Create Custom Filed under WVDTenantScale

as per MS article ,we can generate query ,but i cant see these fields ,i am sending almost all details to log analytics

Log Analytics
If you decided to use Log Analytics, you can view all the log data in a custom log named WVDTenantScale_CL under Custom Logs in the Logs view of your Log Analytics Workspace. We've listed some sample queries you might find helpful.

To see all logs for a host pool, enter the following query

Kusto

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WVDTenantScale_CL
| where hostpoolName_s == "<host_pool_name>"
| project TimeStampUTC = TimeGenerated, TimeStampLocal = TimeStamp_s, HostPool = hostpoolName_s, LineNumAndMessage = logmessage_s, AADTenantId = TenantId
To view the total number of currently running session host VMs and active user sessions in your host pool, enter the following query

Kusto

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WVDTenantScale_CL
| where logmessage_s contains "Number of running session hosts:"
or logmessage_s contains "Number of user sessions:"
or logmessage_s contains "Number of user sessions per Core:"
| where hostpoolName_s == "<host_pool_name>"
| project TimeStampUTC = TimeGenerated, TimeStampLocal = TimeStamp_s, HostPool = hostpoolName_s, LineNumAndMessage = logmessage_s, AADTenantId = TenantId
To view the status of all session host VMs in a host pool, enter the following query

Kusto

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WVDTenantScale_CL
| where logmessage_s contains "Session host:"
| where hostpoolName_s == "<host_pool_name>"
| project TimeStampUTC = TimeGenerated, TimeStampLocal = TimeStamp_s, HostPool = hostpoolName_s, LineNumAndMess