Collect and cache metadata, run hooks on changes.

Gerrit User 22348 2a6d0c01d8 Update patch set 1 ... Patch Set 1: -Verified Starting gate jobs. Patch-set: 1 Tag: autogenerated:zuul:gate Label: Verified=0, 292e1435b24a9310301d2bd5a3ffc094a50a8a01		2024-01-25 02:57:05 +00:00