Using a Java server to server integration for a project thats setup to use event based session management are there required properties, besides distinct id, that must be sent in with every event to allow the session duration to be calculated? Can I name the event whatever I want or does it have to be "$session_start" or "$session_end"
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For a server-to-server integration in a Mixpanel project using event-based session management, here’s what you need to know: Required Properties:
- The only required property for session calculation is the distinct_id, which identifies the user. There is no mention in the documentation of any other required properties for event-based session management to calculate session duration. However, you must ensure that the events you send match the event names configured in your project’s session settings as the “Session Start” and “Session End” events.Event Naming:
- You can name your events whatever you want. The event names do not have to be $session_start or $session_end. Instead, you must configure in your Mixpanel project settings which event names should be treated as the “Session Start” and “Session End” events (for example, “Login” and “Logout”). Mixpanel will use these configured event names to compute sessions and session durations. The session computation is based on the occurrence of these configured events, not on any reserved event names or properties in the event payload itself.Summary:
- Send the distinct_id with every event.
- Use the event names you have configured as “Session Start” and “Session End” in your project settings.
- No other special properties are required for session duration calculation in event-based session management.References:
- Event-Based Sessions
- Sessions: Compute sessions based on existing event data
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If you have configured event-based session management, are sending the correct event names (as set in your project’s session settings), and are including the required distinct_id with each event, but session duration is still not being calculated, here are some possible reasons based on the knowledge sources: 1. Session Start and End Events Not Properly Matched: For event-based sessions, Mixpanel requires that the events you send exactly match the event names configured as “Session Start” and “Session End” in your project settings. If there is a mismatch in naming (e.g., case sensitivity, typos), sessions may not be computed correctly Event-Based Sessions.2. Sessions Reset at Midnight: Sessions are reset every 24 hours at midnight (according to your project timezone). If a session crosses midnight, the session duration may not be calculated for that session, as the “Session Start” and “Session End” events may not be associated across the day boundary Event-Based Sessions.3. Missing or Out-of-Order Events: If a “Session End” event is received without a preceding “Session Start” event (or vice versa), Mixpanel will not calculate a session duration for that session. Both events must be present and in the correct order for the duration to be computed Event-Based Sessions.4. Excluded Events: If your “Session Start” or “Session End” events are excluded from session calculations in your project settings, they will not be used to compute sessions Excluded Events.5. Event Timestamps: If events are sent with incorrect or missing timestamps, Mixpanel may not be able to accurately compute session durations.If you have checked all of the above and session durations are still not being calculated, the knowledge sources do not provide further troubleshooting steps. In that case, you may need to contact Mixpanel support for more detailed assistance.
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To ensure event timestamps are correct when sending events to Mixpanel: - Send timestamps in Coordinated Universal Time (UTC). Mixpanel expects event timestamps to be in UTC. If you overwrite the default timestamp, import old data, or set a property that is in date format, always send the timestamp in UTC. - Use the correct property: The timestamp should be included as the time property in the event’s properties object. This should be a Unix timestamp (seconds since midnight, January 1, 1970 - UTC) How Deduplication Works. - Format for date properties: For date-type properties (not the event timestamp itself), Mixpanel recommends using an ISO-formatted date string (YYYY-MM-DDTHH:mm:ss) Manage Timezones for Projects.Example for including a timestamp in JavaScript:Example for including a date property:Key points: - Always use UTC for event timestamps. - Use the time property for the event timestamp (as a Unix timestamp in seconds). - For date properties, use ISO-formatted strings.This ensures Mixpanel can accurately compute session durations and other time-based analytics Manage Timezones for Projects.
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When using the Mixpanel Java server-to-server integration, you set the event timestamp by including the time property in the event’s properties object. The value should be a Unix timestamp in milliseconds (not seconds) since the UTC epoch.Here’s an example from the documentation showing how to structure an event with a timestamp: LBKS{ "event": "Played Song", "properties": { "token": "YOUR_PROJECT_TOKEN", "time": 1601412131000, // Unix timestamp in milliseconds (UTC) "distinct_id": "user@[example.com](http://example.com)", // ... other properties } }LBKSIf you do not include the time property, Mixpanel will use the time the event arrives at the server. For accurate session calculations, especially for historical or out-of-order events, you should always set the time property explicitly Anatomy of an Event.Key points:
- The time property must be a Unix timestamp in milliseconds (UTC).
- Add time to the properties object when building your event payload.The Java SDK’s MessageBuilder.event() method accepts a JSONObject for properties, so you can add the time property as shown above before sending the event Sending Events (Java).If you need to generate the current UTC time in milliseconds in Java, you can use: LBKSlong timestamp = System.currentTimeMillis(); props.put("time", timestamp);LBKSThis will ensure your events have the correct timestamp for Mixpanel session calculations.
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