Hi,

Use below link to see how many cases have KB articles attached. Mark my answer as correct if that helps.

https://yourinstance/m2m_kb_task_list.do?sysparm_query=task.numberSTARTSWITHHRC&sysparm_first_row=1&sysparm_view=&sysparm_choice_query_raw=&sysparm_list_header_search=true

Regards