/** Consecutive failed starts that arm the automatic rollback. */
export declare const CRASH_LOOP_FAILED_START_THRESHOLD = 3;
export interface CrashLoopRollbackInput {
    /**
     * Consecutive PREVIOUS start attempts that never reached a fully-started
     * daemon (this boot excluded, it has not failed yet).
     */
    readonly failedStarts: number;
    /** When an automatic rollback last fired, if no fully-started boot cleared it since. */
    readonly autoRollbackAt: number | undefined;
    /** Override for tests; defaults to CRASH_LOOP_FAILED_START_THRESHOLD. */
    readonly threshold?: number | undefined;
}
export type CrashLoopRollbackVerdict = {
    readonly rollback: false;
    readonly reason: 'healthy' | 'already-rolled-back';
} | {
    readonly rollback: true;
    readonly failedStarts: number;
};
/**
 * Whether this boot should restore the kept previous version before it tries
 * to start. Reached at the very top of the startup path, so the decision costs
 * one file read on a healthy host.
 */
export declare function decideCrashLoopRollback(input: CrashLoopRollbackInput): CrashLoopRollbackVerdict;
export interface CrashLoopReceiptInput {
    readonly failedStarts: number;
    readonly restored: readonly {
        readonly label: string;
    }[];
    readonly at: number;
}
/**
 * The owner-facing receipt for an automatic rollback. It names what happened,
 * how the daemon decided, and which files went back, a restart that silently
 * changed versions would be worse than the crash loop it fixed.
 */
export declare function crashLoopRollbackReceipt(input: CrashLoopReceiptInput): string;
//# sourceMappingURL=boot-rollback.d.ts.map