Unable to populate built-in appVersion field in RUM User Sessions using dtrum.sendSessionProperties()

[Mohsen]

Hi everyone,

I'm using the Dynatrace Serverless Agent JavaScript in a React web application and I'm trying to populate the built-in appVersion field that appears in User Sessions Query.

I currently send session properties using the following code:

dtrum.sendSessionProperties(undefined, undefined, {

  region,

  env: environment,

  appversion: appVersion ?? ''

});

I can confirm that appVersion has a value on the client side, and the call is being executed.

However, when I query user sessions, the built-in appVersion field is always null.

I have not created a custom User Session Property or User Action Property for appversion because my understanding is that appVersion is already a built-in Dynatrace session attribute, and I was hoping to populate that field directly.

Questions:

1. Is it possible to set the built-in appVersion session field using dtrum.sendSessionProperties()?
2. Does Dynatrace map a custom property named appversion (or appVersion) to the built-in appVersion field?
3. If not, what is the recommended way to populate the built-in appVersion field for a React web application using the Serverless Agent JavaScript?
4. Do I need to create a custom session property and query that instead of relying on the built-in appVersion field?

[Julius_Loman]

@Mohsen 

1. Is it possible to set the built-in appVersion session field using dtrum.sendSessionProperties()? - No, only session properties can be sent using that method.
2. Does Dynatrace map a custom property named appversion (or appVersion) to the built-in appVersion field? No, session or action properties are custom properties you define in your application definition and values can be sent to them.
3. If not, what is the recommended way to populate the built-in appVersion field for a React web application using the Serverless Agent JavaScript? appVersion is afaik used only for mobile and custom applications and this field is populated by the Mobile SDK or OpenKit. See https://docs.dynatrace.com/docs/shortlink/api-usql-structure 
4. Do I need to create a custom session property and query that instead of relying on the built-in appVersion field? Yes, that seems to be the only option as of today. Even the example page includes this https://docs.dynatrace.com/docs/shortlink/user-session-properties#examples-of-action-and-session-pro...