/**
 * Machine ID Utility
 *
 * Single source of truth for the machine ID used across session management,
 * transport session affinity, and HA features.
 *
 * Resolution depends on deployment mode (set by `frontmcp build -t {target}`):
 *
 * **Distributed** (`FRONTMCP_DEPLOYMENT_MODE=distributed`):
 *   1. MACHINE_ID env var (explicit override)
 *   2. HOSTNAME env var (K8s pod name — auto-set by Kubernetes)
 *   3. os.hostname() (non-K8s distributed)
 *
 * **Serverless** (`FRONTMCP_DEPLOYMENT_MODE=serverless`):
 *   1. MACHINE_ID env var (explicit override)
 *   2. Random UUID (ephemeral — no file persistence)
 *
 * **Standalone** (default — `node` or `cli` build targets):
 *   1. MACHINE_ID env var (explicit override)
 *   2. File persistence at `.frontmcp/machine-id` (dev mode)
 *   3. Random UUID (production)
 */
/**
 * Get the current machine ID.
 * Returns the override (if set via `setMachineIdOverride`) or the lazily
 * computed-and-memoized value.
 */
export declare function getMachineId(): string;
/**
 * Set a process-wide machine ID override.
 * Pass `undefined` to clear the override and revert to the computed value.
 */
export declare function setMachineIdOverride(id: string | undefined): void;