The memory usage keeps increasing for File Integrity Operator

Description of problem:

The memory usage keeps increasing for File Integrity Operator. It increases from 566MiB to 805 MiB in 3 hours

Version-Release number of selected component (if applicable):

4.12.2 + file-integrity-operator.v1.0.0-14

How reproducible:

Always

Steps to Reproduce:

1. Install File Integrity Operator
2. Create a fileintegrity:

oc apply -f - <<EOF

apiVersion: fileintegrity.openshift.io/v1alpha1

kind: FileIntegrity

metadata:

  name: example-fileintegrity

  namespace: openshift-file-integrity

spec:

  debug: false

  config: 

    gracePeriod: 900

EOF

   3. Check the memory usage status on web console after several hours

Actual results:

The memory usage keeps increasing for File Integrity Operator. It increases from 566MiB to 805 MiB in 3 hours

Expected results:

There should be no obvious memory increase.

Additional info:

The operator was installed in single namespace:  openshift-file-integrity