About-page is caught by a wildcard which shows a slightly modified landing page with different prices.
Flexible layout could use some more testing. Choose plan buttons escape their parent boxes on the right at minimum width. Free trial button could use some vertical breathing room at min. width. Login and sign up links change colour (gray to blue) and go vertical.
There is a limit on metrics/sec, currently 50/sec, but we're trying to keep that limit high enough that people don't need to worry about it. We expect that most people won't hit the API directly and will use statsd instead.
Also: I understand this is likely your MVP website, but you should at least link to a page about Graphite, even if it's not on your website. And screenshots are going to really sell this thing.