I believe these are Postgres database files, presumably related to the Postgres database used to track usage, etc. on Tableau Server. I'm not a server admin, so I am not 100% sure, but that's what this appears to be.
Thanks for the response. So do you know if these files can be safely deleted? My guess is that only one file (the latest file) is needed, if even that. I am not sure if these are just historical snapshots or if they are being actively used by Tableau. So any help you (or anyone else on this forum) can provide to help me figure this out would be greatly appreciated
Tableau Server Admin
I'm not a Postgres expert, but I believe that Postgres data files have a limit of 1 GB. When more space is needed, the database engine creates additional 1 GB files, with extensions .1, .2, .3, etc. (see postgresql - What are the files with the extensions .1, .2 or .3 in the data directory - Database Administrators Stack E… for more). So, don't delete them--you'd be deleting your Tableau Server PostgreSQL database, which wouldn't be good.
Instead of trying to delete these files, could you potentially increase the drive's space?
Another thing to consider is how much history is retained in your Postgres database. See the following for more details: Create Custom Administrative Views - Tableau. Unfortunately, however, I'm not sure that's a short-term fix.