Here are prometheus graphs for 5 minutes of usage in Dagit. Simply clicking around, looking at runs, assets partitions, etc. The Dagster deamon is not running, so this is only reading data of out postgres. The first graph is a 15s sampling of the number of open connections which shows a peak at 6, but is usually around ~3 which seems reasonable. The second graph shows the number of connections made, you can see that this keeps increasing and after only 5 minutes, we’ve already opened (and closed) 90 connections to postgres. This seems excessive to me, is this expected? Normally, database connections are pooled and reused since they are typically a bit expensive to obtain (TCP / TLS, authentication, postgres “startup sequence”, etc.). Are connections not reused in dagster?

Here are the same graphs, over 15 minutes of running ~60 runs and some clicking around in Dagit. You can see the total number of connections made is >7K while we never have more than 10 concurrent connections opened at any time. That’s a rate of about 7 connections per second. Is this a known problem?