/**
 * A self-owned OpenTelemetry pipeline pointed at Weave's Agents OTLP endpoint.
 * Spans are built through the raw OTel API rather than the Weave TS SDK's GenAI
 * helpers because those helpers cannot set historical timestamps, and this
 * collector backdates every span to when the turn actually happened. The emitter
 * can move onto the SDK if it gains start/end-time parameters.
 *
 * Auth headers for the Agents OTLP endpoint:
 *   Authorization: Basic base64("api:" + WANDB_API_KEY)
 *   project_id:    <entity>/<project>
 */
import type { Tracer } from '@opentelemetry/api';
import type { ResolvedConfig } from '../config.js';
/** The OTel pipeline as one unit; injected into the collector so tests can swap in an in-memory exporter. */
export interface TracerHandle {
    tracer: Tracer;
    /** Flush queued spans and tear down the exporter. Always await before exit. */
    shutdown: () => Promise<void>;
}
export declare function buildTracer(config: ResolvedConfig): TracerHandle;