/**
 * AI Guard observability module.
 *
 * Provides lightweight instrumentation for production monitoring
 * without requiring external dependencies. All exports are zero-cost
 * when not configured.
 */
export type ScanMetrics = {
    scansTotal: number;
    scansFailed: number;
    findingsTotal: number;
    findingsBySeverity: Record<string, number>;
    scanDurationMsTotal: number;
    scanDurationMsMax: number;
    lastScanAt: number | null;
};
export type RuntimeMetrics = {
    requestsEvaluated: number;
    requestsBlocked: number;
    findingsEmitted: number;
    avgEvalMs: number;
    maxEvalMs: number;
    errorCount: number;
};
export declare function recordScan(durationMs: number, findingCount: number, severityCounts: Record<string, number>): void;
export declare function recordScanFailure(): void;
export declare function recordRuntimeRequest(evalMs: number, findingsEmitted: number, wasBlocked: boolean): void;
export declare function recordRuntimeError(): void;
export declare function getScanMetrics(): Readonly<ScanMetrics>;
export declare function getRuntimeMetrics(): Readonly<RuntimeMetrics>;
/**
 * Returns a Prometheus-compatible text format metrics payload.
 * Suitable for exposing at GET /metrics in a health endpoint.
 */
export declare function prometheusMetricsText(): string;
/**
 * Returns a health check payload suitable for /healthz or /readyz endpoints.
 */
export declare function healthCheck(): {
    status: "healthy" | "degraded";
    uptimeMs: number;
    metrics: {
        scan: Readonly<ScanMetrics>;
        runtime: Readonly<RuntimeMetrics>;
    };
};