orbit-metrics

orbit-metrics publishes compact runtime snapshots into Orbit rings and reads the newest valid sample per node or logical metric key. Applications normally use it through orbitive::metrics; direct package access remains available.

Hot paths remain process-local. A periodic task captures counters or gauges into an application-defined snapshot and publishes that bounded value:

local counters
  -> OrbitMetricPublisher<T>
  -> Orbit ring
  -> OrbitMetricCollector<T>
  -> latest_by_node() / latest_by_key()

Snapshot types implement OrbitMetricSnapshot; row-like families may also implement OrbitMetricKeyedSnapshot. The caller owns encoding, aggregation, and rendering.

The crate provides:

• typed publishers and collectors;
• latest-sample lookup by node or logical key;
• optional freshness filtering;
• tolerance for malformed or overwritten old samples;
• reusable default capacities for scalar and keyed families.

It does not aggregate counters, render Prometheus output, choose a serializer, or write shared memory from application hot paths. Ring retention is a bounded observation window, not metrics durability.