(This may turn into an RFC for a more refined & well defined runtime interface.)

Recently there have been a few examples of features which have been difficult to implement because of the structure of the worker package of ATC.

• Feature Request: slightly better scheduling (don't kill my workers under load) #2577
• Check containers will only be placed on global workers #2910
• ...

We should look at the architecture of the code, and the interfaces available to create containers/volumes, find containers/volumes, select a worker for containers/volumes, etc.