Example of chatty logging:
These logs don't convey knowledge to our users and are not actionable. On the config server, they can spam to a user with many sharded collection in our auto-balancing code every 10 seconds because we force refresh for every chunk the balancer attempts to move.
The logs come from the CatalogCache and the CatalogCacheLoader.
The logs were useful while we were trying to stabilize the new/modified refresh logic, but less so now, and our testing can retain the same information with log-level 1 set.