+=item B<Cores> I<cores groups>
+
+All events are reported on a per core basis. Monitoring of the events can be
+configured for a group of cores (aggregated statistics). This field defines
+groups of cores on which to monitor supported events. The field is represented
+as list of strings with core group values. Each string represents a list of
+cores in a group. If a group is enclosed in square brackets each core is added
+individually to a separate group (that is statistics are not aggregated).
+Allowed formats are:
+ 0,1,2,3
+ 0-10,20-18
+ 1,3,5-8,10,0x10-12
+ [4-15,32-63]
+
+If an empty string is provided as value for this field default cores
+configuration is applied - that is separate group is created for each core.
+