Design the system that decides on its own whether a canary is healthy enough to promote.

Comparing the canary against last week is how a Tuesday afternoon looks like a regression. Compare it against a baseline running the same traffic at the same moment, and decide with a threshold somebody can defend.

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.