Grafana dashboard for plotting the metrics

[JossWhittle]

Data is going to be recorded as a series of sparse records where x=timestamp and y=0 or 1 for if the request was successful.

That can be plotted as a regular line plot with a marker on each entry. You'll need to partition on the name of the CanaryHTTPMonitor and on the Node Name / DaemonSet Pod that the metric was recorded from for each url so they all get their own line.

The entries will be slightly irregularly spaced, and also a binary 0 or 1 will be very spiky if we are having issues.

In order to plot it smoothed we'll need to aggregate over a sliding time window it so that becomes an availability % over time.

Implement this dashboard using https://github.com/weaveworks/grafanalib and generate the json from it locally and commit it into the repo. We'll work out CI for the in the longer term but I can't see the dashboard changing that much once we get these plots working.

• Graph of raw data as line plot.
• Graph of time window averaged data as a % line plot.
• Graph of how long each request took as a line plot.