custom.metrics.k8s.io not found in cluster

[chaosi-zju]

What happened:

when I installed Karmada by local-up-karmada.sh, there are so many warning log in karmada-metrics-adapter, just like:

W0402 09:33:19.871185       1 custommetrics.go:306] custom.metrics.k8s.io not found in cluster(member3)
W0402 09:33:19.871786       1 custommetrics.go:306] custom.metrics.k8s.io not found in cluster(member2)
W0402 09:33:19.872300       1 custommetrics.go:306] custom.metrics.k8s.io not found in cluster(member3)
W0402 09:33:19.872441       1 custommetrics.go:306] custom.metrics.k8s.io not found in cluster(member3)
W0402 09:33:19.874165       1 custommetrics.go:306] custom.metrics.k8s.io not found in cluster(member3)
W0402 09:33:19.876792       1 custommetrics.go:306] custom.metrics.k8s.io not found in cluster(member2)
W0402 09:33:19.876940       1 custommetrics.go:306] custom.metrics.k8s.io not found in cluster(member2)
W0402 09:33:19.877613       1 custommetrics.go:306] custom.metrics.k8s.io not found in cluster(member2)
W0402 09:33:19.877877       1 custommetrics.go:306] custom.metrics.k8s.io not found in cluster(member2)
W0402 09:33:19.879804       1 custommetrics.go:306] custom.metrics.k8s.io not found in cluster(member1)
W0402 09:33:19.880877       1 custommetrics.go:306] custom.metrics.k8s.io not found in cluster(member1)
W0402 09:33:19.881422       1 custommetrics.go:306] custom.metrics.k8s.io not found in cluster(member1)
W0402 09:33:19.882611       1 custommetrics.go:306] custom.metrics.k8s.io not found in cluster(member1)
W0402 09:33:19.882814       1 custommetrics.go:306] custom.metrics.k8s.io not found in cluster(member1)
W0402 09:33:19.883410       1 custommetrics.go:306] custom.metrics.k8s.io not found in cluster(member1)
...

what does the log mean, and whether there is a problem?

What you expected to happen:

no so many warning log.

How to reproduce it (as minimally and precisely as possible):

just install Karmada by local-up-karmada.sh.

Anything else we need to know?:

Environment:

• Karmada version: latest
• kubectl-karmada or karmadactl version (the result of kubectl-karmada version or karmadactl version):
• Others: