Module metrics 

Metric collection and parsing for remote servers.

Metrics are gathered via SSH commands and parsed into typed values. All parsers return Option<f32> — they never panic. Unknown or truncated output results in None, which the UI renders as “N/A”.

Commands used per OS family:

• CPU: top -bn1 (Linux) / top -l 1 -n 0 (macOS)
• RAM: free -b (Linux) / vm_stat + sysctl hw.memsize (macOS)
• Disk: df -k /
• Uptime: uptime
• Load: cat /proc/loadavg (Linux only)

Severity thresholds: Ok < 60 % Warn 60–85 % Crit > 85 %

Enums

ThresholdLevel

Severity of a metric percentage. The UI maps each level to a colour.

Functions

parse_cpu_proc_stat

Parse CPU usage from Linux /proc/stat.

parse_cpu_top

Parse CPU idle percentage from Linux top -bn1 output.

parse_cpu_top_macos

Parse CPU usage from macOS top -l 1 -n 0 output.

parse_disk_df

Parse disk usage of / from df -k / output.

parse_loadavg

Extract load averages from cat /proc/loadavg output.

parse_ram_free

Parse RAM usage from Linux free -b output.

parse_ram_vmstat

Parse RAM usage from macOS vm_stat + sysctl hw.memsize output.

parse_top_processes

Parse the top processes by CPU usage from ps output.

parse_uptime

Extract the human-readable uptime string from uptime output.

threshold_level

Returns the severity level for a metric percentage.