Owen Lin
fa1242c83b
## Summary This PR fixes OTLP HTTP trace export in runtimes where the previous exporter setup was unreliable, especially around app-server usage. It also removes the old `codex_otel::otel_provider` compatibility shim and switches remaining call sites over to the crate-root `codex_otel::OtelProvider` export. ## What changed - Use a runtime-safe OTLP HTTP trace exporter path for Tokio runtimes. - Add an async HTTP client path for trace export when we are already inside a multi-thread Tokio runtime. - Make provider shutdown flush traces before tearing down the tracer provider. - Add loopback coverage that verifies traces are actually sent to `/v1/traces`: - outside Tokio - inside a multi-thread Tokio runtime - inside a current-thread Tokio runtime - Remove the `codex_otel::otel_provider` shim and update remaining imports. ## Why I hit cases where spans were being created correctly but never made it to the collector. The issue turned out to be in exporter/runtime behavior rather than the span plumbing itself. This PR narrows that gap and gives us regression coverage for the actual export path.
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