Add fallback userID to Capacitor, Cordova, Xamarin, and Unity

[philipphofmann]

Core or SDK?

Platform/SDK

Which part? Which one?

Capacitor, Cordova, Xamarin, and Unity

Description

Android and Cocoa use the installationId as a fallback for the userID if none is set. We should also document this behavior for Capacitor, Cordova, Xamarin, and Unity. For more context see https://github.com/getsentry/sentry-docs/pull/4201

Suggested Solution

Add the same note as in https://github.com/getsentry/sentry-docs/pull/4201 if needed.

Is it needed for

• Capacitor (@jennmueng, please answer) ~* Xamarin (@bitsandfoxes or @bruno-garcia , please answer)~ Doesn't have a native SDK under it
• Unity (@bitsandfoxes or @bruno-garcia , please answer)

[getsentry-release]

Routing to @getsentry/team-mobile for triage. ⏲️

[bruno-garcia]

Makes sense. We should not only align that the hybrid SDKs report the same underlying user-id if nothing is set. I believe the right place to set it: https://docs.sentry.io/platforms/apple/enriching-events/identify-user/

[chadwhitacre]

@bruno-garcia Should this be triaged as "Backlog"?

[chadwhitacre]

(sentry-docs vs. sentry-[sdk], slightly different label dance, sorry :-/ )

[lucas-zimerman]

@philipphofmann Is this also relevant for Flutter and React Native?

[philipphofmann]

Yes,@lucas-zimerman, but we already updated the docs for Flutter and React Native, see https://github.com/getsentry/sentry-docs/pull/4201

[kahest]

The note is present in all mentioned SDKs: https://docs.sentry.io/platforms/javascript/guides/capacitor/enriching-events/identify-user/ https://docs.sentry.io/platforms/javascript/guides/cordova/enriching-events/identify-user/ https://docs.sentry.io/platforms/unity/enriching-events/identify-user/ https://docs.sentry.io/platforms/dotnet/guides/xamarin/enriching-events/identify-user/