Logstash with Kibana (after the initial learning hassle) is excellent for numerical data. It's a replacement for Graphite in some cases.
miniblog.
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Use @logstash and Emacs? I've released a major mode for editing config files! https://github.com/Wilfred/logstash-conf.el http://t.co/xMMJ2tt5Y1
Compiled logstash-forwarder (a Go program) in 2.8 seconds. Impressive!
The logstash project principles are something I'd like to see in more projects: