Log event notification listener in Optimizely Feature Experimentation

The log event notification listener is similar to the track notification listener but provides more granularity. You can use it to inspect and audit what data was sent to Optimizely in a given event batch, and when the batch was sent.

Parameters

The following table shows the information provided to the log event listener when it is triggered:

Parameter	Type	Description
log event	Log Event	A `LogEvent` object containing a batch of conversion and decision events. Created by the `EventFactory` whenever the event processor produces a batch. For information, see the following table.

Log Event

The LogEvent object represents the batch of decision and conversion events passed to the event dispatcher.

Object	Type	Description
http verb Required (non null)	String	The HTTP verb to use when dispatching the log event. Can be `GET` or `POST`.
url Required (non null)	String	URL to dispatch log event to.
params Required (non null)	Dict	The event batch. Contains all events in the batch, including a list of visitors and their associated `UserEvent` objects.
headers	Dict	Request headers.

Examples

For code examples, see the following SDK documentation on notification listeners:

Android SDK
C# SDK
Flutter SDK
Go SDK
Java SDK
JavaScript SDK – SDK versions 6.0.0 and later.
JavaScript (Browser) SDK – SDK versions 5.3.5 and earlier.
JavaScript (Node) SDK – SDK versions 5.3.5 and earlier.
PHP SDK
React SDK
React Native SDK
Ruby SDK
Python SDK
Swift SDK