What ubuntu version is used? Will it be upgraded to 20.04 soon?

(Crosspost, or crosstweet, from https://twitter.com/daattali/status/1356734056319320066 so that there'll be a more permanent answer)

Is there any way to know what linux distribution exactly is running on shinyappsio? From looking at the versions of installed system packages I assume it's ubuntu 16.04 , but is there an explicit place that's mentioned?

Secondly, as ubuntu 16.04 is approaching the end of its maintenance phase in 2 months, are there plans on upgrading to 20.04?