 200 because the process is running tells you the process is running. Interviewers want to hear where you draw the line between a check that pages and a check that removes traffic.

Updated Sep 2026 · Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.