Distributed Direct Publish Telemetry

[patrickleet]

Summary

• Adds bounded direct publish metrics and distributed.transport.publish spans for built-in bus publishers.
• Suppresses duplicate direct publish metrics for outbox-dispatched sends while keeping outbox metrics separate.
• Updates metrics, observability, and transport docs plus exposition/OTLP coverage.

Verification

• git diff --check
• cargo test --features "http metrics" --test metrics_exposition
• cargo test --features "http otel" --test otel_export
• cargo test
• cargo test --features metrics
• cargo check --all-targets --features "metrics http otel postgres sqlite nats rabbitmq kafka"

Implements [[tasks/distributed-direct-publish-telemetry-1]]

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d5a00295-915e-4496-abff-4f0b9bd86c97

📥 Commits

Reviewing files that changed from the base of the PR and between 84a72f1 and a18a602.

📒 Files selected for processing (17)

• docs/metrics.md
• docs/observability.md
• docs/transports.md
• src/bus/bus.rs
• src/bus/in_memory_bus.rs
• src/bus/kafka_bus.rs
• src/bus/knative_bus.rs
• src/bus/mod.rs
• src/bus/nats_bus.rs
• src/bus/producer_telemetry.rs
• src/bus/rabbitmq_bus.rs
• src/bus/sql_bus_common.rs
• src/metrics.rs
• src/outbox_worker/bus_publisher.rs
• src/telemetry.rs
• tests/metrics_exposition/main.rs
• tests/otel_export/main.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch tasks--distributed-direct-publish-telemetry-1

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