It looks like this patch got feedback from Andres and Robert with some significant design change recommendations. I'm marking the patch Returned with Feedback. Feel free to add it back to a future commitfest when a new version is ready.
- Re: Add index scan progress to pg_stat_progress_vacuum Imseih (AWS), Sami
- Re: Add index scan progress to pg_stat_progress_va... Robert Haas
- Re: Add index scan progress to pg_stat_progres... Masahiko Sawada
- Re: Add index scan progress to pg_stat_pro... Greg Stark
- Re: Add index scan progress to pg_stat_progress_va... Masahiko Sawada
- Re: Add index scan progress to pg_stat_progres... Imseih (AWS), Sami
- Re: Add index scan progress to pg_stat_pro... Masahiko Sawada
- Re: Add index scan progress to pg_stat... Imseih (AWS), Sami