def open(self) -> None:
        """Open watchdog device.

        When watchdog is opened keepalive must be called. Returns nothing on success
        or raises WatchdogError if the device could not be opened."""
Open watchdog device.

        When watchdog is opened keepalive must be called. Returns nothing on success
        or raises WatchdogError if the device could not be opened.
patroni/watchdog/base.py