/**
 * HealthCheckService — connection-based system health checks
 *
 * Extends the statistics-based HealthScoreService with real connection status checks.
 * Checks gateway connections, embedding server, database, sessions, memory, and schedulers.
 */
export type CheckSeverity = 'critical' | 'warning' | 'info';
export type CheckStatus = 'pass' | 'fail' | 'warn' | 'skip';
export interface HealthCheckResult {
    name: string;
    severity: CheckSeverity;
    status: CheckStatus;
    message: string;
    detail?: string;
}
export interface SystemHealthReport {
    status: 'healthy' | 'degraded' | 'unhealthy';
    score: number;
    checks: HealthCheckResult[];
    summary: {
        critical: {
            pass: number;
            fail: number;
        };
        warning: {
            pass: number;
            fail: number;
        };
        info: {
            pass: number;
            fail: number;
        };
    };
    timestamp: number;
    metrics?: unknown;
}
export interface HealthCheckDeps {
    gateways?: Map<string, {
        isConnected(): boolean;
    }>;
    embeddingPort?: number;
    db?: {
        prepare(sql: string): {
            get(): unknown;
        };
    };
    sessionPool?: {
        getActiveSessionCount(): number;
    };
    cronScheduler?: {
        listJobs(): Array<{
            enabled: boolean;
            isRunning: boolean;
            lastRun?: Date;
            nextRun?: Date;
        }>;
    };
    heartbeat?: any;
    metricsCleanup?: {
        isRunning(): boolean;
    };
    getAgentStates?: () => Map<string, string>;
    getTokenUsage?: () => {
        used: number;
        limit: number;
        alertThreshold?: number;
    } | null;
    getActiveDelegationCount?: () => number;
    watchdogPidPath?: string;
    healthScoreService?: {
        compute(windowMs?: number): unknown;
    };
    dbPath?: string;
}
export declare class HealthCheckService {
    private deps;
    constructor(deps: HealthCheckDeps);
    addGateway(name: string, gateway: {
        isConnected(): boolean;
    }): void;
    setCronScheduler(scheduler: HealthCheckDeps['cronScheduler']): void;
    setHeartbeat(heartbeat: HealthCheckDeps['heartbeat']): void;
    setGetAgentStates(fn: HealthCheckDeps['getAgentStates']): void;
    setGetTokenUsage(fn: HealthCheckDeps['getTokenUsage']): void;
    setGetActiveDelegationCount(fn: HealthCheckDeps['getActiveDelegationCount']): void;
    check(): Promise<SystemHealthReport>;
    private checkGateways;
    private checkEmbeddingServer;
    private checkDatabase;
    private checkSessionPool;
    private checkMemory;
    private checkDiskUsage;
    private checkTokenBudget;
    private checkAgentProcesses;
    private checkDelegationChains;
    private checkWatchdog;
    private checkCronScheduler;
    private checkHeartbeat;
    private checkMetricsCleanup;
    private buildReport;
}
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