Add random login string after login.

random_login.php

function jpr_generateRandomString($length = 10) {
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $charactersLength = strlen($characters);
    $randomString = '';
    for ($i = 0; $i < $length; $i++) {
        $randomString .= $characters[rand(0, $charactersLength - 1)];
    }
    return $randomString;
}

function jpr_login_clearing_cache( $redirect_to, $request, $user ) {
		global $user;

		if ( isset( $user->roles ) && is_array( $user->roles ) ) {

				if ( in_array( 'administrator', $user->roles ) ) {
						return $redirect_to . '?login=' . jpr_generateRandomString();
				} else {
					return $redirect_to . '?login=' . jpr_generateRandomString();
				}
		} else {
				return $redirect_to;
		}
}
add_filter( 'login_redirect', 'jpr_login_clearing_cache', 10, 3 );