2021-03-04 15:28:46 WARNING (MainThread) [homeassistant.loader] No 'version' key in the manifest file for custom integration 'philips_ambilight'. This will not be allowed in a future version of Home Assistant. Please report this to the maintainer of 'philips_ambilight'
Custom integrations now require a version key in their manifest file, this also means that all custom integrations now require a manifest file.
If you are using a legacy custom integration like custom_components/awesome.py this now needs to move to custom_components/awesome/init.py so you can add custom_components/awesome/manifest.json to it.
Current dev build of HA shows this warning:
2021-03-04 15:28:46 WARNING (MainThread) [homeassistant.loader] No 'version' key in the manifest file for custom integration 'philips_ambilight'. This will not be allowed in a future version of Home Assistant. Please report this to the maintainer of 'philips_ambilight'
More info can be found here: https://www.home-assistant.io/blog/2021/03/03/release-20213/#breaking-changes see Custom integrations: Version warning: