I'm considering writing a tracing subscriber that dumps events, span starts/stops, and span field updates to a terse local log file format. This is a superset of what OpenTelemetry offers. (OpenTelemetry only has the concept of a completed span, which I find really unfortunate.) So I'd write a tool that takes that and pushes it to OpenTelemetry (otelcol-contrib plugin maybe) and more local-focused tools like `logcat`.