temporalio/temporal · error

unsupported span exporter type: %T

Error message

unsupported span exporter type: %T

What it means

Error "unsupported span exporter type: %T" thrown in temporalio/temporal.

Source

Thrown at common/telemetry/config.go:229

// SpanExporters builds the set of OTEL SpanExporter objects defined by the YAML
// unmarshalled into this ExportConfig object. The returned SpanExporters have
// not been started.
func (ec *exportConfig) SpanExporters() (map[SpanExporterType]otelsdktrace.SpanExporter, error) {
	out := make(map[SpanExporterType]otelsdktrace.SpanExporter, len(ec.Exporters))
	for _, expcfg := range ec.Exporters {
		if !strings.HasPrefix(expcfg.Kind.Signal, "trace") {
			continue
		}
		switch spec := expcfg.Spec.(type) {
		case *otlpGrpcSpanExporter:
			spanexp, err := ec.buildOtlpGrpcSpanExporter(spec)
			if err != nil {
				return nil, err
			}
			out[SpanExporterType(expcfg.Kind.Model)] = spanexp
		default:
			return nil, fmt.Errorf("unsupported span exporter type: %T", spec)
		}
	}
	return out, nil
}

func (ec *exportConfig) MetricExporters() ([]metric.Exporter, error) {
	out := make([]metric.Exporter, 0, len(ec.Exporters))
	for _, expcfg := range ec.Exporters {
		if !strings.HasPrefix(expcfg.Kind.Signal, "metric") {
			continue
		}
		switch spec := expcfg.Spec.(type) {
		case *otlpGrpcMetricExporter:
			metricexp, err := ec.buildOtlpGrpcMetricExporter(spec)
			if err != nil {
				return nil, err
			}
			out = append(out, metricexp)

View on GitHub (pinned to bde624efd1)

When it happens

Trigger: Thrown at common/telemetry/config.go:229 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of temporalio/temporal@bde624efd1 (2026-09-01). Data as JSON: /api/errors/6ff25650d15d1fa1. Report an issue: GitHub.