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+# Deploy arbitrary Kubernetes resources as broker
+
+## Background
+
+Currently, a broker is defined as either a Job or a Pod, and can be accompanied by a Configuration level Service and an Instance level service, as shown in following YAML example.
+
+```yaml
+apiVersion: akri.sh/v0
+kind: Configuration
+metadata:
+  name: akri-debug-echo-foo
+spec:
+  brokerSpec:
+    brokerPodSpec:
+      containers:
+      - name: akri-debug-echo-foo-broker
+        image: "nginx:stable-alpine"
+        resources:
+          requests:
+            "{{PLACEHOLDER}}" : "1"
+            memory: 10Mi
+            cpu: 10m
+          limits:
+            "{{PLACEHOLDER}}" : "1"
+            memory: 30Mi
+            cpu: 29m
+  instanceServiceSpec:
+    type: ClusterIP
+    ports:
+    - name: akri-debug-echo-foo-instance-service
+      port: 6052
+      protocol: TCP
+      targetPort: 6052
+  configurationServiceSpec:
+    type: ClusterIP
+    ports:
+    - name: akri-debug-echo-foo-configuration-service
+      port: 6052
+      protocol: TCP
+      targetPort: 6052
+```
+
+This limits the interoperability of Akri with other Kubernetes based components that would benefit from Akri creating CRs or other Kubernetes native resources.
+For example Akri could act as the discovery component of a larger system that leverage Digital Twins with [Shifu](https://shifu.dev/).
+
+## New broker definition
+
+The idea behind the new broker definition is to provide two fields `instanceBrokerResources` and `configurationBrokerResources` that will contain a list of Kubernetes resources to deploy.
+
+Instance level resources will get deployed for every instance, and Configuration level ones will get deployed once for a Configuration with at least a discovered Instance.
+
+Akri will still add Configuration and Instance labels to resources it creates.
+
+## New template variables
+
+All those possibilities requires something a bit more advanced than the current `{{PLACEHOLDER}}` replacement, as the resources might need additional fields like the Instance name, or some of its properties.
+To cover this let's have a couple of other "variables" that would replace the `PLACEHOLDER` one:
+
+| Variable | Description |
+| -------- | ----------- |
+| INSTANCE_NAME | The name of the instance |
+| INSTANCE_PROPERTIES | Dictionary with the `brokerProperties` of the Instance |
+| LABEL_SELECTOR | Label Selector that matches instance level resources (only this instance when used in an instance level resource, all instances when used in configuration level resource)|
+| NODES | List of node the instance is available on |
+
+## Example
+
+The previous example would the looks like this:
+
+```yaml
+apiVersion: akri.sh/v0
+kind: Configuration
+metadata:
+  name: akri-debug-echo-foo
+spec:
+  instanceBrokerResources:
+  - apiVersion: v1
+    kind: Pod
+    metadata:
+      name: "{{INSTANCE_NAME}}-pod"
+    spec:
+      containers:
+      - name: akri-debug-echo-foo-broker
+        image: "nginx:stable-alpine"
+        resources:
+          requests:
+            "akri.sh/{{INSTANCE_NAME}}" : "1"
+            memory: 10Mi
+            cpu: 10m
+          limits:
+            "akri.sh/{{INSTANCE_NAME}}" : "1"
+            memory: 30Mi
+            cpu: 29m
+  - apiVersion: v1
+    kind: Service
+    metadata:
+      name: "{{INSTANCE_NAME}}-svc"
+    spec:
+      type: ClusterIP
+      ports:
+      - name: akri-debug-echo-foo-instance-service
+        port: 6052
+        protocol: TCP
+        targetPort: 6052
+      selector: {{LABEL_SELECTOR}}
+  configurationBrokerResources:
+  - apiVersion: v1
+    kind: Service
+    metadata:
+      name: akri-debug-echo-foo-svc
+    spec:
+      type: ClusterIP
+      ports:
+      - name: akri-debug-echo-foo-configuration-service
+        port: 6052
+        protocol: TCP
+        targetPort: 6052
+      selector: {{LABEL_SELECTOR}}
+```
+
+## Technical implementation ideas
+
+This proposal implies many changes, and most importantly makes a breaking change to the CRD. It also implies a lot of changes to the controller and the admission webhook.
+
+For the CRD itself, we can make use of `x-kubernetes-embedded-resource` that should help with validating the asked object is valid.
+
+For the deployment, the RBAC would need to be much more permissive for the controller, probably allowing pretty much everything.
+
+The admission webhook will also have to deal with mostly unspecified objects, one way to effectively solve this would be to try dry-run submit the resources to be created with a dummy instance.
+
+The controller will have to watch over every object it owns without prior knowledge of its type.