You might find this useful...
https://supportforums.cisco.com/document/9869811/cisco-wlc-snmp-historical-user-statistics-monitoring-w-syslog-or-splunk,You might find this useful...
https://supportforums.cisco.com/document/9869811/cisco-wlc-snmp-historical-user-statistics-monitoring-w-syslog-or-splunk
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