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Co-authored-by: Phillip Wells <pwells@gitlab.com>

doc/operations/error_tracking.md

@@ -72,6 +72,22 @@ To enable error tracking with GitLab as the backend:
 
 1. Copy the Data Source Name (DSN) string. You need it for configuring your SDK implementation.
 
+### Configure user tracking
+
+To track the number of users impacted by an error:
+
+- In the instrumentation code, ensure each user is uniquely identified.
+
+  You can use a user ID, name, email address, or IP address to identify a user.
+
+For example, if you use [Python](https://docs.sentry.io/platforms/python/enriching-events/identify-user/), you can identify a user by email:
+
+```python
+Sentry.setUser({ email: "john.doe@example.com" });
+```
+
+For more information about user identification, see the [Sentry documentation](https://docs.sentry.io/).
+
 ## Error tracking list
 
 After your application has emitted errors to the Error Tracking API through the Sentry SDK,