[raphael-bynome]

Summary

The metrics table in the OpenTelemetry page only lists the two HTTP instruments. backend/open_webui/utils/telemetry/metrics.py (v0.13.0) also registers three observable gauges: webui.users.total, webui.users.active and webui.users.active.today (unit users). This adds them to the table, with what each one counts: "active" means a last_active_at within the last 180 s, and "today" starts at midnight UTC (now - now % 86400), which matters when building dashboards in another timezone.

Related issue or discussion

None.

Checklist

• I have reviewed the relevant documentation and matched the existing style.
• This PR meets Open WebUI's contribution standards: it is accurate, relevant to users, narrowly scoped, maintainable, and not promotional content, advertising, lead generation, SEO placement, or a request to list a product, service, provider, integration, gateway, tool, or company primarily for visibility.
• I understand that PRs that do not meet these standards may be closed without review and will not be merged. Repeated, low-quality, off-topic, promotional, or intentionally misleading submissions may result in the contributor being blocked from future participation in Open WebUI repositories.

Notes for reviewers

Checked against backend/open_webui/utils/telemetry/metrics.py on main at 0.13.0 (gauge registration and the _count_active_users / _count_users_active_today queries).

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