import { MetricField, Snapshot } from './contract';
import { Options } from './config';
export declare const SUBSCRIBED_PATHS: string[];
export declare const DYNAMIC_PREFIXES: readonly ["propulsion.", "tanks.", "electrical.generators."];
export interface Diagnosis {
    code: 'ok' | 'instruments-off' | 'energy-only' | 'no-data';
    message: string;
    since_ts: number | null;
}
export declare class MetricsState {
    private opts;
    private paths;
    private gustAccum;
    lastDeltaTs: number | null;
    constructor(opts: Options);
    ingest(path: string, value: unknown, ts: number, source?: string): boolean;
    private resolveSource;
    private resolveConcept;
    private measuredAt;
    private numeric;
    private str;
    private conceptNumeric;
    snapshot(now: number, flushGust: boolean, freshnessMs?: number): Snapshot;
    private dynamicPathCount;
    dynamicPaths(now: number): Record<string, number | string>;
    dynamicPathAges(now: number): Record<string, number>;
    coreFieldAges(now: number): Partial<Record<MetricField, number>>;
    numericDynamicPaths(now: number, freshnessMs?: number): Record<string, number>;
    pathAges(now: number): Record<string, {
        last_seen_ts: number;
        active_source: string | null;
        sources: number;
    }>;
    diagnose(now: number, hasElectricalData: boolean): Diagnosis;
}