App Gateway WAF - XSS Detection

Original query, unchanged.

let Threshold = 3;  
AGWFirewallLogs
| where Action == "Matched"
| where Message has "XSS"
| project TransactionId, Hostname, RequestUri, TimeGenerated, ClientIp, Message
| join kind = inner(
AGWFirewallLogs
| where Action == "Blocked"
| extend transactionId_g = tostring(TransactionId)) on TransactionId
| extend Uri = strcat(Hostname,RequestUri)
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), TransactionID = make_set(transactionId_g,100), Message = make_set(Message,100), Total_TransactionId = dcount(transactionId_g) by ClientIp, Uri, Action
| where Total_TransactionId >= Threshold