PRTG Manual: System Health Sensor
The System Health sensor monitors internal PRTG parameters. It shows the status of the probe system. PRTG automatically creates this sensor. You cannot delete it.
It checks various system parameters that can affect the quality of the monitoring results:
- Health: This index value sums up the probe state as a value between 100% (healthy) and 0% (failing). Investigate frequent or repeated health values below 100%.
- Available Memory: This channel shows 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 Percent: This channel shows the free memory available on the system in percent.
- System CPU Load: This channel shows the CPU load in percent on the probe system. Extensive CPU load can lead to false, incomplete, and incorrect monitoring results. This value should usually stay below 50%.
System Health Sensor
- Dutch: System Status
- French: État du système
- German: Systemzustand
- Japanese: システム正常性
- Portuguese: Funcionamento do sistema
- Russian: Работоспособность системы
- Simplified Chinese: 系统健康状况
- Spanish: Salud del sistema
Click the Settings tab of a sensor to change its settings.
Usually, a sensor connects to the IP Address or DNS Name of the parent device on which you created the sensor. See the device settings for details. For some sensors, you can explicitly define the monitoring target in the sensor settings. See below for details on available settings.
Setting |
Description |
|---|---|
Sensor Name |
Enter a meaningful name to identify the sensor. By default, PRTG shows this name in the device tree, as well as in alarms, logs, notifications, reports, maps, libraries, and tickets. |
Parent Tags |
Shows tags that this sensor inherits from its parent device, group, and probe. This setting is shown for your information only and cannot be changed here. |
Tags |
Enter one or more tags. Confirm each tag with the Spacebar key, a comma, or the Enter key. You can use tags to group objects and use tag-filtered views later on. Tags are not case-sensitive. Tags are automatically inherited. You can add additional tags to the sensor.
There are default tags that are automatically predefined in a sensor's settings when you add a sensor. See section Default Tags below. |
Priority |
Select a priority for the sensor. This setting determines where the sensor is placed in sensor lists. A sensor with a top priority is at the top of a list. Choose from one star (low priority) to five stars (top priority). |
systemhealthsensor
Setting |
Description |
|---|---|
Primary Channel |
Select a channel from the list to define it as the primary channel. In the device tree, the last value of the primary channel is always displayed below the sensor's name. The available options depend on what channels are available for this sensor.
|
Graph Type |
Define how different channels are shown for this sensor:
|
Stack Unit |
This field is only visible if you enable Stack channels on top of each other as Graph Type. Select a unit from the list. All channels with this unit are stacked 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. |
By default, all of the following settings are inherited from objects that are higher in the hierarchy and should be changed there if necessary. Often, best practice is to change them centrally in the root group settings. For more information, see section Inheritance of Settings. To change a setting for this object only, disable inheritance by clicking the button next to inherit from under the corresponding setting name. You then see the options described below.
Click 
to interrupt the inheritance. See section Inheritance of Settings for more information.
Setting |
Description |
|---|---|
Scanning Interval |
Select a scanning interval (seconds, minutes, or hours). The scanning interval determines the amount of time that the sensor waits between two scans. You can change the available intervals in the system administration on PRTG on premises installations. |
If a Sensor Query Fails |
Define the number of scanning intervals that the sensor has time to reach and check a device again in case a sensor query fails. Depending on the option that you select, the sensor can try to reach and check a device again several times before the sensor shows a Down status. This can avoid false alarms if the monitored device only has temporary issues. For previous scanning intervals with failed requests, the sensor shows a Warning status. Choose from:
|
Click to interrupt the inheritance. See section Inheritance of Settings for more information.
Setting |
Description |
|---|---|
User Group Access |
Define the user groups that have access to the sensor. You see a table with user groups and group access rights. The table contains all user groups in your setup. For each user group, you can choose from the following group access rights:
|
Click to interrupt the inheritance. See section Inheritance of Settings for more information.
Setting |
Description |
|---|---|
Channel Unit Types |
For each type of channel, define the unit in which data is displayed. If defined on probe, group, or device level, these settings can be inherited to all sensors underneath. You can set units for the following channel types (if available):
|
To change display settings, spike filtering, and limits, switch to the sensor's Overview tab and click the gear icon of a specific channel. For detailed information, see section Sensor Channel Settings.
Click the Notification Triggers tab to change notification triggers. For detailed information, see section Sensor Notification Triggers Settings.
For more general information about settings, see section Object Settings.
For information about sensor settings, see the following sections:
