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To investigate issues with availability and uptime of the JVM, select jvm Uptime as the Subsystem. Figure 1 will then appear.
The contents of the uptime dashboard are as follows:
Sometimes, you might have to periodically determine the percentage of time for which certain critical Java applications have been up and running, so that you know whether/not the application has been able to maintain the desired uptime levels. To run such uptime checks, summary graphs of the uptime measures are useful. To view summary graphs in the History tab page, click on the icon at the right, top corner of the History tab page. Figure 2 will then appear.
Similarly, you can analyze uptime trends by viewing trend graphs in the History tab page. For this, click on the icon at the right, top corner of the tab page. Figure 2 will then appear.
Figure 3 : Trend graphs displayed in the JVM Uptime Dashboard
To change the timeline of a particular graph, click on the graph to enlarge it, and then alter its timeline. The Graph type can be viewed in the enlarged mode. By default, the graph Duration is Hourly, indicating that trend graphs plot hourly trend values by default. To ensure that these graphs plot the daily/monthly trend values instead, select the relevant option from the Duration list. Similarly, as already mentioned, trend graphs plot only the minimum and maximum values registered by a measure during the specified timeline. Accordingly, the Graph type is set to Min/Max by default in the enlarged mode. If you want the trend graph to plot the average trend values instead, set the Graph type to Avg. On the other hand, to configure the trend graph to plot the sum of trends set the Graph type to Sum.
In case of descriptor-based tests, the Summary and Trend graphs displayed in the History tab page typically plot the values for a single descriptor alone. To view the graph for another descriptor, pick a descriptor from the drop-down list made available above the corresponding summary/trend graph.