Setup

Github Link: Glances.
Glances is an open-source system cross-platform monitoring tool. It allows real-time monitoring of various aspects of your system such as CPU, memory, disk, network usage etc.
It also allows monitoring of running processes, logged in users, temperatures, voltages, fan speeds etc. It also supports container monitoring.
The information is presented in an easy to read dashboard and can also be used for remote monitoring of systems via a web interface or command line interface.
It is easy to install and use and can be customized to show only the information that you are interested in.

        cd ~
        python3 -m venv ~/.venv
        source ~/.venv/bin/activate
        pip install glances
        

Now we have to add this as a service on the pi to start it up on boot.

        [Unit]
        Description=Glances Web Server
        After=network.target

        [Service]
        # Run as your user to match the venv location
        User=piserver
        Group=piserver
        WorkingDirectory=/home/piserver

        # Activate the venv and run glances
        # We use bash -c to ensure the venv is sourced correctly in the daemon context
        ExecStart=/home/piserver/.venv/bin/python -m glances -w --bind 0.0.0.0 -u highseas --config /home/piserver/.config/glances/glances.conf

        # Optional: Restart if it crashes
        Restart=always
        RestartSec=5

        # Security: Restrict network access if possible (optional but recommended)
        # PrivateNetwork=false

        [Install]
        WantedBy=multi-user.target
        

Now for the contents of the config file:

        [general]
        # Refresh every 3 seconds to save CPU cycles on the Pi
        refresh_rate = 3

        [cpu]
        enable = True
        show = True
        # Alert thresholds for CPU
        warning = 80
        critical = 95

        [memory]
        enable = True
        show = True
        warning = 85
        critical = 95

        [fs]
        enable = True
        show = True
        # Warn if disk is > 90% full
        warning = 90
        critical = 95

        [diskio]
        enable = True
        show = True
        # Shows Read/Write speed (crucial for SD card health)

        [net]
        enable = True
        show = True
        # Shows Network traffic

        [gpu]
        enable = True
        show = True
        # This forces Glances to try and read VideoCore stats
        # Note: 'temp' might still show N/A if the specific sensor path isn't detected
        # but it will show the memory usage correctly.

        [sensors]
        enable = True
        show = True
        # This plugin usually picks up 'core_temp' for the CPU on Raspberry Pi
        # which solves the "temp: N/A" issue you saw earlier.

        [temperature]
        enable = True
        show = True
        warning = 70
        critical = 80