If you go to the NOAA ASCAT page for METOP-A, you'll see the following message:
The ASCAT instrument on Metop-A's mission ended on November 15, 2021. Metop-A was launched on 19 October 2006 and operated a little over 10 years beyond its design life. You can find more information at https://www.eumetsat.int/plans-metop-end-life.
Frequent users of ASCAT data already know that METOP-A was METOP-B had very similar orbits and datasets, so this isn't a huge data loss at all. Both METOP-B and METOP-C are still functioning and providing near real-time ocean surface wind data.