What tools do you usually use for monitoring and diagnosing system status under Linux?

To monitor and diagnose the system status under Linux, I usually use the following tools:

• top or htop — to view current CPU, memory, and process loads.
• vmstat — for analyzing memory, process, and input/output usage.
• iostat — for monitoring disk activity.
• netstat or ss — to check network connections.
• dmesg — to view system messages and kernel errors.
• journalctl — for reading system journal logs.
• strace — for tracing system calls of a specific process.
• lsof — to view open files and sockets.

These tools allow for quick identification of bottlenecks, errors, and anomalies in system operation, which is important for timely response and troubleshooting.