Why the build could not start: an entity-resolution build was still running, another graph build held the KB,
a manual rebuild was queued ahead of it, a bulk ingestion was writing to it, or graphRag.autoBuildPaused was set.
The last reason seen in the window.
When the skip was recorded (epoch millis).
The cron slot that was skipped (epoch millis).
When the slot's catch-up window closed (epoch millis).
A scheduled structural build slot whose catch-up window closed (or the next slot superseded it) without a structural build, because the automatic build could not start while the window was open.