/**
 * Custom Metrics Store
 *
 * Manages dynamic OTel ObservableGauge/Counter instances registered at runtime
 * by the agent via the grafana_push_metrics tool. Provides:
 *
 *   - Validation: name regex, label consistency, cardinality limits
 *   - Persistence: gauge values survive restarts (JSON file in stateDir)
 *   - TTL eviction: optional auto-expiry for stale metrics
 *
 * All metric names are enforced to start with `openclaw_ext_` to prevent
 * collision with built-in `openclaw_lens_*` metrics.
 *
 * Data flow:
 *   Agent pushes data → store updates value maps → OTel ObservableGauge callbacks
 *   read values at export time → OTLP push → Collector → Mimir → Grafana
 */
import type { Meter, Counter as OtelCounter } from "@opentelemetry/api";
import type { OtlpJsonWriter } from "./otlp-json-writer.js";
export type MetricType = "gauge" | "counter";
export type CustomMetricDefinition = {
    name: string;
    type: MetricType;
    help: string;
    labelNames: string[];
    createdAt: number;
    updatedAt: number;
    ttlMs?: number;
};
export type CustomMetricDataPoint = {
    name: string;
    value: number;
    labels?: Record<string, string>;
    type?: MetricType;
    help?: string;
    ttlDays?: number;
    /** ISO 8601 timestamp for historical data (e.g., "2025-01-15"). Omit for real-time. */
    timestamp?: string;
};
export type CustomMetricsLimits = {
    maxMetrics?: number;
    maxLabelsPerMetric?: number;
    maxLabelValues?: number;
};
export type PushResult = {
    accepted: number;
    rejected: Array<{
        name: string;
        reason: string;
    }>;
    /** Mapping of normalized metric name → exact PromQL name (counters get _total suffix). */
    queryNames: Record<string, string>;
};
export declare function normalizeMetricName(name: string): {
    normalized: string;
    wasAutoPrepended: boolean;
};
/** Get the exact PromQL name for a metric — counters get `_total` suffix per Prometheus convention. */
export declare function getPromQLName(name: string, type: MetricType): string;
type Logger = {
    info(msg: string): void;
    warn(msg: string): void;
    error(msg: string): void;
};
export declare class CustomMetricsStore {
    private meter;
    private forceFlushFn;
    private stateDir;
    private logger;
    private limits;
    private definitions;
    /** Gauge value store: metricName → serializedLabels → value */
    private gaugeValues;
    /** OTel Counter instances for counter-type metrics */
    private counters;
    private labelValueCounts;
    private flushInterval;
    /** Set of metric names that have had ObservableGauge registered */
    private registeredGaugeNames;
    private otlpWriter;
    private pushCounter;
    constructor(meter: Meter, forceFlush: () => Promise<void>, stateDir: string, logger: Logger, limits?: CustomMetricsLimits, otlpWriter?: OtlpJsonWriter | null, pushCounter?: OtelCounter | null);
    load(): Promise<void>;
    flush(): Promise<void>;
    startPeriodicFlush(): void;
    stopPeriodicFlush(): Promise<void>;
    registerMetric(def: {
        name: string;
        type: MetricType;
        help: string;
        labelNames: string[];
        ttlMs?: number;
        createdAt?: number;
        updatedAt?: number;
    }): CustomMetricDefinition;
    pushValues(points: CustomMetricDataPoint[]): PushResult;
    /**
     * Force an immediate OTLP export so pushed data is available right away.
     */
    forceFlush(): Promise<void>;
    /**
     * Record push statistics for the `openclaw_lens_custom_metrics_pushed_total` counter.
     */
    trackPush(accepted: number, rejected: number): void;
    /**
     * Validate and normalize a data point: value check, name normalization,
     * auto-registration, label validation, cardinality check.
     * Returns { normalized, labels, def } on success, throws on failure.
     */
    private validateAndNormalize;
    private pushSingleValue;
    pushTimestampedValues(points: CustomMetricDataPoint[]): Promise<PushResult>;
    listMetrics(): CustomMetricDefinition[];
    deleteMetric(name: string): boolean;
    private trackLabelValues;
    private checkCardinality;
    private evictExpired;
}
export {};