Preview - TI map Domain entity to Cloud App Events

let dt_lookBack = 1h;
let ioc_lookBack = 14d; 
let list_tlds =
  ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true and ExpirationDateTime > now()
| where isnotempty(DomainName)
| extend DomainName = tolower(DomainName)
| extend parts = split(DomainName, '.')
| extend tld = parts[(array_length(parts) - 1)]
| summarize count() by tostring(tld)
| summarize make_set(tld);
let Domain_Indicators =
  ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true and ExpirationDateTime > now()
| extend TI_DomainEntity = DomainName
| where isnotempty(TI_DomainEntity);
  Domain_Indicators
| join kind=innerunique (
  CloudAppEvents
| extend IngestionTime = ingestion_time()
| where IngestionTime > ago(dt_lookBack)
| extend PAUrl = columnifexists("RequestURL", "None")
| extend Domain = trim('"', tostring(parseurl(PAUrl).Host))
| extend Domain = tolower(Domain)
| extend parts = split(Domain, '.')
| extend tld = parts[(array_length(parts) - 1)]
| extend CloudAppEvents_TimeGenerated = TimeGenerated) on $left.TI_DomainEntity == $right.Domain
| where CloudAppEvents_TimeGenerated < ExpirationDateTime
| summarize CloudAppEvents_TimeGenerated = argmax(CloudAppEvents_TimeGenerated, *) by IndicatorId
| extend Description = max_CloudAppEvents_TimeGenerated_Description, ActivityGroupNames = max_CloudAppEvents_TimeGenerated_ActivityGroupNames, ThreatType = max_CloudAppEvents_TimeGenerated_ThreatType, ExpirationDateTime = max_CloudAppEvents_TimeGenerated_ExpirationDateTime, ConfidenceScore = max_CloudAppEvents_TimeGenerated_ConfidenceScore, DomainName = max_CloudAppEvents_TimeGenerated_DomainName, ProviderName = max_CloudAppEvents_TimeGenerated_IndicatorProvider, AlertSeverity = max_CloudAppEvents_TimeGenerated_ThreatSeverity, IPAddress = max_CloudAppEvents_TimeGenerated_IPAddress
| project CloudAppEvents_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, DomainName, ProviderName, AlertSeverity, IPAddress