Sentry.metrics.count doesn't emit user attributes

[KazWolfe]

Issue Description

Per the Metrics documentation, user information is supposed to be added to any metrics published. At present with version 6.3.0, however, this does not appear to be the case.

Reproduction Steps

1. Call Sentry.set_user in the base ApplicationController.
2. Attempt to log metrics from a controller that inherits this.

Specific code that triggers this bug:

Sentry.metrics.count(
  "my.metric.here",
  value: 1,
  attributes: {
    "some.metric.path": "some_value"
  }

A logger.warn("SENTRY USER INFO:", Sentry.get_current_scope.user) statement immediately prior does print user information, so it's definitely there within the scope.

Expected Behavior

The final metrics attributes contains user.id and user.email.

Actual Behavior

Only the metrics passed in via attributes make it to the final metrics uploaded to the Sentry dashboard.

Ruby Version

4.0.1

SDK Version

6.3.0

Integration and Its Version

Rails 8.1.2

Sentry Config

https://github.com/KazWolfe/XIVAuth/blob/f7e510ef5e803cf6af6c709a7be77adab6899927/config/initializers/sentry.rb

[linear]

RUBY-141

[sl0thentr0py]

I've created a reproduction for this issue: getsentry/repro#1

You can run it by cloning the repo and following the instructions in the README:

git clone https://github.com/getsentry/repro.git
cd repro/sentry-ruby/2842
bundle install
export SENTRY_DSN="your-dsn-here"
bundle exec rails server
# Visit http://localhost:3000/test

The reproduction demonstrates that user info set via Sentry.set_user is present in the scope but not automatically included in metrics emitted via Sentry.metrics.count.