- atop : network usage
- htop : cpu / memory / io usage
- lsof : filesystem handle per pid
- rbspy : profile ruby application system call [https://github.com/rbspy/rbspy]
- cadvisor: dashboard to monitor container [https://github.com/google/cadvisor]
- jvisualvm : Live chart showing CPU / threads / Memory heap usage on the realtime java process.