I see that it has activity now. I didn't hear other reports or see of this earlier today, so I am not sure what the issue was. Note that we have had some intermittent stability issues with public package manager, with more details from me on this (and fixes coming) in packagemanager.rstudio.com serves an HTTP 504 error with R-CMD-CHECK.yml on Ubuntu 18.04 - #3 by andreasr