That's the aquarium heater in there doing it's job. The beer line is in red, the peaks on the graph now in the other colours are for other probes that are not in the beer. Guessing the orange one that has shown the biggest movement is the one that's on top of the washing machine, the other one is air temperature in the utility room...
Paul Clarke's blog - I live in A small town, Kent. Wed + father to two, I am a full-stack web engineer, and I do js / nodejs, some ruby, python, php ect ect. I like pubs, parkrun, eating, home automation + other diy stuff, history, tree stuff, TV, squirrels, pirates, lego, and TIME TRAVEL.