How does datadog analyse the trace path to define the path group?

Question

I use datadog to monitor my application and I use the APM which sends everything to Datadog automatically.

For a specific endpoint, I have a strange behaviour:

Sometimes my traces are displayed like this: http/path_group : /films/actor_id/notes (with actor_id is different per actor)

And sometimes, they are displayed like: http/path_group : /films/?/notes

I want all traces displayed like this: http/path_group : /films/?/notes

Some information:

• language: kotlin
• java version 19
• apm: via datadog java agent