Since (felt) very recently the "Replay" button is not shown anymore for slightly older (pipeline) builds. What does it depend on? It does not seem to be available based on (a) work day,
or (jenkins log inspired suspicions) (b) jobAnalytics or (c) Workspace clean-up.
Maybe it always behaved like this and I have really never ever tried to replay a slightly older build. Which I doubt (at the moment).
P.S.: Experienced when using Jenkins core 2.115 and most other plugins being up-to-date (e.g. workflow-job updated from 2.17 => 2.18, and workflow-cps updated
from 2.45 => 2.47)
P.P.S.: sorry for kind of cross-posting due to being impatient after getting no response from http://webchat.freenode.net/?channels=jenkins