User and session management

Latest Dynatrace
How-to guide
Published Dec 24, 2025

Dynatrace allows you to identify users across sessions and devices, manage session lifecycle, and attach properties that apply to all events in a session.

Identify users

Use identifyUser() to tag the current session with a user identifier. This enables you to track individual users across different sessions, browsers, and devices.

Basic usage

// After user logs in
Dynatrace.identifyUser("user@example.com")

// Or use an internal user ID
Dynatrace.identifyUser("user-12345")

Remove user identification

To remove the user tag (for example, on logout), pass nil or an empty string:

func logout() {
    // Clear user identification
    Dynatrace.identifyUser(nil)
}

Important considerations

Not persisted—the user tag is not stored. You must call identifyUser() for every new session.
Automatic re-tagging—when a session splits due to idle or duration timeout, the subsequent session is automatically re-tagged with the same user identifier.
Privacy—consider privacy regulations when choosing what identifier to use. Hashed or anonymized IDs may be preferable.

When the user closes the app or when privacy settings change, sessions are not automatically re-tagged. You must call identifyUser() again after the new session starts.

Session properties

Session properties are key-value pairs that apply to all events in the current session. Use them to add context that characterizes the user's session.

Event and session properties must be configured before they can be used. Incoming event and session properties that are not configured are dropped during event ingest.

Send session properties

Dynatrace.sendSessionPropertyEvent(
    DTXSessionPropertyEventData()
        .addSessionProperty("session_properties.product_tier", value: "premium")
        .addSessionProperty("session_properties.loyalty_status", value: "gold")
        .addSessionProperty("session_properties.onboarding_complete", value: true)
)

Property naming rules

Keys must be prefixed with session_properties..
Field names must contain only alphanumeric characters, underscores, and dots.
Each dot must be followed by an alphabetic character.
Each underscore must be followed by an alphabetic character or number.
Values must be primitive types (String, Int, Double, Bool).

Valid examples:

session_properties.product_tier
session_properties.loyalty_status
session_properties.onboarding_complete

Session properties require server-side configuration in Dynatrace. Properties that are not configured are dropped during ingest.

Limits

Naming:
- Field name maximum length: 100 characters (including the session_properties. prefix).
- Allowed characters in field name: A–Z, a–z, 0–9, underscore _, and dot ..
Counts—a maximum of 50 session properties can be configured.
Values—for session properties of data type string, the length is limited to 5,000 characters.

Update session properties

You can send session properties multiple times during a session. However, if you send the same property multiple times, session aggregation keeps only one value (first or last, depending on configuration).

// Initial properties
Dynatrace.sendSessionPropertyEvent(
    DTXSessionPropertyEventData()
        .addSessionProperty("session_properties.cart_value", value: 0)
)

// Update after user adds items
Dynatrace.sendSessionPropertyEvent(
    DTXSessionPropertyEventData()
        .addSessionProperty("session_properties.cart_value", value: 149.99)
)

End session

Use endVisit() to manually close the current session and start a new one. All open actions are closed and sent to the server.

func logout() {
    // Clear user identification
    Dynatrace.identifyUser(nil)

    // End the current session
    Dynatrace.endVisit()
}

Sessions also end automatically based on idle timeout and maximum session duration configured in your Dynatrace environment.