Module telemetry 

Lock-free per-core telemetry buffer.

Data Plane cores MUST NOT serve HTTP endpoints or accept Prometheus scrapes. Instead, each core writes metric samples into a lock-free ring buffer. The Control Plane (Tokio) reads these buffers and serves aggregated metrics.

This ensures observability never introduces jitter on the Data Plane.

Design

• One TelemetryRing per Data Plane core.
• Producer: the Data Plane core (single writer, no contention).
• Consumer: the Control Plane metrics exporter (periodic drain).
• Overflow policy: drop oldest samples (metrics are ephemeral).

Structs

MetricSample

A single metric sample written by a Data Plane core.

TelemetryRing

Fixed-capacity ring buffer for metric samples from a single Data Plane core.

Enums

MetricValue

Metric value types.