import type { CryptoOperations, RequestContext, SignatureOperations } from '../interfaces/core.js';
import type { DecryptionRequest, EncryptionRequest, EncryptionResult, SignatureRequest, SignatureResult, VerificationRequest } from '../types.js';
import { CryptoOperationsDecorator, SignatureOperationsDecorator } from './base.js';
/**
 * Metrics collector interface
 * Allows integration with any metrics backend (Prometheus, DataDog, New Relic, etc.)
 */
export type MetricsCollector = {
    /**
     * Record operation latency in milliseconds
     */
    recordLatency(operation: string, durationMs: number): void;
    /**
     * Increment operation counter
     */
    incrementCounter(operation: string, labels?: Record<string, string>): void;
};
/**
 * Metrics decorator for CryptoOperations
 * Records latency and error rates for encryption/decryption operations
 * Integrates with observability platforms (Prometheus, DataDog, etc.)
 */
export declare class InstrumentedCryptoOperations extends CryptoOperationsDecorator {
    private readonly metrics;
    constructor(wrapped: CryptoOperations, metrics: MetricsCollector);
    encrypt(request: EncryptionRequest & RequestContext): Promise<EncryptionResult>;
    decrypt(request: DecryptionRequest & RequestContext): Promise<Uint8Array>;
}
/**
 * Metrics decorator for SignatureOperations
 * Records latency and error rates for signing/verification operations
 */
export declare class InstrumentedSignatureOperations extends SignatureOperationsDecorator {
    private readonly metrics;
    constructor(wrapped: SignatureOperations, metrics: MetricsCollector);
    sign(request: SignatureRequest & RequestContext): Promise<SignatureResult>;
    verify(request: VerificationRequest & RequestContext): Promise<boolean>;
}
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