5. When command waits to free worker, write to log 6. When command was not be executed due missing workers (and max_workers > 0), write to log
Also unfortunate. We already don't provide enough monitoring capability and this just makes that worse.
theoretically it can be supported some pg_stat_ view - but I would not to implement a some history table for commands. Again it is task for higher layers.
I don't think we want to log statements, but we should be able to log when a job has run and whether it succeeded or not. (log in a table, not just a logfile).
This isn't something that can be done at higher layers either; only the scheduler will know if the job failed to even start, or whether it tried to run the job.
I don't agree - generic scheduler can run your procedure, and there you can log start, you can run other commands and you can log result (now there is no problem to catch any production nonfatal exception). Personally I afraid about responsibility to maintain this log table - when and by who it should be cleaned, who can see results, ... This is job for top end scheduler.
Regards
Pavel
-- Jim Nasby, Data Architect, Blue Treble Consulting Data in Trouble? Get it in Treble! http://BlueTreble.com