Comprehensive and Detailed Explanation From Exact Extract:
Within a vSphere Namespace, administrators have the ability to configure resource limits to control the amount of resources that workloads can consume. According to the official VMware Cloud Foundation documentation, the three types of resource limits that can be set on a vSphere Namespace are:
CPU: The administrator can specify the maximum CPU resources that can be used within the namespace.
Memory: The administrator can define the maximum amount of memory allocated to workloads in the namespace.
Storage: The administrator can configure storage limits, specifying how much storage capacity is available to the namespace.
These resource limits are essential for managing and isolating resources across different namespaces to prevent resource contention and ensure fair resource distribution. The documentation clearly states that there is no option to set a resource limit based on the number of containers or network bandwidth within the vSphere Namespace configuration. The focus is solely on controlling CPU, memory, and storage resources.

TPS (A) deduplicates identical memory pages, the balloon driver (C) reclaims unused guest memory, and right-sizing (D) avoids over-allocation. Memory reservations on every VM (B) can cause resource contention if overused.

vSAN Encryption (A) secures data at rest on vSAN, and VM Encryption (B) protects specific VM disks.
Ephemeral port groups (C) relate to networking, not storage encryption, and secure logging (D) ensures log integrity but doesn't encrypt VM data.

Running a compatibility pre-check validates that vCenter, ESXi, NSX, and other components meet the requirements for the target VCF version.
Backing up SDDC Manager, vCenter, NSX, and other critical components ensures you can roll back if the upgrade encounters issues.
The SDDC Manager UI provides an orchestrated upgrade workflow, downloading and applying the required bundles in the correct order.

The administrator should review the CPU usage of the ESXi hosts to identify if any hosts are overcommitted. Overcommitted hosts can lead to performance degradation across workloads.
Checking the resource limits and reservations on Kubernetes namespaces is crucial. If the resource limits are too low or improperly configured, it could cause degraded performance for workloads running in those namespaces.