Frontend Observability Without RUM: Session Cohorts with Stock OpenTelemetry
You can find the slice of users who are broken — one tenant, one plan, one build — using only published OpenTelemetry packages: @opentelemetry/web-common for session ids, a ~15-line span processor for your own attributes, and W3C baggage to carry the session into your backend spans. No RUM vendor, no proprietary agent, no schema to register.
