No metric collected when no "tencent.com/vcuda-core" assigned

[xiaoFine]

I deployed my app via SeldonCore and Triton Server in an k8s, and found no metrics collected when tencent.com/vcuda-core is skipped in deployment.yaml. Is that a bug or the tencent.com/vcuda-core must be configed for each deployment?

### metrics are collected when vcude-core set
resources:
    limits:
         tencent.com/vcuda-core:    50
         tencent.com/vcuda-memory:  3
    requests:
          tencent.com/vcuda-core:    50
          tencent.com/vcuda-memory:  3

### metrics are not collected when no vcuda-core set
resources:
    limits:
        tencent.com/vcuda-memory:  3
    requests:
        tencent.com/vcuda-memory:  3