While deploying T233864, noted that the train-deploy-notes job currently fails:
Per @mmodell, this is a known issue with branching by way of branch.py. Additionally we seem to have deprecated a config file that the script relies on.
I created MediaWiki_1.35/wmf.16/Changelog manually using:
12:33:00 brennen@metaphor:~/release/make-deploy-notes (master m0/u1) ❂ python3 makedeploynotes.py 1.35.0-wmf.15 1.35.0-wmf.16
...after moving release/make-wmf-branch/config.json-deprecated to release/make-wmf-branch/config.json and deleting comments atop the file.