Visualization of testnet loadgen data (streaming)

[mhofman]

Summary

This issue is about a visualization dashboard for a long running loadgen against an existing chain (testnet / devnet).

Context

The loadgen tool supports connecting to an existing testnet, which is planned to be used to put load on a testnet or devnet over long period of time, with support for restarts. See Agoric/agoric-sdk#2630

There is a visualization dashboard planned the daily perf usage of the loadgen, but the data to be visualized mostly deals with regression over time by differentiating over loadgen stages or sdk revisions (see #63)

Details

We need a live visualization dashboard for the testnet case where the relevant loadgen data is streamed and plotted over the life of the chain, without requiring stages to get linear regressions, or restarts to capture the data generated. There may or may not be overlap with how the data from the daily perf run is fed into that dashboard. The data to be represented is detailed in Agoric/agoric-sdk#2630.