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Configure a dedicated datastore tracing target on the OTLP layer while preserving explicit logging filters and avoiding span overhead when OTLP is disabled. This is in preparation for adding trace spans for datastores used in Buzz ## Update — 2026-07-27 - Export HTTP requests as `INFO` server spans under `buzz_relay`, preserving request parentage for datastore spans. - Configure OTEL span filtering independently with `BUZZ_OTEL_FILTER`, so `RUST_LOG` changes cannot break trace topology. - Verify exported HTTP and datastore spans share a trace ID and have the expected parent/child relationship. Co-authored-by: Amp <amp@ampcode.com>