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The Flight Recorder collects information about three types of events:
Duration event; A duration event is something that happens during a period of time. Duration events are logged when completed. The user can put a threshold on the Duration Events, so only events with duration greater than X is recorded. This is not possible for the other events.
Instant event; An instant event is instantaneous and will be logged each time one occurs.
Sample event (also called "requestable event"); A sample event is one that is recorded at a regular interval to provide a sample of system activity; for example, the CPU load. Users can use the JFR to configure how often sampling occurs.