/**
 * Prometheus Metrics Formatter
 *
 * Formats MetricsAccumulator telemetry data into Prometheus exposition format (text/plain).
 * Complies with Prometheus 0.0.4 text format specification.
 * Zero external dependencies.
 */
import type { MetricsAccumulator } from './metrics.js';
/**
 * Transforms all MetricsAccumulator state into Prometheus exposition format.
 * Returns a complete text/plain payload ready for HTTP transmission.
 */
export declare function formatPrometheusMetrics(metrics: MetricsAccumulator): string;
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