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Deploy log
A deploy log is the running commentary of one attempt to put your app online, and the first thing to read when a deploy fails.
Also called: build log, the deploy output
When you deploy, your host narrates as it goes: taking your code, assembling it, starting the app. There is one for every attempt.
It is not the app's own log. This one covers the few minutes around going live; that one covers everything the app does for the rest of its life.
Find yours before you need it. When a deploy fails, the reason is in there, usually well above the last line, so hand your agent the whole thing, not the part you thought looked important.