PRTG Manual: Windows MSMQ Queue Length Sensor
The Windows MSMQ Queue Length sensor reads the number of messages in a Microsoft message queue of the parent device.
For a detailed list and descriptions of the channels that this sensor can show, see section Channel List.
- Dutch: Windows MSMQ wachtrijlengte
- French: Windows MSMQ longueur de la file d'attente
- German: Windows MSMQ Queue-Länge
- Japanese: Windows MSMQ キュー長
- Portuguese: Comprimento da fila MSMQ Windows
- Russian: Длина очереди Windows MSMQ
- Simplified Chinese: Windows MSMQ 队列长度
- Spanish: Longitud de cola MSMQ Windows
- This sensor has a high performance impact. Use it with care. We recommend that you use no more than 200 sensors of this sensor type on each probe.
- This sensor requires that the Microsoft Message Queuing (MSMQ) service runs on both the probe system and the target system.
- This sensor requires Microsoft .NET 4.7.2 or later on the probe system. If the sensor shows the error PE087, additionally install .NET 3.5 on the probe system.
- This sensor requires credentials for Windows systems in the settings of the parent device.
- We recommend Windows Server 2012 R2 on the probe system for best performance of this sensor.
- This sensor supports the IPv6 protocol.
- See the Knowledge Base: How do I activate Message Queuing in my Windows installation?
You cannot add this sensor to the hosted probe of a PRTG Hosted Monitor instance. If you want to use this sensor, add it to a remote probe device.
Requirement |
Description |
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.NET 4.7.2 or later |
This sensor requires .NET 4.7.2 or later to be installed on the probe system (on every cluster node, if on a cluster probe).
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Windows credentials |
This sensor requires credentials for Windows systems in the settings of the parent device. Preferably, use Windows domain credentials.
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MSMQ service |
For this sensor to work, the MSMQ service must be started both on the target system and on the probe system. Additionally, the MSMQ service must also be started on the target computer. To enable the service, log in to the respective computer and open the services manager (for example, via services.msc). In the list, find the respective service and set its Start Type to Automatic. Depending on your Windows version, you might first need to install the MSMQ Server.
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The Add Sensor dialog appears when you manually add a new sensor to a device. It only shows the settings that are required to create the sensor. You can change nearly all settings on the sensor's Settings tab after creation.
The settings that you select in the Add Sensor dialog are valid for all sensors that you create when you finish the dialog.
Sensor Settings
Setting |
Description |
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Message Queues |
Select the message queues that you want to monitor. PRTG creates one sensor for each message queue that you select.
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Click the Settings tab of a sensor to change its settings.
Setting |
Description |
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Sensor Name |
Enter a name to identify the sensor. |
Parent Tags |
Shows tags that the sensor inherits from its parent device, parent group, and parent probe.
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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.
The sensor has the following default tags that are automatically predefined in the sensor's settings when you add the sensor:
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Priority |
Select a priority for the sensor. This setting determines the position of the sensor in lists. The highest priority is at the top of a list. Choose from the lowest priority ( |
Setting |
Description |
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Message Queue |
Shows the name of the message queue that this sensor monitors.
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Message Queue Type |
Shows the type of the message queue that this sensor monitors.
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Minimum Message Age |
Optionally define an age in minutes that the message must be for the sensor to count it. If you set a minimum message age, the sensor does not regard messages that are younger than this age. If you leave this field empty, the sensor does not check for the message age. Enter an integer value or leave the field empty. |
If Value Changes |
Define what the sensor does when the sensor value changes:
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Setting |
Description |
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Result Handling |
Define what PRTG does with the sensor result:
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Setting |
Description |
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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.
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Graph Type |
Define how different channels are shown for this sensor:
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Stack Unit |
This setting 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. We recommend that you change them centrally in the root group settings if necessary. To change a setting for this object only, click under the corresponding setting name to disable the inheritance and to display its options.
For more information, see section Inheritance of Settings.
Click to interrupt the inheritance.
Setting |
Description |
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Scanning Interval |
Select a scanning interval from the dropdown list. The scanning interval determines the amount of time that the sensor waits between two scans. Choose from:
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If a Sensor Query Fails |
Select the number of scanning intervals that the sensor has time to reach and to check a device again if a sensor query fails. Depending on the option that you select, the sensor can try to reach and to check a device again several times before the sensor shows the 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 the Warning status. Choose from:
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Schedules, Dependencies, and Maintenance Window
You cannot interrupt the inheritance for schedules, dependencies, and maintenance windows. The corresponding settings from the parent objects are always active. However, you can define additional schedules, dependencies, and maintenance windows. They are active at the same time as the parent objects' settings.
Setting |
Description |
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Schedule |
Select a schedule from the list. You can use schedules to monitor during a certain time span (days or hours) every week. Choose from:
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Maintenance Window |
Select if you want to set up a one-time maintenance window. During a maintenance window, monitoring stops for the selected object and all child objects. They show the Paused status instead. Choose between:
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Maintenance Begins |
This setting is only visible if you enable Set up a one-time maintenance window above. Use the date time picker to enter the start date and time of the one-time maintenance window. |
Maintenance Ends |
This setting is only visible if you enable Set up a one-time maintenance window above. Use the date time picker to enter the end date and time of the one-time maintenance window. |
Dependency Type |
Select a dependency type. You can use dependencies to pause monitoring for an object depending on the status of a different object. You can choose from:
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Dependency |
This setting is only visible if you enable Select a sensor above. Click |
Dependency Delay (Sec.) |
This setting is only visible if you select Select a sensor above. Define a time span in seconds for the dependency delay. After the master sensor for this dependency returns to the Up status, PRTG additionally delays the monitoring of the dependent objects by the time span you define. This can prevent false alarms, for example, after a server restart or to give systems more time for all services to start. Enter an integer value.
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Click to interrupt the inheritance.
Setting |
Description |
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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:
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Which channels the sensor actually shows might depend on the monitored device, the available components, and the sensor setup.
Channel |
Description |
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Downtime |
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 in percent. |
Execution Time |
The execution time in milliseconds (msec) |
Messages |
The total number of messages in the queue
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Knowledge Base
How do I activate Message Queuing in my Windows installation?
Which .NET version does PRTG require?
What security features does PRTG include?
For more information about sensor settings, see the following sections: