Is the inclusion of the `AZURE_HTTP_USER_AGENT` env var in requests a supported feature?

I have a separate command line tool that launches the Azure CLI and wanted to include my user agent string in calls made from the Azure CLI. I found the `AZURE_HTTP_USER_AGENT` variable which seems to fit the bill, but I only found it by browsing through the source code ([link](https://github.com/Azure/msrest-for-python/blob/4cc8bc84e96036f03b34716466230fb257e27b36/msrest/pipeline/universal.py#L70))

I found a document for what I believe is the predecessor to the Azure CLI (https://github.com/Azure/azure-xplat-cli/wiki/Environment-Variables) but I just wanted to confirm that this was still considered an official feature of the current CLI.