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Since it's running on CEST (Central European Standard Time), and just for today, yes, the red bar is downtime.

It was indeed down in the early morning.

I just asked Trevor what was going on. Apparently we turned off the restart-HN process back when we were hacked a few days ago, and we forgot to turn it back on. Things should be back to normal now.

I just asked Trevor what was going on.

Now you got me really confused. I assumed tlb==Trevor.

Oops, that was me. I was using Trevor's computer when I typed that.

Further, what's the y axis?

It looks like it's just up or down on the y-axis. RRDTool is often used to generate more complex graphs, so something this simple isn't always the most intuitive.

The monitor checks HN once per minute and records a 0 for up or a 1 for down in the database.

RRDTool then averages these values out nicely so that, for example, when the graph is at weekday-resolution and you see a 50% filled bar spanning one day, then HN was down half of that day.