This Service Setcan be separated into two groups: Services that are called by OPC UA Clientsand Servicesthat are invoked by OPC UA Servers. The FindServersand GetEndpoints Servicesthat are called by OPC UA Clientsmay generate audit entries for failed Serviceinvocations. The RegisterServerService that is invoked by OPC UA Serversshall generate audit entries for all new registrations and for failed Serviceinvocations. These audit entries shall include the ServerURI, Servernames, DiscoveryURIs and isOnline status. Audit entries should not be generated for RegisterServerinvocation that does not cause changes to the registered Servers.