in src/Serilog.Sinks.AzureDataExplorer/AzureDataExplorerSinkOptions.cs [238:243]
public AzureDataExplorerSinkOptions WithAadUserAssignedManagedIdentity(string applicationClientId)
{
AuthenticationMode = AuthenticationMode.AadUserManagedIdentity;
ApplicationClientId = applicationClientId;
return this;
}