willing to bet that 99.999% uptime is just static text, because 5+ hours out of 2190 hours is not 99.999%
Sorry, but true class isn't just elegant rectangles decorated by various subtle shades of gray sans serif.
if their status is a percentage of requests, then a relatively small number of 500s compared to a big total volume will be tiny, even if ongoing.
That's what I'd expect a reported number to be, since that's what a client experiences on average.