Memory issues can be caused by a number of things. There's been a lot of work done to improve some leakages around the logging -- both by being able to disable logging if you don't need it or switch to a different logger, and general improvements to the default jsonlog logger.

There's also been a known issue around creating lots of `docker exec` instances and those references not being released (so you can query for status later), this is also resolved.

It would be awesome if you could profile it and submit a bug report with how you are using docker and where you are seeing memory growth. Let me know how I can help so we can get this resolved.