That I don't know. I'll defer to @gopher.ny or a community member who might happen to know, but my guess is that the threshold for the alert is more or less arbitrary, though one they happen to think is likely to be concerning, (Unless, from what I recall them mentioning, you didn't recently did something intense, like rebooting the hub and letting apps/drivers initialize--if it calms down on its own in short time. Rebooting is otherwise a good idea in this case.)
If I had to guess, I would bet that is the cpu load average, like what you would see on a Unix based system. I believe the hubs are quad core, so a value of 4 would effectively reflect that all 4 cores were busy.
The number is 15 minute average load as reported by uptime Unix command.
Here is the detailed explanation of those numbers, perhaps too detailed...
In a nutshell, number 2 means that hub's 4 CPU cores are 50% busy over 15 minutes or longer. Consistently high loads come with a possibility of thermal radio shutdown.
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Thanks for sharing the reasons why high CPU load are reported @gopher.ny, perhaps it would be worth making this a thread of it's own, including any similar thresholds that trigger warnings? Unless there is a thread that already outlines this...?
To see which apps/drivers cause high CPU load, check out Logs page, Apps and Drivers tabs. There are some useful metrics there, although most columns are hidden by default.
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So how do we unhide the hidden columns?
Use the checkboxes at the top of the page to toggle the display of the metrics you're interested in.
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Could be right, I don't have 2.2.5 to test on anymore. Hope I didn't give away any secrets, but mod my post if I did, I suppose? 
As you are using 2.2.6 (beta) at least we know something is coming soon.
What other juicy bits are in there? 
Nothing interesting to see here, move along...
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Just need to keep an eye on the threads popping in and suddenly disapearing as the beta testers forget to post in the beta only categories. 
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Bit of a side query while following this.
Logs show Uptime: 2264d 19h 14m 33s and I shutdown yesterday and have only had the hub for 2 months, not 6+ years
Someone else reported this in another thread.
Can't remember what the answer was though. Sorry.
Getting Severe CPU Load alerts again. There are a lot of checkboxes to choose from. Which will help me track down the cause?
I just turn them all on.
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I usually start with % of total, and then work from there…
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