import type { PluginCoreLike } from "./service.ts";
/**
 * Per-service restart tracking state.
 * Captures attempt count, timing, backoff, and final degradation flag.
 */
export interface ServiceRestartState {
    attempts: number;
    firstAttemptTime: number;
    lastAttemptTime: number;
    backoffUntil: number;
    status: "ok" | "backoff" | "permanently_degraded";
}
/**
 * Default supervisor configuration constants.
 * - maxRestartsPerWindow:   max restart attempts before permanent degradation
 * - windowMs:               sliding time window for counting attempts
 * - baseBackoffMs:          initial backoff duration (doubles per attempt)
 * - backoffFactor:          exponential multiplier applied per failed attempt
 * - maxBackoffMs:           ceiling for backoff duration
 */
export declare const SUPERVISOR_DEFAULTS: {
    readonly maxRestartsPerWindow: 3;
    readonly windowMs: 60000;
    readonly baseBackoffMs: 1000;
    readonly backoffFactor: 2;
    readonly maxBackoffMs: 30000;
};
/**
 * Micro-kernel supervisor that governs service restart discipline.
 *
 * Implements sliding-window rate limiting, exponential backoff, and
 * permanent degradation to prevent restart storms. Every public method
 * is wrapped in try/catch so the supervisor itself never causes a crash
 * (always-bootable principle).
 */
export declare class ServiceSupervisor {
    private states;
    private core;
    constructor(core: PluginCoreLike);
    /**
     * Attempt a supervised restart of the named service.
     *
     * Rules (in order):
     *  1. permanently_degraded → no-op.
     *  2. In backoff (now < backoffUntil) → skip + log.debug.
     *  3. Window expired (now - firstAttemptTime > windowMs) → reset budget.
     *  4. Under budget (attempts < maxRestartsPerWindow) → call core.restartService().
     *     - Success → reset tracking.
     *     - Failure → increment attempts, apply backoff or mark degraded.
     *  5. All errors within the supervisor are caught — never propagate.
     */
    tryRestart(name: string): Promise<void>;
    /**
     * Return the current restart tracking state for a service.
     * When no tracking record exists, returns a default 'ok' state.
     */
    getStatus(name: string): ServiceRestartState;
}
//# sourceMappingURL=service-supervisor.d.ts.map