export declare function monotonicNow(): number;
export type EnforcerRunOutcome = 'ok' | 'error';
export type EnforcerFailureReason = 'adapter-error' | 'timeout' | 'no-adapter';
export interface EnforcerMetricDescriptor {
    readonly name: string;
    readonly kind: 'histogram' | 'counter';
    readonly unit: string;
    readonly description: string;
}
export declare const ENFORCER_METRICS: {
    readonly duration: {
        readonly name: "enforcer.run.duration";
        readonly kind: "histogram";
        readonly unit: "ms";
        readonly description: "Wall-clock duration of a single enforcer adapter run.";
    };
    readonly failures: {
        readonly name: "enforcer.run.failures";
        readonly kind: "counter";
        readonly unit: "{failure}";
        readonly description: "Enforcer runs that produced no usable result (error, timeout or missing adapter).";
    };
    readonly timeouts: {
        readonly name: "enforcer.run.timeouts";
        readonly kind: "counter";
        readonly unit: "{timeout}";
        readonly description: "Enforcer runs that exceeded their time budget.";
    };
    readonly violations: {
        readonly name: "enforcer.run.violations";
        readonly kind: "counter";
        readonly unit: "{violation}";
        readonly description: "Number of violations returned by an enforcer run.";
    };
};
export interface EnforcerRunAttributes {
    readonly tool: string;
    readonly runtime?: string;
}
export interface EnforcerDurationSample extends EnforcerRunAttributes {
    readonly durationMs: number;
    readonly outcome: EnforcerRunOutcome;
}
export interface EnforcerFailureSample extends EnforcerRunAttributes {
    readonly reason: EnforcerFailureReason;
}
export type EnforcerTimeoutSample = EnforcerRunAttributes;
export interface EnforcerViolationSample extends EnforcerRunAttributes {
    readonly count: number;
}
export interface IEnforcerMetrics {
    recordDuration(sample: EnforcerDurationSample): void;
    recordFailure(sample: EnforcerFailureSample): void;
    recordTimeout(sample: EnforcerTimeoutSample): void;
    recordViolations(sample: EnforcerViolationSample): void;
}
export declare const NoopEnforcerMetrics: IEnforcerMetrics;
export declare class RecordingEnforcerMetrics implements IEnforcerMetrics {
    readonly durations: EnforcerDurationSample[];
    readonly failures: EnforcerFailureSample[];
    readonly timeouts: EnforcerTimeoutSample[];
    readonly violations: EnforcerViolationSample[];
    recordDuration(sample: EnforcerDurationSample): void;
    recordFailure(sample: EnforcerFailureSample): void;
    recordTimeout(sample: EnforcerTimeoutSample): void;
    recordViolations(sample: EnforcerViolationSample): void;
    get failureCount(): number;
    get timeoutCount(): number;
    get totalViolations(): number;
    reset(): void;
}
export declare function isTimeoutError(err: unknown): boolean;