The first 60 seconds

Uptime - Load averages to identify is load is decreasing or increasing over 1, 5, and 15 minute averages dmesg -T | tail - Kernel errors including OOM events vmstat -SM 1 - System-wide statistics: run queue length, swapping, overall CPU usage mpstat -P ALL 1 - Per-CPU balance: a single busy CPU can indicate poor thread scaling pidstat 1 - Per-process CPU usage: identify unexpected CPU consumers, and user/system CPU time for each process. iostat -sxz 1 - Disk I/O statistics: IOPS and throughput, average wait time, percent busy. free -m - Memory usage including the file system cache sar -n DEV 1 - Network device I/O: packets and throughput sar -n TCP,ETCP 1 - TCP statistics: connectionrates, retransmits top - check overview