Hello,
we are December 5, it's 1020 AM Eastern US time, 16:21 PM local Europe time.

The trading and order book in Bund and BOBL look quiet and empty.
Any reason why? Is it just time of day or is there something special today?

You need to Roll Your contract. Now you have to trade the march contract.

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Thank you for your answer.
Isn't this supposed to be later in the month?

Is this specific to Bund/Bobl and related markets? I didn't notice this drop in EuroStoxx.

Bund always rolls before the equity-futures (FDAX, EuroStoxx50..)

Same in USA, bonds/notes already rolled last week, equity-futures (ES, NQ...) will roll next week

Because of Bund, you just have to watch the volume, March volume is 13times the Dec volume