A method by a network node for prioritizing the collection of data, the method comprising: receiving from an Operations, Administration, and Management, OAM, system, a configuration for collecting performance management, PM, data, the configuration comprising a plurality of PM counters, each PM counter being associated with a parameter to be measured by the network node; based on the configuration comprising the plurality of PM counters, collecting data for the plurality of PM counters; and reporting the data collected to the OAM system; the method being characterised in that: in said configuration, priority information is associated with at least one of the plurality of PM counters, the priority information identifying the at least one PM counter as being of a higher priority than at least one other PM counter, wherein the at least one PM counter that is of the higher priority is used for charging for Radio Access Network, RAN, sharing; and in that said collecting data is further based on the priority information, wherein prioritizing the collection of data for the plurality of PM counters comprises at least one of: based on the priority information, allocating a portion of dedicated memory to a prioritized PM counter; and based on the priority information, reserving at least one processing resource for the collection of data for the prioritized PM counter. receiving from an Operations, Administration, and Management, OAM, system, a configuration for collecting performance management, PM, data, the configuration comprising a plurality of PM counters, each PM counter being associated with a parameter to be measured by the network node; based on the configuration comprising the plurality of PM counters, collecting data for the plurality of PM counters; and reporting the data collected to the OAM system; the method being characterised in that: in said configuration, priority information is associated with at least one of the plurality of PM counters, the priority information identifying the at least one PM counter as being of a higher priority than at least one other PM counter, wherein the at least one PM counter that is of the higher priority is used for charging for Radio Access Network, RAN, sharing; and in that said collecting data is further based on the priority information, wherein prioritizing the collection of data for the plurality of PM counters comprises at least one of: based on the priority information, allocating a portion of dedicated memory to a prioritized PM counter; and based on the priority information, reserving at least one processing resource for the collection of data for the prioritized PM counter. in said configuration, priority information is associated with at least one of the plurality of PM counters, the priority information identifying the at least one PM counter as being of a higher priority than at least one other PM counter, wherein the at least one PM counter that is of the higher priority is used for charging for Radio Access Network, RAN, sharing; and in that said collecting data is further based on the priority information, wherein prioritizing the collection of data for the plurality of PM counters comprises at least one of: based on the priority information, allocating a portion of dedicated memory to a prioritized PM counter; and based on the priority information, reserving at least one processing resource for the collection of data for the prioritized PM counter. based on the priority information, allocating a portion of dedicated memory to a prioritized PM counter; and based on the priority information, reserving at least one processing resource for the collection of data for the prioritized PM counter.