The present disclosure relates to End-to-End (E2E) Quality of Service (QoS) monitoring for strict E2E performance requirements in 5G networks including Network Slices (NSs) or Network Sub Slices (NSSs). The present disclosure provides a a control plane entity for obtaining NS Instance (NSI) data for analytics from a management plane entity, and a management plane entity to provide NSI data to a control plane entity. The control plane entity is configured to request NSI topology information from the management plane entity, obtain at least one first set of Key Performance Indicators (KPIs) or at least one set of measurements, and generate the data for analytics based on the requested NSI topology information and at least one of the obtained first set of KPIs or the obtained one at least one set of measurements.