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Open source Java APM

(Very) easy to use

Download and unzip, add -javaagent:path/to/glowroot.jar to your application's JVM args, point your browser to http://localhost:4000, and see all this!

Very (very) low overhead

Overhead depends on many factors, but is generally in the low microseconds due to extensive microbenchmarking and tuning of Glowroot itself.

Get to the root

Glowroot helps you get to the root of application performance issues.