/**
 * HA (High Availability) Configuration Types
 *
 * Used by the distributed deployment mode (`frontmcp build -t distributed`)
 * to configure heartbeat, session takeover, and notification relay.
 */
/**
 * Configuration for HA services.
 * All values have sensible defaults — only override when tuning.
 */
export interface HaConfig {
    /** How often the pod writes a heartbeat to Redis (ms). Default: 10_000 (10s). */
    heartbeatIntervalMs: number;
    /** TTL for the heartbeat key in Redis (ms). Should be 2-3x intervalMs. Default: 30_000 (30s). */
    heartbeatTtlMs: number;
    /** Grace period after heartbeat expiry before claiming sessions (ms). Default: 5_000 (5s). */
    takeoverGracePeriodMs: number;
    /** Redis key prefix for all HA keys. Default: 'mcp:ha:'. */
    redisKeyPrefix: string;
    /** Cookie name for LB session affinity. Configurable via frontmcp.config. Default: '__frontmcp_node'. */
    affinityCookieName: string;
    /** Response header for machine ID. Configurable via frontmcp.config. Default: 'X-FrontMCP-Machine-Id'. */
    machineIdHeader: string;
}
/** Default HA configuration values. */
export declare const DEFAULT_HA_CONFIG: Readonly<HaConfig>;
/** Deployment modes set by `frontmcp build -t {target}`. */
export type DeploymentMode = 'distributed' | 'serverless' | 'standalone' | 'browser';
/** Heartbeat value stored in Redis. */
export interface HeartbeatValue {
    nodeId: string;
    startedAt: number;
    lastBeat: number;
    sessionCount: number;
}
/** Result of a session takeover attempt. */
export interface TakeoverResult {
    claimed: boolean;
    sessionId: string;
    previousNodeId?: string;
}
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