Drive Space Issues with DeviceMapper

Hi, I am experiencing drive space issues on one of my servers. I have deployed several containers on my server and every day my drive space continues to be filled up with contents inside of /var/lib/devicemapper/devicemapper and /var/lib/devicemapper/mnt. Could someone please tell me what information these directories store and what’s the best way to clear up drive space without damaging any operations? Thanks.