This is an index into ClusterXL's table of reported critical device problems, a Check Point concept for named internal checks (like sync status or process health) that can force a member out of the active role. This index lets the following haProblemName/Status/Priority/Descr fields be correlated to a specific reported issue when multiple problems exist simultaneously on the same member. An admin seeing multiple rows in this table for one member knows several independent critical devices are currently flagged, not just one.