Like most disruptive technologies, Qlik often starts with a visionary taking lead and implementing a few dashboards to an Enterprise BI. Or even when it is implemented as an Enterprise BI, the data and usage grow much faster than planned. Multiple teams do development and implementations where the best practices may not be followed and data and dashboards could be duplicated. This can throw surprises at times like quarter end or year end when the loads are high and ad hoc dashboards are getting developed.  

Health check ensures smooth functioning of the system with proper planning to implement best practices and revisit system sizing.