Server Density
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Server Density is a web application that monitors important server metrics such as load average and memory usage alerting you via e-mail or SMS when things go wrong.

Available as a hosted service or standalone, installed on your own servers, each monitored server runs a lightweight, open source monitoring agent which reports data back every 60 seconds.

Reported data is graphed for the last 30 days, or the time range you specify. Graphs are zoomable and the highest, lowest and average values over the time period are displayed for each check.

You can set up as many alerts as you wish for customisable thresholds, sent via e-mail or SMS. Choose how long to wait before triggering and how often the alert should be sent.

Milestones
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Server Density — Product launches out of beta (6/1/09)

Posted 6/1/09 at 1:31pm
Server Density — Public beta testing started (4/6/09)

Posted 4/6/09 at 5:07am
Server Density — Private beta testing started. (3/9/09)

Posted 3/18/09 at 2:28am