Update a.core_concepts.md

[zhaohuabing]

No description provided.

[dgkanatsios]

thank you! Is this a recent change on Kubernetes APIs?

[zhaohuabing]

Kubernetes documentation says that the cpu and memory resource have two types of quota: limits and requests.

Resource Name	Description
limits.cpu	Across all pods in a non-terminal state, the sum of CPU limits cannot exceed this value.
limits.memory	Across all pods in a non-terminal state, the sum of memory limits cannot exceed this value.
requests.cpu	Across all pods in a non-terminal state, the sum of CPU requests cannot exceed this value.
requests.memory	Across all pods in a non-terminal state, the sum of memory requests cannot exceed this value.

Based on the context of the asked question, I think we should use limits quota here.

[pacozaa]

@zhaohuabing Check out the https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#-em-quota-em-

hard is A comma-delimited set of resource=quantity pairs that define a hard limit.

This means it's already --hard means to set hard limit already, so no need to redundant the limit part.