Testing Beta Sentry Metrics on self-hosted

[JeremiaAu]

Problem Statement

Is it possible to use the new sentry metrics feature using a self-hosted instance?

getsentry/sentry#64195

Solution Brainstorm

Maybe there is a feature flag that can be set in the config file like in this other issue:

getsentry/sentry#69456 (comment)

[hubertdeng123]

Please read this issue for more details: #2698

Closing this as a duplicate.