He's doing announcements and withdraws of a bunch of /24s and a few other prefixes (including a few IPv6). The green bars are showing that a specific prefix was visible in the global routing table at a specific point in time (and the absence of green indicating it was not globally routed).

Thanks for this. Appreciate the response I wasn't complaining about the content, just the lack of context.

You could click on it, and then look up what BGP is...

Not sure about uninteresting, maybe you just want to know why/how.