Update [#20495](https://trac.torproject.org/projects/tor/ticket/20495) entry to say it doesn't look like a block, but is still unknown. ([diff](https://trac.torproject.org/projects/tor/wiki/doc/MetricsTimeline?action=diff&version=28)) URL: https://trac.torproject.org/projects/tor/wiki/doc/MetricsTimeline?version=28