'Return group id of this discovery.
All running recoveries with the same group_id should return the same
set of resources at a given point in time. By default, a discovery is
put into a global group, meaning that all discoveries of its type
running anywhere in the cloud, return the same set of resources.
This property can be overridden to provide correct grouping of
localized discoveries. For example, compute discovery is localized
to a host, which is reflected in its group_id.
A None value signifies that this discovery does not want to be part
of workload partitioning at all.'

@property
def group_id(self):

    return 'global'
