PRTG Manual: Review Monitoring Data
Probe, group, device, and sensor pages have tabs that you can use to navigate between different options. For example, you can view your network's status, view monitoring results, or change settings.
The Overview tab shows an overview of the selected object and its sensors. The pages share a common structure, but some elements differ depending on the type of object.
Probes and Groups
The tab shows a tree-like view with devices and sensors, a geographical map, as well as graphs for different time spans of the probe or group.
You can turn off the sensor recommendation and disable the table list in the system administration settings under Monitoring.
The tab shows sensor details, the sensor status, gauges, graphs for different time spans, a table list with all channels, as well as similar sensors.
Assign 4-star () or 5-star () priorities to sensors to display their gauges on your devices' Overview tabs. Sensors with a 5-star priority are represented by larger gauges than sensors with a 4-star priority.
Gauges are the visual representation of channel values that you can use as a quick status indicator.
- Red and yellow sections of gauges correspond to the error and warning limits of the channel settings.
- Device Overview tabs only show gauges of high-priority sensors with 4 stars () or more.
- Sensor Overview tabs show gauges of all channels except the Downtime channel, regardless of their priority. The primary channel is displayed with a larger gauge.
- Channels that display binary values such as on/off or successful/failing because of their lookup configuration are visualized as switches, not as gauges. Switches only show a gray or a green color for their respective two states.
- The x-bar symbol () in gauges shows the mean of the returned values.
For the gauge to remain legible, we recommend that you stay below 120 lookup values for primary channels of sensors with a 5-star priority. For sensors with a priority of 4 stars, the recommended limit is about 40 lookup values.
Toplists are only available for xFlow and Packet Sniffer sensors. Toplist graphs are displayed directly on the sensor's Overview tab.
For more information, see section Toplists.
Select one of the tabs Live Data (only available for sensors), 2 days, 30 days, or 365 days to display an object's live monitoring data (only sensors), or to display data for different time spans and in more or less detail. The time that graph legends and data tables show depends on the time zone settings for the logged-in user.
The time spans that are mentioned here are the default settings. You can change the shown days for the different graphs in the system administration settings under User Interface.
Graphs label the minimum and maximum values of a sensor's primary channel and the minimum and maximum values of the Response Time Index of other objects. A maximum value of 100% is not labeled.
For probes, groups, and devices, each of the tabs shows a summary graph for the selected object and mini graphs for all sensors on the object, as well as a data table for the object. For performance reasons, PRTG never displays more than 50 mini graphs. Hover over a mini graph to display the graph legend.
Summary graphs show the number of alarms as well as three index graphs. These graphs indicate the response time, the CPU load, and the bandwidth usage for all sensors. Index graphs are similar to a stock index. The values are based on the readings of all sensors of this object. To compute these values, PRTG uses statistics and compares the values to the highest and lowest readings that have ever been recorded.
The three index graphs show trends in your network. If the values increase over a certain time span, this means that the CPU load, the bandwidth usage, or the response time have gotten worse during this time. For example, a CPU Load Index value of 90% means that the average CPU load for all CPU sensors of your configuration is at 90% of the highest ever measured CPU load value.
The following channels are available in the summary graph:
Sums up the number of all Down states of sensors on this object during the specified time span. This graph provides you with a bird's eye view of your network issues.
Response Time Index
Indicates the request times in your network.
CPU Load Index
Indicates the CPU load in your network.
Indicates the bandwidth usage in your network.
For more details about index graphs, see the Knowledge Base: How does PRTG compute CPU Index, Traffic Index and Response Time Index?.
You can individually hide single channels except the Alarms channel. To do this, disable the check box next to a channel name below the graph, and the corresponding channel's line disappears. You can also click Show all or Hide all in the lower-right corner to show or hide all channels. The graph view is immediately adjusted.
For sensors, each tab shows a graph and data table for the selected sensor. When you view the data of a sensor that runs on a cluster probe, you can additionally select if you want to show the data of all cluster nodes, or only of one specific cluster node. Use the Show Data of option above the graph.
PRTG never displays graphs for multiple cluster nodes as filled graphs. These graphs are only displayed with lines. However, historic data reports can have filled graphs for multiple cluster nodes.
When you view a sensor graph, you can individually hide channels. To do so, disable the check box in front of a channel name below the graph, and the according channel's line disappears. You can also click Show all or Hide all in the lower-right corner to show or hide all channels.
Graphs on a sensor's historic data tabs, as well as zoomed graphs in new windows that belong to other monitoring objects are all interactive. You can zoom in and scroll along the time axis via the corresponding buttons.
The following actions are available for graphs:
- scrolls one graph window left and scrolls one graph window right. The scrolled time depends on the graph that you select, for example, 2 days on a 2-day graph.
- scrolls left and scrolls right on the time axis. The scrolled time depends on the graph that you select.
- zooms in to and zooms out of the graph. The displayed time depends on the selected graph. For example, you can zoom into a 30-day graph so that it shows data for 6 days.
- resets the graph to the default view.
In the upper-right corner of each graph, you can find three icons .
- : Show a .png or .svg file of the graph in a new browser window. You can then save or copy the file for later use.
- : Open a larger version of the graph in a new browser window.
For each graph, you can also choose which specific channels (only for sensors) or indexes you want to see by enabling the respective check boxes or by clicking Show all or Hide all.
Warning or error limits are only shown in graphs if you select exactly one channel with a limit. Warning limits are highlighted in yellow and error limits are highlighted in red.
The Historic Data tab is only available for sensors.
For more information, see section Historic Data Reports.
The Alarms tab is not available for sensors. It is only available for probes, groups, and devices.
For more information, see section Alarms.
The System Information tab is only available for devices.
For more information, see section System Information.
The Logs tab shows past activities and events of a specific object.
For more information, see section Logs.
How does PRTG compute CPU Index, Traffic Index and Response Time Index?
Why do I get a warning message when time zones differ?
- SSL Certificate Warning
- Welcome Page
- General Layout
- Sensor States
- Review Monitoring Data
- Historic Data Reports
- Similar Sensors
- Recommended Sensors
- Object Settings
- System Information
- Working with Table Lists
- Object Selector
- Priority and Favorites
- Context Menus
- Hover Popup
- Main Menu Structure