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The Libresonic framework contains a convenient class (called MetricsManager) to add inner metrics that constructs in real time some performance indicators.
The use of MetricsManager is illustrated in the org.libresonic.player.filter.MetricsFilter class.
The MetricsFilter adds a metric based on the time spent by each /main.view HTTP request. This is interesting as the main.view request is invoqued when something is displayed in the main Libresonic web frame.
By default, the MetricsManager is deactivated; it does nothing. It can be activated only by adding the following line inside the livresonic.properties configuration file :
Metrics=
Once the MetricsManager as been activated this way, each metric can be inspected using a jmx console like VisualVM. Each metric is registered as a MBean as shown below.
