Just a quick post as may help any of you searching for this.
Scenario
Client wants to analyze most recent deadlocks that happened on a specific instance. They asked us to send the xdl files.
How do we get the deadlocks?
Depending on the version of SQL Server that you are running, there are different ways to do it.
In this post I will share how you can do it from all files that belongs to the system_health extended event session. (Not only the current file).
This works on SQL Server 2012 or higher version.
For a better overview I recommend you to read the What are SQL Server deadlocks and how to monitor them
article from SQLShack.