What do you ask for first when CI fails but local tests pass?

A Software Q&A prompt about the first facts to collect before changing code for a CI-only failure.

When someone says “CI fails but it passes locally,” what do you ask for before suggesting a fix? I usually want the exact CI command, runtime versions, package manager mode, cache state, and first real error line. Missing any one of those can send the thread toward guesses instead of a reproducible answer.