It shouldn't have come as a surprise if you're keeping up to date on global automotive news. Mitsubishi Motors have been in financial trouble for a few years, and despite the Renault/Nissan group being created it's not been quite enough. They announced the end of the Pajero in the EU/Japan market in 2019, and this week the end of it in other markets too. There has been speculation for a while that since Renault, Nissan and Mitsubishi are now building cars on a common platform that they would scale back some models in some markets so they're not directly competing with effectively the same car with a different badge.
So as a result, Mitsubishi parts and servicing will continue as normal in UK/EU, as well as sales of existing models. Nissan are reducing sales in some areas too but as they have a much larger presence in the USA and EU, we're likely to see some reduction in available new models from them too. Renault haven't announced anything yet, but there are rumours they will agree to reduce models in markets where Mitsubishi or Nissan need them to.
Subaru have pretty much pulled out of UK/EU (only a couple of models for sale) for similar financial reasons. They're concentrating on the USA and Japan, Australia/NZ as their core markets now.