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