Facebook engineer Sean Lynch has built a mind-blowing, custom server-monitoring tool for the company that uses heat mapping to keep tabs on a huge number of servers at a glance. Lynch is part of the cache performance team at Facebook. When things go wrong he needs to know quickly whether problems are being caused by caching or something else. Off the shelf monitoring tools just weren't good enough.Source: http://feedproxy.google.com/~r/Techcrunch/~3/d_FboqIIN9s/
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