export declare const MAX_INSTALL_ATTEMPTS = 3;
export declare const INSTALL_RETRY_BACKOFFS_MS: readonly number[];
export declare const BOOT_VERIFY_TIMEOUT_MS: number;
export declare const MAX_ROLLBACK_ATTEMPTS = 2;
export type BootVerificationPhase = 'installing' | 'install_failed' | 'install_blocked' | 'awaiting_boot' | 'rolling_back';
export interface BootVerificationRecord {
    phase: BootVerificationPhase;
    previousVersion: string;
    targetVersion: string;
    bootAttempts: number;
    installFailures: number;
    lastInstallFailureAtMs: number | null;
    rollbackAttempts: number;
    reason: string;
    updatedAtMs: number;
}
export interface UpdatePinRecord {
    version: string;
    reason: string;
    pinnedAtMs: number;
}
export declare function bootStatePath(dir?: string): string;
export declare function updatePinPath(dir?: string): string;
export declare function readBootVerificationRecord(dir?: string): BootVerificationRecord | null;
export declare function writeBootVerificationRecord(record: BootVerificationRecord, dir?: string): void;
export declare function clearBootVerificationRecord(dir?: string): void;
export declare function newInstallRecord(input: {
    previousVersion: string;
    targetVersion: string;
    nowMs: number;
    carryFrom?: BootVerificationRecord | null;
}): BootVerificationRecord;
export declare function withInstallFailure(record: BootVerificationRecord, nowMs: number, detail: string, maxAttempts?: number): BootVerificationRecord;
export declare function withAwaitingBoot(record: BootVerificationRecord, nowMs: number): BootVerificationRecord;
export declare function withBootAttempt(record: BootVerificationRecord, nowMs: number): BootVerificationRecord;
export declare function withRollbackAttempt(record: BootVerificationRecord, nowMs: number, detail: string): BootVerificationRecord;
export declare function readUpdatePin(dir?: string): UpdatePinRecord | null;
export declare function writeUpdatePin(pin: UpdatePinRecord, dir?: string): void;
export interface UpdateApprovalRecord {
    version: string;
    source: string;
    approvedAtMs: number;
}
export declare function updateApprovalPath(dir?: string): string;
export declare function readUpdateApproval(dir?: string): UpdateApprovalRecord | null;
export declare function writeUpdateApproval(approval: UpdateApprovalRecord, dir?: string): void;
export declare const UPDATE_WINDOW_ENV = "AWB_AGENT_MANAGER_UPDATE_WINDOW";
export interface MaintenanceWindow {
    startMinute: number;
    endMinute: number;
}
export declare function parseMaintenanceWindow(raw?: string | null): MaintenanceWindow | null;
export declare function isWithinMaintenanceWindow(now: Date, window: MaintenanceWindow | null): boolean;
export declare function withinMaintenanceWindowNow(now?: Date, raw?: string | null | undefined): boolean;
export type BootDecisionKind = 'none' | 'arm' | 'install_failed' | 'rollback' | 'pin_only' | 'rollback_landed' | 'rollback_failed' | 'stale';
export interface BootDecision {
    kind: BootDecisionKind;
    rollbackToVersion: string | null;
    summary: string | null;
}
export declare function evaluateBootVerification(input: {
    record: BootVerificationRecord | null;
    currentVersion: string;
    maxRollbackAttempts?: number;
}): BootDecision;
export declare function evaluateBootProbe(input: {
    heartbeatOk: boolean;
    elapsedMs: number;
    timeoutMs: number;
}): 'verified' | 'waiting' | 'failed';
export interface InstallRetryDecision {
    proceed: boolean;
    stop: boolean;
    waitMs: number | null;
    summary: string | null;
}
export declare function evaluateInstallRetryGate(input: {
    installFailures: number;
    lastFailureAtMs: number | null;
    nowMs: number;
    withinWindow: boolean;
    maxAttempts?: number;
    backoffsMs?: readonly number[];
}): InstallRetryDecision;