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Signposts are a special part of the Unified Logging and Activity Tracing system. They allow you to mark point-in-time events that occur in your code, or track the duration of operations by specifying the begin and end for an activity. These can be visualized in Instruments to get a rich, high level view of how these operations are performing, how often they are occurring, and how long they are taking. In this episode we will see how to add signposts to an app and how to view these signposts in Instruments.