Quite new to Home Assistant – so a little unsure on how to approach this. Pleas steer me in the right direction if this forum post shouldn’t have been the place to start. 
Met.no locationforecast API version 2.0 is soon to be released
https://api.met.no/weatherapi/locationforecast/2.0/documentation
This version (2.0) is currently in beta and should not yet be used in production. [In finalizing stage, please check User-Agent header as per TOS]
This should be noted:
AUTHENTICATION
We had originally planned to launch a token-based authentication scheme for version 2.0, however this has been postponed to a later date. As a consequence we have implemented stricter access controls in regards to the identification requirements in the Terms of Service, which state that you must send a unique identifier in the User-Agent header. Any requests with a prohibited or missing User-Agent will receive a 403 Forbidden error.
Will this impact the Home Assistant onboarding integration?
CHANGELOG
version 2.0 : 2019-04-02
- Beta period nearing completion.
- XML is now split into different “classic” method.
- Stricted controls on User-Agent header to avoid throttling.
No news on retirement date for version 1.9.