Automating setup of keys for Release Annotations in App Insights during an automated Release

Microsoft has finally added this ability, though the documentation is not available at the time of this writing. For instructions on how to do it, see this UserVoice item for the issue :

https://visualstudio.uservoice.com/forums/357324-application-insights/suggestions/13607550-enable-creation-and-management-of-api-keys-via-pow?tracking_code=06b602f1fc962c339ed8bcf534fcdb2f#{toggle_previous_statuses}