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Linux - incorrect Idle time values from /proc/uptime

I am curious as to why I am getting an incorrect Idle Time from the /proc/uptime on my server. Output of cat /proc/uptime from my server: $> cat /proc/uptime: 1218960.08 15958635.85 $> ...
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How does Heartbeat determine when to switch to the secondary? Can you force it to switch?

I've been trying to understand exactly how Heartbeat works - I understand how when one server dies, it switches to the backup. But, for me, it also switches when the primary has a large increase in ...
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Considering no website/service is 100% up, how do systems measure web downtime with precision?

I think the title speaks for itself. But, to give an example: In a recent post, 37 signals show it's real downtime and compares with other web services. They get very few down time and probably most ...