Badger is still there and works and supported, but no extra development effort is being spent on it.
You can optionally migrate a node to new setups like the hashtable and memtable, which is where all the effort is going:
[Tech Preview] Hashstore backend for storage nodes - Product Discussions / STORJLINGS - Storj Community Forum (official)
Still considered preview mode. Personally I’ve stuck with the old setup since it’s been fine under relatively low loads of traffic. (+I use badger on three nodes that have really slow storage and it helps on them).