If the server does not add NoWritesPerformed error label as described in SERVER-113311, we may need to have the driver automatically add the NoWritesPerformed label to all errors that have the SystemOverloadedError label. Otherwise the driver can raise a misleading error message to the user which make it appear that a command was never attempted. The logic would look like:

if error.has_error_label("SystemOverloadedError"):
    error.add_error_label("NoWritesPerformed")

The one concern to discuss is if there are cases where the server would intentionally omit the NoWritesPerformed.