is an open-source, MIT licensed, monitoring and alerting system by Stack Exchange. It has an expressive domain specific language for evaluating alerts and creating detailed notifications. It also lets you test your alerts against history for a faster development experience.

Try It

Want to jump right in? Follow our quick start tutorial to get Bosun, OpenTSDB, and scollector up quickly using our published docker images.

Download It

Download the prebuilt binaries for Bosun and our optional but valuable monitoring agent (Currently works only with OpenTSDB) scollector for Windows, Linux, and Mac.

Get Help

Join us in our Slack room. Get an invite. You can open issues on GitHub to report bugs or discuss new features.


Use Bosun's flexible expression language to evaluate time series in an exacting way

Create notifications using Bosun's template language: include graphs, tables, and contextual information

Save time by testing alerting against historical data and reduce alert noise before an alert goes into production

Supports querying OpenTSDB, Graphite, and Logstash-Elasticsearch

Runs on Linux, Windows, Mac, or any operating system supported by Go

Use our agent scollector to get monitoring of Windows, Linux, and many common applications

Supports arbitrary dimensions (not just host based), aggregations, and automatically incorporating new tags (hosts, services, ..) as they appear

Scollector auto detects new services and starts sending metrics immediately; properly designed alerts will apply to these new services which reduces maintenance