Collect and cache metadata, run hooks on changes.

Gerrit User 9816 cd77c78335 Create patch set 3 ... Uploaded patch set 3. Outdated Votes: * Verified-1 Patch-set: 3 Subject: Update python job template Commit: 76173d84d6 Tag: autogenerated:gerrit:newPatchSet Groups: 76173d84d6		2023-10-18 06:00:46 +00:00