Today, 26th September 2024, ADS-Beta has officially become the new ADS: https://ads.atmosphere.copernicus.eu/
Please see separate announcement for details: Goodbye legacy ADS, Hello New Atmosphere Data Store (ADS)!
API users: there is no immediate action to take but you are advised to update the URL in your .cdsapirc file at your earliest convenience by 20th October 2024. Thank you.