Graph consensus and vote information from Rob's experiment (May/June 2021)

Rob did recently a similar flooding experiment to the one behind #33076 (closed). We should do a respective analysis for the new experiment, too.

There is a thread on tor-relays@ and an entry on our status page with more details.

According to the older ticket here is what we should look into (copied over verbatim):

Basically, we want to have a standard way to graph results from key metrics from before, during, and after the experiment.

In this case, we want CDF-TTFB, CDF-DL from onionperf results.

We also want CDF-Relay-Stream-Capacity and CDF-Relay-Utilization for the consensus, as well as from the votes, to see if the votes from TorFlow drastically differ from sbws during the experiment.

https://trac.torproject.org/projects/tor/wiki/org/roadmaps/CoreTor/PerformanceMetrics

Here are additional things we should/could have on our radar:

1. Did the 5/10/15 sec overload issue appear in onionperf again?
2. Check if anything else happened in the long tail
3. How did the bytes written/read in extra-info descs look like during the experiment?
4. Why does measuring some relays break due to reaching the 15 sec circuit build timeout (reported by Rob during the experiment)?
5. How did overload lines develop during the experiment?