/**
 * Telemetry — metryki, tracing, health.
 *
 * Kształt zbliżony do OpenTelemetry, ale framework-agnostic.
 * Adaptery: @echelon-framework/telemetry-otel, @echelon-framework/telemetry-mock.
 */
import type { CorrelationId } from '../identity/index.js';
export type MetricKind = 'counter' | 'gauge' | 'histogram';
export interface Metric {
    readonly name: string;
    readonly kind: MetricKind;
    readonly value: number;
    readonly attributes?: Readonly<Record<string, string | number | boolean>>;
    readonly at: number;
}
export interface Span {
    readonly name: string;
    readonly correlationId: CorrelationId;
    end(attributes?: Record<string, unknown>): void;
    fail(error: unknown): void;
}
export interface TelemetryService {
    metric(metric: Metric): void;
    startSpan(name: string, correlationId: CorrelationId): Span;
}
export declare const TELEMETRY: import("../index.js").EchelonToken<TelemetryService>;
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