Gitlab/prometheus/data/wal consuming more space. configuration to reduce space needed

our gitlab server is getting filled in quick time. when i checked gitlab/prometheus/data/wal consuming more space . its having data of 3 months . i need configurations in gitlab.rb file to reduce keep only 10 days data .

also, can i delete the existing data in the folder

ps: shows the configuration which disable the feature, we dont want it (prometheus[‘enable’] = false) . but we dont need this, we need only to keep data for 10 days
can anyone suggest