Added instructions to install KRR in-cluster (#387)

Author: pavangudiwada

README.md

@@ -189,6 +189,28 @@ us-central1-docker.pkg.dev/genuine-flight-317411/devel/krr:v1.8.3
 We do **not** recommend installing KRR from source in airgapped environments due to the headache of installing Python dependencies. Use one of the above methods instead and contact us (via Slack, GitHub issues, or email) if you need assistance.
 </details>
 
+<details>
+  <summary>In-Cluster</summary>
+
+Apart from running KRR as a CLI tool you can also run KRR inside your cluster. We suggest installing KRR via the <a href="https://platform.robusta.dev/signup">Robusta Platform</a>
+. It gives you a <a href="https://platform.robusta.dev/signup">free UI</a> with some features like the following
+* View application usage history graphs on which recommendations are based.
+* Get application, namespace and cluster level recommendations.
+* YAML configuration to apply the suggested recommendation and more
+
+<img src="./images/ui_screenshot_new.png">
+
+<img src="./images/ui_recommendation.png">
+
+You can also run KRR in-cluster as a Kubernetes Job, if you don't want to view results easily in a <a href="https://platform.robusta.dev/signup">UI</a>. 
+
+```
+kubectl apply -f https://raw.githubusercontent.com/robusta-dev/krr/refs/heads/main/docs/krr-in-cluster/krr-in-cluster-job.yaml
+
+```
+</details>
+
+
 <details>
   <summary>From Source</summary>
 

docs/krr-in-cluster/krr-in-cluster-job.yaml

@@ -0,0 +1,122 @@
+kind: ClusterRole
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: krr-cluster-role
+  namespace: default
+rules:
+  - apiGroups:
+      - ""
+    resources:
+      - configmaps
+      - daemonsets
+      - deployments
+      - namespaces
+      - pods
+      - replicasets
+      - replicationcontrollers
+      - services
+    verbs:
+      - get
+      - list
+      - watch
+
+  - apiGroups:
+      - ""
+    resources:
+      - nodes
+    verbs:
+      - get
+      - list
+      - watch
+
+  - apiGroups:
+      - apps
+    resources:
+      - daemonsets
+      - deployments
+      - deployments/scale
+      - replicasets
+      - replicasets/scale
+      - statefulsets
+    verbs:
+      - get
+      - list
+      - watch
+
+  - apiGroups:
+      - extensions
+    resources:
+      - daemonsets
+      - deployments
+      - deployments/scale
+      - ingresses
+      - replicasets
+      - replicasets/scale
+      - replicationcontrollers/scale
+    verbs:
+      - get
+      - list
+      - watch
+  - apiGroups:
+      - batch
+    resources:
+      - cronjobs
+      - jobs
+    verbs:
+      - get
+      - list
+      - watch
+  - apiGroups:
+      - "autoscaling"
+    resources:
+      - horizontalpodautoscalers
+    verbs:
+      - get
+      - list
+      - watch
+
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: krr-service-account
+  namespace: default
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: krr-cluster-role-binding
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: krr-cluster-role
+subjects:
+  - kind: ServiceAccount
+    name: krr-service-account
+    namespace: default
+
+---
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: krr
+  namespace: default
+spec:
+  template:
+    spec:
+      containers:
+        - command:
+            - /bin/sh
+            - -c
+            - "python krr.py simple   --max-workers 3 --width 2048 "
+          image: robustadev/krr:v1.17.0
+          imagePullPolicy: Always
+          name: krr
+          resources:
+            limits:
+              memory: 2Gi
+            requests:
+              memory: 1Gi
+      restartPolicy: Never
+      serviceAccount: krr-service-account
+      serviceAccountName: krr-service-account