Add configuration options for monitoring

**Feature request**
It would be great to have logging for controllers.

**Use case**
Many users need this functionality for production deployments.

**Implementation idea**
Add a new config option `enable_logging` with default `false`.

No file or test is named. Start by locating the controller entry points, existing configuration handling, and current logging setup; then determine how the enable_logging default is represented and how controller activity is expected to appear in production logs. Done means the option defaults to false and enabling it produces the agreed controller logs without changing the default behavior.

Written by the indexing model from the issue text.