aks-preview 13.0.0b8

• `az aks create/update``: Update recording rule group create logic for managed prometheus addon

SHA256 hashes of the release artifacts:

bc5f4a233c9da20eb64bc22c5d1798520ff65a32640869904ca73771def160bd aks_preview-13.0.0b8-py2.py3-none-any.whl