core.tracing — distributed tracing (OpenTelemetry-compatible)
Identifiers, contexts, spans, samplers, processors, exporters, and W3C Trace Context propagation — the substrate every Verum framework instruments against.
core.metrics — Prometheus- and OTel-compatible instrumentation
Lock-free Counter / UpDownCounter / Gauge / Histogram primitives, a bounded-cardinality registry, a Prometheus text-format (0.0.4) encoder, a pluggable exporter protocol, and Dropwizard-style EWMA meters.