The Event Timing API
Appium comes with the ability to retrieve timing information about startup
information and command length. This is an advanced feature that is controlled
by the use of the
appium:eventTimings capability (set it to
true to log event
With this capability turned on, the
GET /session/:id response (i.e., the
driver.getSessionDetails() or similar, depending on client) will
be decorated with an
events property. This is the structure of that
In other words, the
events property has 2 kinds of properties of its own:
- Properties which are the names of event types
Properties which are names of event types correspond to an array of timestamps when that event happened. It's an array because events might happen multiple times in the course of a session. Examples of event types include:
(Individual drivers will define their own event types, so we do not have an exhaustive list to share here. It's best to actually get one of these responses from a real session to inspect the possible event types.)
commands property is an array of objects. Each object has the name of the
Appium-internal command (for example
click), as well as the time the command
started processing and the time it finished processing.
With this data, you can calculate the time between events, or a strict timeline of events, or statistical information about average length of a certain type of command, and so on.
You can only receive data about events that have happened when you make the
/session/:id, so the best time to get data about an entire session is
right before quitting it.
The Appium team maintains an event timings parser tool that can be used to generate various kinds of reports from event timings output: appium/appium-event-parser.
Add a custom event
The links to the commands in the following paragraph do not yet work since these docs are under construction.
You can add custom events that will show up in the event timings data. You can send a custom event name to the Appium server using the Log Event API, and the server will store the timestamp. The Get Events command can be used to retrieve named events' timestamps later on.