export type TelemetryTags = Record<string, string>;
export type TelemetryFields = Record<string, number | string | boolean>;
export type TelemetryLevel = 'metrics' | 'trace';
export interface TelemetryEvent {
    name: string;
    at: number;
    tags?: TelemetryTags;
    fields?: TelemetryFields;
}
export interface Telemetry {
    enabled?(level?: TelemetryLevel): boolean;
    emit(event: TelemetryEvent): void;
    counter?(name: string, value?: number, tags?: TelemetryTags): void;
    histogram?(name: string, value: number, tags?: TelemetryTags): void;
    event?(name: string, fields?: TelemetryFields, tags?: TelemetryTags): void;
    span?<Type>(name: string, fn: () => Promise<Type> | Type, tags?: TelemetryTags): Promise<Type> | Type;
}
export declare const NoopTelemetry: Telemetry;
export declare function setGlobalTelemetry(telemetry: Telemetry | undefined): void;
export declare function getGlobalTelemetry(): Telemetry | undefined;
export declare function emitTelemetryEvent(event: {
    name: string;
    at?: number;
    tags?: TelemetryTags;
    fields?: Record<string, unknown>;
    telemetry?: Telemetry;
    level?: TelemetryLevel;
}): void;
export declare function emitTelemetryCounter(options: {
    name: string;
    value?: number;
    tags?: TelemetryTags;
    telemetry?: Telemetry;
    level?: TelemetryLevel;
}): void;
export declare function emitTelemetryHistogram(options: {
    name: string;
    value: number;
    tags?: TelemetryTags;
    telemetry?: Telemetry;
    level?: TelemetryLevel;
}): void;
export declare function withTelemetrySpan<Type>(name: string, fn: () => Promise<Type> | Type, tags?: TelemetryTags, options?: {
    telemetry?: Telemetry;
    level?: TelemetryLevel;
    fieldsOnSuccess?: (value: Type) => Record<string, unknown> | undefined;
}): Promise<Type>;