Nexus 6P will probably soon reach its EOL (end of life) status, as the phone is most likely not being manufactured any longer. Even those customers who turn in their Nexus 6P units for repair are offered other models in case their phones are beyond repair and must be replaced.
Not sure if this is a good or bad thing, but if your Nexus 6P has issues that aren’t related to software, then you might be in luck. It appears that Google is now replacing all Nexus 6P phones with Pixel XLs if the former is under warranty.
Unfortunately, this seems to apply in the United States and Canada …