Java performance monitoring framework, including PCP bridge
an open source solution to application performance monitoring for java server applications
A lightweight application monitoring framework
The LibratoReporter class runs in the background, publishing metrics to the Librato Metrics API at the specified interval.
The API for Erma, the extremely reusable monitoring API
EasyMetrics is a metrics framework to collect runtime usage information to indicate the realtime application performance.
ST-Metrics is a collection of aspects and annotations for recording method timing information in your Spring Boot application
Metrics + Hyperic Sigar for OS-level monitoring