/**
 * SloCollector, collects SLO duration measurements from runtime events.
 *
 * Listens to the RuntimeEventBus and tracks four critical path latencies:
 * - turn_start_ms: TURN_SUBMITTED → first STREAM_DELTA
 * - cancel_ms: TURN_CANCEL → TURN_COMPLETED or TURN_ERROR
 * - reconnect_recovery_ms: TRANSPORT_RECONNECTING → TRANSPORT_CONNECTED
 * - permission_decision_ms: PERMISSION_REQUESTED → DECISION_EMITTED
 *
 * Maintains a capped rolling window of measurements per SLO and exposes
 * p95 values for PerfMonitor integration via `getMetrics()`.
 */
import type { RuntimeEventBus } from '../events/index.js';
import type { PerfMetric } from './types.js';
/** Metric key constants for each SLO measurement. */
export declare const SLO_METRICS: {
    readonly TURN_START: "slo.turn_start.p95";
    readonly CANCEL: "slo.cancel.p95";
    readonly RECONNECT_RECOVERY: "slo.reconnect_recovery.p95";
    readonly PERMISSION_DECISION: "slo.permission_decision.p95";
};
/**
 * SloCollector subscribes to RuntimeEventBus events and tracks per-SLO
 * duration samples in rolling windows. Call `getMetrics()` to retrieve
 * current p95 values for ComponentHealthMonitor extra metrics.
 *
 * @example
 * ```ts
 * const collector = new SloCollector(bus);
 * const metrics = collector.getMetrics();
 * const report = monitor.evaluate({ uiPerf, extraMetrics: Object.fromEntries(
 *   metrics.map(m => [m.name, m.value])
 * )});
 * collector.dispose();
 * ```
 */
export declare class SloCollector {
    /** Rolling window of turn_start_ms samples (TURN_SUBMITTED → first STREAM_DELTA). */
    private readonly _turnStartSamples;
    /** Rolling window of cancel_ms samples (TURN_CANCEL → TURN_COMPLETED/ERROR). */
    private readonly _cancelSamples;
    /** Rolling window of reconnect_recovery_ms samples (TRANSPORT_RECONNECTING → TRANSPORT_CONNECTED). */
    private readonly _reconnectSamples;
    /** Rolling window of permission_decision_ms samples (PERMISSION_REQUESTED → DECISION_EMITTED). */
    private readonly _permissionSamples;
    /** Pending turn start timestamps keyed by turnId. */
    private readonly _pendingTurnStart;
    /** Tracks which turnIds have received their first STREAM_DELTA. */
    private readonly _seenFirstDelta;
    /** Pending cancel timestamps keyed by turnId (set on TURN_CANCEL). */
    private readonly _pendingCancel;
    /** Pending reconnect start timestamp. Only the most recent reconnect attempt is tracked. */
    private _pendingReconnectAt;
    /** Pending permission request timestamps keyed by callId. */
    private readonly _pendingPermission;
    /** Registered unsubscribe functions. */
    private readonly _unsubs;
    /** Timer handle for the periodic stale-entry sweep. */
    private _sweepTimer;
    constructor(bus: RuntimeEventBus);
    /**
     * Attach all event listeners to the bus.
     */
    private _subscribe;
    /**
     * Sweep all pending maps and evict entries older than PENDING_TTL_MS.
     *
     * Called periodically by the sweep timer to prevent unbounded memory growth
     * when expected follow-up events (e.g. TURN_COMPLETED after TURN_CANCEL)
     * never arrive due to connection drops or unexpected process termination.
     */
    private _sweepPending;
    /**
     * Returns current p95 values for all four SLO metrics as PerfMetric entries.
     * Metrics with no samples return a value of 0.
     *
     * Intended for use with `PerfMonitor.evaluate()` via the `extraMetrics` field:
     * ```ts
     * const extras = Object.fromEntries(collector.getMetrics().map(m => [m.name, m.value]));
     * monitor.evaluate({ uiPerf, extraMetrics: extras });
     * ```
     */
    getMetrics(): PerfMetric[];
    /**
     * Returns the number of samples collected for each SLO metric.
     * Useful for diagnostics to distinguish "no data yet" from an actual 0ms result.
     */
    getSampleCounts(): Readonly<Record<string, number>>;
    /**
     * Unsubscribes all event listeners and releases resources.
     * The collector should not be used after disposal.
     */
    dispose(): void;
}
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