If you try to sign in to the Canadian government tax service website this month, you’ll be greeted with with a polite request to wait your turn:

I’m fascinated by this on several levels. First, I like that it’s a simple request. If you have an urgent need, you could ignore it and sign-in anyhow. It didn’t involve a complex new sign-in management feature in their web application.
On the other hand, I’m curious about what the bottlenecks are, and why is it OK for anyone to sign in on Fridays, Saturdays, and Sundays?
Government services at this scale are complex and often involve many different systems, likely some very old and fragile (think, mainframe). I imagine this is why they want to segment the traffic.
Related: the Canadian Digital Service is (always) hiring https://digital.canada.ca/join-our-team in case you or others want to make our government services better. More than ever, this stuff is important.