add Kubernetes footprint calculation

pages/environmental-footprint/additional-content/kubernetes-env-footprint.mdx

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+---
+title: Kubernetes footprint calculation
+description: This page explains how Scaleway calculates the environmental footprint of its Kubernetes clusters in detail.
+tags: kubernetes environmental-footprint impact datacentre
+dates:
+  validation: 18/12/25
+  posted: 30/01/25
+---
+
+This page includes the specificities of the environmental footprint calculation for Lubernetes.
+
+## Calculation aspects
+
+A Kubernetes cluster consists of two parts: the control plane and pools, which are made up of node instances. The impact of the nodes is already calculated as part of the instance impact calculation (https://www.scaleway.com/en/docs/environmental-footprint/additional-content/instances-env-footprint/). The purpose of this page is to detail the calculation of the control plane's impact.
+
+The total estimated impact of Kubernetes control plane is calculated by integrating the:
+
+- **Dedicated manufacturing impact** - Related to the physical servers hosting the kubernetes control plane.
+- **Related manufacturing impact** - The impact of the tools used to manage the kubernetes offers: internal control plane, monitoring, and others.
+- **Energy usage impact** - The average electricity consumption of servers and their energy efficiency and of the tools used to manage the Kubernetes offers.
+
+### Ratio per control plane
+
+Kubernetes control planes are implemented on internal Kubernetes clusters composed of virtual machines and load balancers.
+The cluster's impact is therefore, according to the RCP, the sum of the impacts of the virtual machines and load balancers.
+For mutualised offers, the cluster's impact is distributed among the different customers. For the dedicated offers, the entire cluster impact is allocated to the customers.
+
+### Manufacturing impact
+
+The calculation of the manufacturing impact of kubernetes is based on:
+
+- The manufacturing impact of [instances](https://www.scaleway.com/en/docs/environmental-footprint/additional-content/instances-env-footprint/) and [load balancers](https://www.scaleway.com/en/docs/environmental-footprint/additional-content/load-balancer-env-footprint/) used to host users' kubernetes control plane
+- The manufacturing impact of servers used by the Scaleway Kubernetes team to manage the service
+
+#### Calculation example
+
+For the example below, we consider a dedicated kubernetes control plane made of two instances with a dedicated manufacturing impact of 2gCO2e/hour each and a load balancer with a dedicated manufacturing impact of 3gCO2e/hour. We measure the impact of 100 hours. We make the following calculation:
+
+```
+KubernetesDedicatedImpact = (2 * 2 + 3) * 100 = 700 gCO2e
+```
+
+In the example, the dedicated manufacturing impact of a dedicated kubernetes control plane usage for 100 hours is 700 gCo2e.
+
+### Usage impact
+
+The calculation of the usage impact of Kubernetes control plane is based on:
+
+- Impact of electricity consumption of Instances that host the kubernetes conrol plane
+- Impact of electricity consumption of infrastructure and service management servers by the Scaleway Kubernetes team to run the Kubernetes service.
+
+To calculate the impact of a kwh, we consider the French energy mix and the datacenter's PUE.
+
+In the example below, they are 0,065gCo2e/wh and 1,16, respectively. Considering a dedicated kubernetes control plane made of two instances with an electrical consumption of 6wh each  and a load balancer with an electrical consumption of 5wh. Considering 100 hours of usage, the total usage impact comes down to:
+
+```math
+UsageImpact = (2 * 6 + 5) * 100 * 0,065 * 1,16 = 128 gCo2e
+```
+
+In the example, the usage impact of a dedicated kubernetes control plane usage for 100 hours is 128 gCo2e.