import type { MetricsSnapshot } from "../../../dispatch/persistence/metrics.ts";
import type { NDJSONEvent } from "./monitor-reader-types.ts";
/**
 * Parse the metrics sidecar JSON file from the state directory. Returns the
 * MetricsSnapshot (the `metrics` field from the sidecar file) or null if no
 * valid metrics file exists.
 *
 * Handles missing files, malformed JSON, and partial data gracefully (returns
 * null, never throws).
 */
export declare function readMetricsSnapshot(stateDir: string): MetricsSnapshot | null;
/**
 * Read the last N lines of the NDJSON event log (metrics-events-*.ndjson) and
 * return them as parsed NDJSONEvent objects. Returns an empty array when the
 * log file does not exist or cannot be read.
 */
export declare function readMetricsRecentEvents(stateDir: string, maxLines?: number): NDJSONEvent[];
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