zopu-code/repos/effect/.changeset/fix-otel-logger-severity-number.md

@effect/opentelemetry

@effect/opentelemetry
patch

Logger: emit OTel-spec SeverityNumber (1-24) instead of Effect's internal log-level ordinal.

OtelLogger.make previously passed LogLevel.getOrdinal(level) (e.g. Info=20000, Error=40000) as severityNumber, which falls outside the OpenTelemetry logs data model spec range (1-24). Backends that validate the field (Honeycomb, Datadog, etc.) bucket such values as UNSPECIFIED.

The mapping now follows the spec:

Effect LogLevel	OTel SeverityNumber
Trace	TRACE (1)
Debug	DEBUG (5)
Info	INFO (9)
Warn	WARN (13)
Error	ERROR (17)
Fatal	FATAL (21)

Also exports the helper logLevelToSeverityNumber for downstream use.