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This is what Linux itself reports in /proc/stat or through top.

When parsing /proc/stat we read user, nice, system, idle, iowait, irq, and softirq from the cpu line. Then we report the following values back to Panopticon:

• User = 100 * (user + nice) / total
• System = 100 * (total - user - nice - iowait) / total
• Iowait = 100 * iowait / total
• Idle = 100 * idle / total

where total = user + nice + system + idle + iowait + irq + softirq. Note that the System percentage reported contains the system, irq, and softirq timings reported by Linux. The System line includes all processes running in user mode, regardless of whether they are run as-is (user) or niced (nice). The values are reported within two floating points of precision e.g. 12.34 means 12.34%.

If access to /proc/stat is denied, the read value is empty, or there is no cpu line we fall back to running the system wide utility top using the command line LC_ALL=C top -n 1 -b. We then look for the CPU usage line. There are two possibilities.

If you have the BSD (also macOS) version of top, the line reads something like this:

CPU usage: 12.65% user, 17.72% sys, 69.62% idle

We then parse these values, reporting user as User, sys as System, and idle as Idle. In this case we do not report Iowait; we instead set it to NULL to indicate to Panopticon this information cannot be collected.

If you have the Linux version of top, the line reads something like this:

%Cpu(s):  0.6 us,  0.9 sy,  0.0 ni, 98.2 id,  0.3 wa,  0.0 hi,  0.0 si,  0.0 st

In this case we have the user, system, nice, idle, waiting, hardware interrupts, software interrupts, and stolen by hypervisor components. We sum them up as:

• User = us + ni
• Iowait = wa
• Idle = id
• System = sy + hi + si + st

If parsing the top output fails we return NULL for all values. 

Panopticon checks these values. If there are no values reported (all NULL) the CPU part of the Server Information page is not displayed at all.

When one or more values are non-NULL, it checks their values. When Idle is under 10.00 we print the message with the value between parentheses being 100 - Idle.

What you get means that either /proc/stat or top returned at least one non-zero value, and the reported Idle time is zero. I cannot think of any case where either /proc/stat or top would only report user and system but not idle times. If they get something else in /proc/stat or the top output as a non-privileged user I'd like to see it.