In the case where there are multiple resource types with overlapping names (such as having requisitionMetrics and requisitionMetrics2), the Performance DS displays the resource ID as

resourceId:"nodeSource[selfmonitor:1].requisitionMetrics[INSTANCE_NAME]2"
where the 2 is after the instance name and not part of the resource type.

This seems to only apply when the resource is a nodeResources(node, *, resourceType) variable and not when picking a specific resource from the drop down.