Monitoring metrics in Admin Center

You can use the Monitor view of the Admin Center Explore tool to track used heap memory, loaded classes, active Java™ virtual machine (JVM) threads, central processing unit (CPU) usage, and other metrics depending on the resource. The Monitor view shows the metrics graphically in charts. You can customize the Monitor view by selecting the charts to show or hide.

Procedure

  • Open the Monitor view on a server or application.
    1. Go to the Explore tool.

      For Admin Center on a collective, select Explore Explore icon from the Toolbox.

    2. Select a server or application to monitor.

      For Admin Center on a collective, select one server or application instance:

      • To monitor a server, select the Servers panel and then a server.
      • To monitor an application, select the Applications panel and then an application instance. Or, to monitor an application on a server, select the Servers panel, a server, and then an application.
    3. Select Monitor icon Monitor on the vertical navigation bar.

    When first displayed, the Monitor view shows the following charts:

    Used Heap Memory
    The Used Heap Memory chart shows the heap memory used by the server in megabytes (MB) every 2 seconds. The chart also shows the used, committed, and maximum megabytes.
    Used Heap Memory chart in the Explore tool Monitor view
    Loaded Classes
    The Loaded Classes chart shows the number of classes loaded every 2 seconds. The chart also shows the number of loaded and unloaded classes, as well as the total number of classes.
    Loaded Classes chart in the Explore tool Monitor view
    Active JVM Threads
    The Active JVM Threads chart shows the number of JVM threads every 2 seconds. The chart also shows the number of live, total, and peak threads.
    Active JVM Threads chart in the Explore tool Monitor view
    CPU Usage
    The CPU Usage chart shows the percentage of CPU used every 2 seconds.
    CPU Usage chart in the Explore tool Monitor view

    Not all graphs are shown for a Node.js server. Actions are unavailable for applications on Node.js servers.

    If a server has the monitor-1.0 feature enabled, the Monitor view also has other charts, depending on the resource:

    • Active Sessions
    • Active Liberty Threads
    • Average Response Time
    • Average Wait Time
    • Request Count
    • Used Connections
    The charts available if a server enables the monitor-1.0 feature have more configuration options. For example, charts for web applications with multiple servlets, servers with active sessions, or servers with data sources display a list from which you can select resources to show in the chart.
    Average Response Time and Response Time charts with lists of resources to display in the Explore tool Monitor view
    Select Edit Edit Graphs icon, the resources to show in the chart, and then Save.
  • Show or hide charts.

    Select Edit Edit Graphs icon, the charts to show or hide, and then Save. The Monitor view shows or hides the selected charts, depending on whether the chart is shown or hidden when you make the selection.

    Your selections are saved for the resource and login user name. When the user opens the Monitor view on the resource in the future, the same chart selections are shown.

  • Show or hide chart legends.

    If a chart has multiple grid lines, you can choose whether to show or hide the chart legend depending on whether a legend is shown or hidden when you make a selection.

    For example, to view a chart legend, select Actions Actions icon for Monitor view chart for the chart and then Show legend.

    To then hide the legend, select Actions Actions icon for Monitor view chart for the chart and then Hide legend.

  • View chart data.

    In addition to viewing chart data graphically, you can view chart data in a table. Select Actions Actions icon for Monitor view chart for the chart and then View chart data.