Re: Add mode column to pg_stat_progress_vacuum

I am bit late to this thread, but I have a comment.

> This patch introduces a mode column to provide this visibility. The
> possible values are:
> - normal: A standard, user-initiated VACUUM or a regular autovacuum run.
> - anti-wraparound: An autovacuum run launched specifically to prevent
> transaction ID wraparound.
> - failsafe: A vacuum that has entered failsafe mode to prevent
> imminent transaction ID wraparound.

The vacuum command detail can now be determined from
pg_stat_activity.query by joining with pg_stat_progress_vacuum, right?
I don't see why this is not sufficient, especially because it already
indicates how the vacuum was triggered, and the autovacuum activity
message also tells you why it was triggered. We could perhaps add "due to
failsafe" to the autovacuum activity message to explicitly show that reason.

--
Sami Imseih
Amazon Web Services (AWS)