(Munin is a system monitoring tool based on web interface. With it, you can instantly understand the performance and status of the system. Munin mainly monitors the system, process, network, disk and other aspects. From it, you can observe the file system occupancy, network traffic, number of processes, CPU and memory usage at any time. The main advantage of Munin is that it can collect and analyze information at the same time, so you do not need to install a web server on each node, and the additional information at the bottom of the details page can help you obtain the statistics of some important data)