topic Re: New RUM - session and events in Real User Monitoring

New RUM - session and events

michiel_otten — Thu, 28 May 2026 19:52:39 GMT

Hi community,

I'm playing around with the new user sessions and user events. I'm finding out that I've got multiple sessions with the same dt.rum.session.id.

My question: what makes a session unique and how does Dynatrace correlate the right user events to the right session? I can't dicover this using fetch user.events and correlating it with user.sessions etcetera.

Anyone got some tips? 🙂

Re: New RUM - session and events

t_pawlak — Tue, 02 Jun 2026 13:58:58 GMT

Hi,
I tested this myself and found something interesting. A dt.rum.session.id visible in user.events is not necessarily present in user.sessions.

fetch user.events | filter dt.rum.session.id == "VHDBVRRUSPKKUSFPCCMRNUSRHTSWESHQ-0" | sort timestamp asc

returns events, while:

fetch user.sessions | filter dt.rum.session.id == "VHDBVRRUSPKKUSFPCCMRNUSRHTSWESHQ-0" | sort timestamp asc

returns no records.

This suggests that user.sessions is not simply a grouped view of user.events. There appears to be an additional aggregation/correlation layer that creates session records asynchronously and possibly applies extra conditions before a session becomes available.

So, does anyone from Dynatrace know:

what uniquely identifies a record in user.sessions?
how exactly user.events are correlated into user.sessions?
whether dt.rum.session.id is expected to be unique across user.sessions?

Re: New RUM - session and events

RAranda — Wed, 03 Jun 2026 10:39:28 GMT

Hi!
I'm Ramon, part of the team in charge of this 🙂

> what uniquely identifies a record in user.sessions?
A combination of `dt.rum.session.id` and `start_time`

> how exactly user.events are correlated into user.sessions?
For all events happening within a specific timeframe that contain the same `dt.rum.session.id`, they'll be aggregated into the session

> whether dt.rum.session.id is expected to be unique across user.sessions?
Sadly, no. It's unique in time for a specific timeframe (there can't be two sessions with the same id at the same time), but it's definitely not unique.

Feel free to drop more questions if you have any 😄