Open Source Monitoring ToolsThis document summarizes and compares several open source monitoring tools: Nagios, Graphite, StatsD, Logstash, and Sensu. Nagios is introduced as a commonly used tool that some love and some find frustrating. Graphite is described as a tool for storing and graphing time-series data. StatsD aggregates counters and timers and sends them to backend services like Graphite. Logstash is an tool for man
