The Shiny server's github repository looks effectively unmaintained and has two semi-recent PRs (one deals with an imminent google analytics deprecation and the other improves POSIX-compatibility and simplifies integration with FreeBSD) that haven't gotten any traction. How can these PRs get merged?
Relevant aside: I've been using shiny server for two applications for about 18 months and it was reasonable to install/setup (I've done it twice about 8 months apart after I decided to create a standby VM) as long as you install node and npm directly instead of trying to use the included (x86-64 only and specific to Linux) node binaries.