4.3 Detection of an excess beyond the threshold by threshold value monitoring

Threshold value monitoring detects an overage of the threshold set for the performance of a monitored service. Threshold value monitoring monitors each monitoring item.

If an SLO has been defined, you can detect an overage of the SLO value by specifying the SLO value as the threshold. If no SLOs have been defined, you can detect an overage of some criterion assumed for service performance by specifying for the threshold a value representing the criterion.

The following shows an example in which an overage of a threshold is detected by threshold value monitoring.

Figure 4‒3: Example in which an overage of a threshold is detected

This example monitors average response time. As time passed, the service performance value increased until an overage of the threshold was detected.

When an overage of a threshold is detected, an error is displayed in the window.

The following shows an example in which an error is displayed in the window.

Figure 4‒4: Example in which an error is displayed in the window (threshold value monitoring)

The information displayed in the window includes an error icon, the detection date and time, the name of the service group subject to the error, and the service name. If service performance keeps exceeding the threshold, an error is displayed only the first time overage of the threshold is detected. You can view the service performance leading up to and following the displayed error in a graph.

The following shows an example of a graph that is displayed.

Figure 4‒5: Example of a graph that is displayed (threshold value monitoring)

In the graph, an error icon indicates the time the threshold was exceeded and a colored bar indicates the time period during which the event resulting in the overage of the threshold is assumed to have occurred.

To run threshold value monitoring, you must specify the following item in the Settings window:

Threshold

Specifies the reference threshold that is to be used to determine the status of the monitored service.

For details about monitor items, see 4.2 Monitoring methods and monitor items of SLM.

For details about threshold value monitoring, see the description about threshold value monitoring in the manual JP1/Service Level Management.

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