Using which two metrics gathered by Celiometer does OpenStack manage VM-Series firewall instances?

OpenStack manages VM-Series firewall instances using key performance indicators that are crucial for assessing the operational efficiency of virtual machines. CPU Utilization is one of the primary metrics used because it directly correlates to the performance and responsiveness of a firewall instance. This metric helps administrators monitor how much of the CPU resources are being consumed by the firewall, enabling them to make informed decisions regarding scaling, load balancing, and resource allocation.

High CPU utilization might indicate that the VM-Series firewall is under heavy load or facing a traffic surge, which could necessitate adjustments in resources or configurations. Monitoring this metric ensures that the firewall can effectively handle incoming and outgoing traffic without degradation of service levels.

While other metrics like memory utilization, incoming bytes per second, and outgoing bytes per second are also relevant to the overall performance and effectiveness of firewalls, they are not the primary indicators used in managing VM-Series instances by OpenStack. CPU Utilization serves as a fundamental measure that has a direct impact on the functioning of virtual machines in this context.