we had used metrics library of theirs for some of our projects while evaluating, quite a while back. It was worthwhile for minute scale testing and was interest

we had used metrics library of theirs for some of our projects while evaluating, quite a while back. It was worthwhile for minute scale testing and was interesting to note that it had a few things worth abstracting from an instrumentation framework standpoint. It integrates with all common monitoring tools/frameworks and best part was its JMX integration which seemed to be more lightweight compared to a few other commercial ones we tried. We then stopped instrumenting for other reasons.