Network cluster and tenant-aware hierarchical processing system for distributed quality of service

A quality of service (QoS) processing system for one or more services, the QoS processing system comprising:

• a plurality of QoS processing nodes arranged in a hierarchical tree structure that includes at least two hierarchy levels,
• wherein a highest hierarchy level of the at least two hierarchy levels comprises one or more root nodes of the hierarchical tree structure of the plurality of QoS processing nodes, each root node being associated with a set of service instances of the one or more services,
• wherein a lowest hierarchy level of the at least two hierarchy levels comprises a plurality of leaf nodes of the hierarchical tree structure of the plurality of QoS processing nodes, each leaf node being associated with one service instance of the one or more services, each leaf node being a descendant of at least one root node, and service instances of the set of service instances of each root node being associated to the leaf nodes descending from that root node,
• wherein each leaf node is configured to apply a local QoS policy to the associated service instance, and
• wherein each root node is configured to apply a first common QoS policy to the set of service instances associated with the respective root node.