We would like to automate scale up of streaming units for certain stream analytics job if the 'SU utilization' is high. Is it possible to achieve this using PowerShell? Thanks.
Firstly, as Pete M said, we could call REST API to create or update a transformation within a job.
Besides, Azure Stream Analytics Cmdlets New-AzureRmStreamAnalyticsTransformation
could be used to update a transformation within a job.