<%NUMBERING1%>.<%NUMBERING2%>.<%NUMBERING3%> PRTG Manual: System Health Sensor

The System Health sensor monitors the status of the probe system. It checks various system parameters that can affect the quality of the monitoring results.

i_round_bluePRTG automatically creates this sensor. You cannot delete the sensor if it was created automatically. If you manually create the sensor, you can delete it.

System Health Sensor

System Health Sensor

i_square_cyanFor a detailed list and descriptions of the channels that this sensor can show, see section Channel List.

Sensor in Other Languages

  • Dutch: Systeemstatus
  • French: État du système
  • German: Systemzustand
  • Japanese: システム正常性
  • Portuguese: Saúde do sistema
  • Russian: Работоспособность системы
  • Simplified Chinese: 系统健康状况
  • Spanish: Salud de sistema


Consider the following remarks and requirements for this sensor:



Performance impact

  • This sensor has a very low performance impact.


  • This sensor has predefined limits for several metrics.

Basic Sensor Settings

Basic Sensor Settings

Basic Sensor Settings

The sensor has the following default tags that are automatically predefined in the sensor's settings when you add the sensor:

  • systemhealthsensor

i_square_cyanFor more information about basic sensor settings, see section Sensor Settings.

Sensor Display

Sensor Display

Sensor Display



Primary Channel

Select a channel from the list to define it as the primary channel. In the device tree, PRTG displays the last value of the primary channel below the sensor's name. The available options depend on what channels are available for this sensor.

i_round_blueYou can set a different primary channel later by clicking b_channel_primary below a channel gauge on the sensor's Overview tab.

Graph Type

Define how this sensor shows different channels:

  • Show channels independently (default): Show a graph for each channel.
  • Stack channels on top of each other: Stack channels on top of each other to create a multi-channel graph. This generates a graph that visualizes the different components of your total traffic.
    i_round_redYou cannot use this option in combination with manual Vertical Axis Scaling (available in the channel settings).

Stack Unit

This setting is only visible if you select Stack channels on top of each other above.

Select a unit from the list. PRTG stacks all channels with this unit on top of each other. By default, you cannot exclude single channels from stacking if they use the selected unit. However, there is an advanced procedure to do so.

Inherited Settings

By default, all of these settings are inherited from objects that are higher in the hierarchy. We recommend that you change them centrally in the root group settings if necessary. To change a setting for this object only, click b_inherited_enabled under the corresponding setting name to disable the inheritance and to display its options.

i_square_cyanFor more information, see section Inheritance of Settings.

Channel List

i_round_blueWhich channels the sensor actually shows might depend on the target device, the available components, and the sensor setup.



Available Memory

The amount of free memory available on the system. This value should not fall below 500 MB. This way, PRTG can still request resources during report generation or auto-discoveries, for example.

Available Memory %

The available memory (%)

System CPU Load

The CPU load (%). Extensive CPU load can lead to false, incomplete, and incorrect monitoring results. This value should usually stay below 50%.

i_round_blueThis channel has default limits:

  • Upper error limit: 90%
  • Upper warning limit: 50%


In the channel table on the Overview tab, this channel never shows any values. PRTG uses this channel in graphs and reports to show the amount of time in which the sensor was in the Down status


The sum of the system status as a value between 100% (healthy) and 0% (failing). Investigate frequent or repeated health values below 100%.

i_round_blueThis channel is the primary channel by default.


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