Running out of the threads on uiuc.chat backend

[lmarini]

Looking at thread pools. Deployed a fix on railways. Added thread monitoring that sends info to posthog.

[lmarini]

@rohan-uiuc added monitoring and reduced number of threads per worker. One process has 11 thread the other 300 in the same worker. One process is obviously leaking threads. lowering upper bounds helps with leaks, but still happening.