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 summary graphs for different time spans of the probe or group.
- Devices: The tab shows device details, a geographical map, and summary graphs for different time spans, gauges, as well as a table list of all sensors on this device, and a table list with recommended sensors.
- Sensors: The tab shows sensor details, status, gauges, graphs for different time spans, a table with all channels, as well as similar sensors.
You can turn off the sensor recommendation and disable the table list in System Administration—Monitoring.
Assign 4-star (****) or 5-star (*****) priorities to sensors to display their gauges on your devices' Overview tabs. 5-star sensors are represented by larger gauges (upper row in the screenshot) rather than 4-star sensors (lower row in the screenshot).
- 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 priority. The primary channel is displayed with the large gauge.
- Channels that display binary values such as on/off or successful/failing because of their lookup configuration are visualized as switches not gauges. Switches only show red or green 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 available for xFlow and Packet Sniffer sensors only. Toplist graphs are displayed directly on the sensor's Overview tab.
For more information, see section Toplists.
Select one of the tabs Live Data (available for sensors only), 2 days, 30 days, or 365 days to display an object's monitoring data live (sensors only), 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 days mentioned here are the default settings. You can change the shown days of the different graphs under System Administration—User Interface.
Graphs label minimum and maximum values of a sensor's primary channel and 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 response time, CPU load, and 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 ever recorded.
The three index graphs show trends in your network. If these values increase over a certain time span, then CPU load, bandwidth usage, or response time have worsened 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:
- Alarms: 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. You cannot hide it.
- Response Time Index: Indicates the request times in your network.
- CPU Load Index: Indicates the CPU load in your network.
- Traffic Index: Indicates the bandwidth usage in your network.
For more details about the index graphs, see the Knowledge Base: How does PRTG compute CPU Index, Traffic Index and Response Time Index?
You can hide all channels individually except the "Alarms" channel. To do this, remove the check mark symbol in front of a channel name below the graph, and the corresponding channel's line disappears. You can also Show all or Hide all channels via the buttons in the lower-right corner. The graph view is reset immediately.
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 of one specific cluster node only. Use the Show data of option above the graph.
Graphs for multiple cluster nodes are never displayed as filled graphs, they are displayed with lines only. However, historic data reports can have filled graphs for multiple cluster nodes.
When you view a sensor graph, you can hide single channels individually. To do so, remove the check mark symbol in front of a channel name below the graph, and the according channel's line disappears. You can also Show all or Hide all channels via the buttons in the lower-right corner.
The graphs shown on a sensor's historic data tabs, as well as zoomed graphs in new windows (see below) that belong to other monitoring objects are all interactive. You can zoom in and scroll along the time axis with the corresponding buttons.
The following actions are available for graphs:
- scrolls one graph window left and one graph window right. The scrolled time depends on the graph that you select, for example, 2 days on a 2 days graph.
- scrolls left and right on the time axis. The scrolled time depends on the graph that you select.
- zooms into and out of the graph. The displayed time depends on the graph selected. For example, you can zoom into a 30 days graph so that it shows data for 6 days.
- resets the graph to the default view.
In the upper-right corner of each graph, three small icons are located .
- Download the graph (PNG or SVG): Shows a .png or .svg file of the graph in a new browser window. You can then save or copy it for later use.
- Zoom graph in new window: Opens 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 that you want to see via the corresponding check boxes or the Show all and Hide all buttons.
Warning or error limits are only shown in graphs (highlighted in yellow or red) if you select exactly one channel with a limit.
The Historic Data tab is available for sensors only.
For more information, see section Historic Data Reports.
With sensor lists, you can select which kind of sensors you want to see. Many different sensor list views are available, such as a list of favorite sensors and top 10 lists, lists filtered by sensor status, value, availability, tag or type, and sensor cross reference, for example.
You can access sensor lists via the main menu bar. Click the Sensors entry to show a table list of all sensors. In the table list displayed here, you can re-arrange the items via the column's header items (see section Working with Table Lists). Hover over it to show other menu options.
For detailed information about the available options, see section Main Menu Structure (Sensors).
The Alarms tab is not available for sensors, but for probes, groups, and devices only.
For more information, see section Alarms.
The System Information tab is available for devices only.
For more information, see section System Information.
The Logs tab shows past activities and events regarding the 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
Other Ajax Web Interface Sections