This query lists the statistics for the objects that used the runHuntingQuery API call using the Graph API. This can help determine which applications access your security data and identify new applications that connect to this Graph API endpoint.
MicrosoftGraphActivityLogs
| where RequestUri has "runHuntingQuery"
| extend ObjectId = coalesce(UserId, AppId)
| extend ObjectType = iff(isempty(AppId), "User", "Application")
| summarize TotalCalls = count() by ObjectId, ObjectType
MicrosoftGraphActivityLogs
| where RequestUri has "runHuntingQuery"
| extend ObjectId = coalesce(UserId, AppId)
| extend ObjectType = iff(isempty(AppId), "User", "Application")
| summarize TotalCalls = count() by ObjectId, ObjectType