feat(docs): migrate documentation site into monorepo (#5912)

apps/docs/docs/advanced/development/kubernetes.mdx

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+---
+title: Kubernetes
+tags:
+  - Developer
+  - Technical documentation
+  - Code
+  - Programming
+sidebar_position: 1
+---
+
+This guide provides step-by-step instructions for setting up a Kubernetes cluster using kind, configuring multiple nodes, and installing the Metrics Server.
+
+## Prerequisites
+
+Ensure you have the following installed:
+
+- [Docker](https://docs.docker.com/get-started/get-docker/) (required for running `kind` clusters).
+- [Kind](https://kind.sigs.k8s.io/docs/user/quick-start/) (Kubernetes in Docker).
+- [Kubectl](https://kubernetes.io/docs/tasks/tools/) (Kubernetes command-line tool).
+
+Additionally, ensure that Kubernetes tools are enabled in your environment by setting the following variable in your `.env` file:
+
+```bash
+# Enable Kubernetes tool
+ENABLE_KUBERNETES=true
+```
+
+### 1. Creating a Kubernetes Cluster with Multiple Nodes
+
+We will create a Kubernetes cluster using `kind` with one control plane node and two worker nodes.
+
+#### Define the Cluster Configuration
+
+Create a configuration file named `kind-config.yaml` with the following content:
+
+```bash
+cat > kind-config.yaml <<EOF
+# three node (two workers) cluster config
+kind: Cluster
+apiVersion: kind.x-k8s.io/v1alpha4
+nodes:
+- role: control-plane
+  kubeadmConfigPatches:
+    - |
+      kind: KubeletConfiguration
+      apiVersion: kubelet.config.k8s.io/v1beta1
+      kubeReserved:
+        cpu: "250m"
+        memory: "256Mi"
+      systemReserved:
+        cpu: "500m"
+        memory: "512Mi"
+      evictionHard:
+        memory.available: "200Mi"
+- role: worker
+- role: worker
+EOF
+```
+
+#### Create the Cluster
+
+Run the following command to create the Kubernetes cluster:
+
+```bash
+kind create cluster --name k8s-playground --config kind-config.yaml
+```
+
+This will provision a cluster named `k8s-playground` with the specified node configuration.
+
+### 2. Installing the Metrics Server
+
+The Metrics Server is required for gathering resource utilization metrics like CPU and memory usage. It is essential for features such as Horizontal Pod Autoscaling.
+
+#### Deploy the Metrics Server
+
+Run the following command to install the Metrics Server:
+
+```bash
+kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.7.2/components.yaml
+```
+
+#### Disable TLS Verification (For Local Development)
+
+In local environments, Kubernetes nodes might not have valid certificates. To disable TLS verification, patch the deployment:
+
+```bash
+kubectl patch -n kube-system deployment metrics-server --type=json \
+  -p '[{"op":"add","path":"/spec/template/spec/containers/0/args/-","value":"--kubelet-insecure-tls"}]'
+```
+
+This allows the Metrics Server to communicate with kubelets that use self-signed certificates.
+
+### 3. Verifying the Setup
+
+After completing the setup, verify that the cluster is running correctly:
+
+#### Check the Cluster Nodes
+
+```bash
+kubectl get nodes
+```
+
+Expected output:
+
+```bash
+NAME                           STATUS   ROLES           AGE     VERSION
+k8s-playground-control-plane   Ready    control-plane   Xs      vX.Y.Z
+k8s-playground-worker          Ready    worker          Xs      vX.Y.Z
+k8s-playground-worker2         Ready    worker          Xs      vX.Y.Z
+```
+
+#### Check Metrics Server Status
+
+```bash
+kubectl get deployment -n kube-system metrics-server
+```
+
+Expected output:
+
+```bash
+NAME             READY   UP-TO-DATE   AVAILABLE   AGE
+metrics-server   1/1     1            1           Xs
+```
+
+#### Get Node Resource Metrics
+
+```bash
+kubectl top nodes
+```
+
+This command should return CPU and memory usage statistics for each node.
+
+## Conclusion
+
+You have successfully set up a multi-node Kubernetes cluster using kind and installed the Metrics Server for monitoring resource usage. This setup is useful for local development and testing Kubernetes workloads before deploying them to a production environment.