This documentation is for an unreleased version of Apache Flink. We recommend you use the latest stable version.

Events #

Flink exposes a event reporting system that allows gathering and exposing events to external systems.

Reporting events #

You can access the event system from any user function that extends RichFunction by calling getRuntimeContext().getMetricGroup(). This method returns a MetricGroup object via which you can report a new single event.

Reporting single Event #

An Event represents something that happened in Flink at certain point of time, that will be reported to a TraceReporter. To report an Event you can use the MetricGroup#addEvent(EventBuilder) method.

public class MyClass {  void doSomething() {  // (...)  metricGroup.addEvent(  Event.builder(MyClass.class, "SomeEvent")  .setObservedTsMillis(observedTs) // Optional  .setAttribute("foo", "bar")); // Optional  } } 

Currently reporting Events from Python is not supported. 

Reporter #

For information on how to set up Flink’s event reporters please take a look at the event reporters documentation.

System traces #

Flink reports events listed below.

The tables below generally feature 5 columns:

• The “Scope” column describes what is that trace reported scope.

• The “Name” column describes the name of the reported trace.

• The “Attributes” column lists the names of all attributes that are reported with the given trace.

• The “Description” column provides information as to what a given attribute is reporting.

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