Round number to #.#

okay thanks, but this string::format rounding values…
see here:
[vent.ItemStateChangedEvent] - PowerStrip_1_Port_2_Watt_Org changed from 684 to 536
[vent.ItemStateChangedEvent] - PowerStrip_1_Port_2_Watt changed from 0.7 to 0.5

BTW: how can i disable this kind of logging? (this will create up to 24 logs each 4 seconds)
Edit: i try it with the custom conftig from this thread: Log4j2 Sample Config

Regards, Web