Under the hood
Useful2 Signal3
Remote runners read marker files to report whether prewarm and prefetch finished, yielded or timed out.
What's wrong with this entry?
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What
On remote runners, small marker files in /tmp written by the runner are parsed into outcomes: done, yielded, aborted or timeout, with elapsed seconds, plus a prefetch state file giving phase, run counts, age of the last success and an index. Reads do not follow symlinks, do not block, and stop at 4KB; a missing file reports absent. A timer for runner prep steps was added too.
Evidence
ccr-byoc-prewarm-vda.done
Strings lifted out of the shipped bundle, so the claim above can be checked against them.