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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 ...
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Uwsgi Fallback Strategies

I'm giving some thought to application redundancy, and I was wondering what the best-practices are for improved reliability using uwsgi fallback features. Specifically, I had two thoughts: 1) We ...