Sysstat
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NLOAD
nload is a lightweight, terminal-based network traffic monitor. It displays real-time inbound and outbound bandwidth usage per network interface and is commonly used for quick diagnosis of network activity on a VPS or Linux server.
NETDATA
Netdata is a real-time infrastructure monitoring tool that provides high-resolution metrics for servers and applications. It is commonly used on VPS environments to observe CPU, RAM, disk I/O, network traffic, system load, processes, containers, and many service-level metrics with minimal setup.