PSI Probe 是一个 Lambda Probe 的后续版本，主要是为了替换 Tomcat 自带的管理器，可方便的管理和监控 Tomcat 实例。
主要特性：
Requests: Monitor traffic in real-time, even on a per-application basis.
Sessions: Browse/search attributes, view last IP, expire, estimate size.
JSP: Browse, view source, compile.
Data Sources: View pool usage, execute queries.
Logs: View contents, download, change levels at runtime.
Threads: View execution stack, kill.
Connectors: Status, usage charts.
Cluster: Status, usage charts.
JVM: Memory usage charts, advise GC
Java Service Wrapper: Restart JVM.
System: CPU usage, memory usage, swap file usage.
