Allow operation but block system clock updates when an uncontrollable chronyd service is
running, except when this condition holds at startup. This is improved behavior when the
conflict is transient. It is, however, recommended in such situations to configure
sfptpd explicitly to treat the system clock as read
only. To disable this check at startup, configure as follows:
[general] ignore_critical clock-control-conflict
ignore_critical option in Configuration Options.