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Notify about health state

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⬅️ Go back to main README

ℹ️ Info: This script can not be used on its own but requires the base installation. See main README for details.

Description

This script is run from scheduler periodically, sending notification on health related events. Monitoring CPU and RAM utilization (available processing and memory resources) works on all devices:

  • high CPU utilization
  • high RAM utilization (low available RAM)

With additional plugins functionality can be extended, depending on sensors available in hardware:

  • voltage jumps up or down more than configured threshold
  • voltage drops below hard lower limit
  • fan failed or recovered
  • power supply failed or recovered
  • temperature is above or below threshold

⚠️ Warning: Note that bad initial state will not trigger an event! For example rebooting a device that is already too hot will not trigger an alert on high temperature.

Sample notifications

CPU utilization

check-health notification cpu utilization high
check-health notification cpu utilization ok

RAM utilization (low available RAM)

check-health notification ram utilization high
check-health notification ram utilization ok

Voltage

check-health notification voltage

Temperature

check-health notification temperature high
check-health notification temperature ok

PSU state

check-health notification state fail
check-health notification state ok

Requirements and installation

Just install the script and create a scheduler:

$ScriptInstallUpdate check-health;
/system/scheduler/add interval=53s name=check-health on-event="/system/script/run check-health;" start-time=startup;

ℹ️ Info: Running lots of scripts simultaneously can tamper the precision of cpu utilization, escpecially on devices with limited resources. Thus an unusual interval is used here.

Plugins

Additional plugins are available for sensors available in hardware. First check what your hardware supports:

/system/health/print;

Then install the plugin for fan and power supply unit state:

$ScriptInstallUpdate check-health,check-health.d/state;

... or temperature:

$ScriptInstallUpdate check-health,check-health.d/temperature;

... or voltage:

$ScriptInstallUpdate check-health,check-health.d/voltage;

You can also combine the commands and install all or a subset of plugins in one go:

$ScriptInstallUpdate check-health,check-health.d/state,check-health.d/temperature,check-health.d/voltage;

Configuration

The configuration goes to global-config-overlay, these are the parameters:

  • CheckHealthTemperature: an array specifying temperature thresholds for sensors
  • CheckHealthVoltageLow: value (in volt*10) giving a hard lower limit
  • CheckHealthVoltagePercent: percentage value to trigger voltage jumps

ℹ️ Info: Copy relevant configuration from global-config (the one without -overlay) to your local global-config-overlay and modify it to your specific needs.

Also notification settings are required for e-mail, matrix, ntfy and/or telegram.

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