import { Counter, Gauge, Histogram, Registry } from 'prom-client';
/**
 * Prometheus metric registry for the relayer
 */
export declare const relayerMetricsRegistry: Registry;
/**
 * Total number of messages processed by the relayer
 */
export declare const relayerMessagesTotal: Counter<"destination_chain" | "origin_chain" | "status">;
/**
 * Total number of retry attempts for failed messages
 */
export declare const relayerRetriesTotal: Counter<"destination_chain" | "origin_chain">;
/**
 * Current size of the message backlog
 */
export declare const relayerBacklogSize: Gauge<string>;
/**
 * Time taken to relay a message (in seconds)
 */
export declare const relayerRelayDuration: Histogram<"destination_chain" | "origin_chain">;
/**
 * Number of messages skipped due to whitelist filtering
 */
export declare const relayerMessagesSkipped: Counter<"destination_chain" | "origin_chain">;
/**
 * Number of messages already delivered (no relay needed)
 */
export declare const relayerMessagesAlreadyDelivered: Counter<"destination_chain" | "origin_chain">;
/**
 * Helper class for recording relayer metrics
 */
export declare class RelayerMetrics {
    recordMessageSuccess(originChain: string, destinationChain: string): void;
    recordMessageFailure(originChain: string, destinationChain: string): void;
    recordRetry(originChain: string, destinationChain: string): void;
    updateBacklogSize(size: number): void;
    recordRelayDuration(originChain: string, destinationChain: string, durationSeconds: number): void;
    recordMessageSkipped(originChain: string, destinationChain: string): void;
    recordMessageAlreadyDelivered(originChain: string, destinationChain: string): void;
    /**
     * Start a timer for measuring relay duration
     * Returns a function that should be called when the relay completes
     */
    startRelayTimer(originChain: string, destinationChain: string): () => number;
}
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