I2.8 — Observability for Wolverine (metrics, tracing, health checks)

[nickna]

Phase 2 · Size M · Risk: med

Scope

• Metrics/tracing (OpenTelemetry) + health checks for Wolverine.
• Replace RabbitMQHealthCheck and MassTransit metrics; update dashboards/alerts.

Acceptance criteria

• Wolverine queue depth/failures/retries visible; health endpoint reflects the new bus.

Dependencies

I2.2 (finalize alongside I2.7).

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Part of #909 — Messaging Migration epic.