Which feature of OpenStack influences service scaling based on traffic metrics?

Celiometer is the component of OpenStack that provides telemetry services, which collect and store measurements of various resources within the OpenStack environment. This feature is integral for influencing service scaling based on traffic metrics because it allows for the monitoring of resource usage, events, and performance data. By gathering these metrics, administrators can make informed decisions about when to scale services up or down to meet varying demand.

Effective scaling relies on accurate data regarding the current load and resource usage; thus, Celiometer supports automated scaling mechanisms by providing real-time insights into how services are performing. This telemetry data can trigger scaling activities, ensuring that resources are allocated efficiently in response to traffic spikes or drops.

In contrast, Heat Templates are used for orchestration and defining resource stacks but do not directly involve traffic metrics for scaling purposes. Nova Scheduler's primary function is to manage the allocation of compute resources rather than monitoring metrics, and Neutron Networking focuses on managing networking within OpenStack, not directly influencing scaling based on service demand. This makes Celiometer the key feature for scaling services in response to observed traffic metrics.