Nexus3.27 how to clean cache in k8s

Sonatype Nexus Repository
1

hello, we use nexus3.27 in k8s, but we found that nexus used cache too much , the nexus vm param likes that:

-Xms8g -Xmx8g -XX:+UseG1GC  -XX:MaxDirectMemorySize=35158M  -Djava.util.prefs.userRoot=/nexus-data

nexus-memory
nexus-memory1753×171 14.6 KB

this is memory usage detail. so i want to know how to clean cache ? thanks