[BillinghamJ]

They seem to be a significant target for DDOS attacks, which seem to have been quite frequent.

That uptime measure is for the application server, which I suspect does not include GitHub Pages which is hosted separately on static content servers.

Lastly, 99.9% uptime over a month means 43 minutes of downtime. To me, that sounds like quite a lot.

[darrenkopp]

The likelyhood that you have downtime at the exact same time GitHub does is fairly low though.