So to me, this seems to be a bug in how this graph is calculated/drawn as the splits seem to be incorrect to me.
My timezone is at a half-hour break (+0930 UTC), and the graph looks to be calculated on the hour, not when the local system’s time is, making the chart look incorrect.
- OffPeak: 0100-0600
- Peak: 0600-1000
- Shoulder: 1000-1500
- Peak: 1500-0100
So if you ask me the very first bar should only be light blue and not have the top half as that is the 1 AM time, which should be the next bar. As all the time splits are on the hour, and not on the half hour, all the bars should be one colour each.
Should this be submitted as a bug? Besides this is seems to be working mostly alright.