Add Argo and k8s questions

Also updated Datadog questions.

topics/argo/exercises/canary_rollout/exercise.md

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+# Argo Rollouts - Canary
+
+## Requirements
+
+1. Running Kubernetes cluster
+2. Argo Rollouts CLI
+3. Deployed app in a specific version
+
+## Objectives
+
+1. Install Argo Rollouts controller
+2. Write a rollout manifest that use canary rollout strategy and apply it
+   1. Set it to 3 replicas
+   2. Disable auto-promotions
+3. Check the rollout list
+4. Rollout a new version of your app in any way you prefer
+   1. Check the status of the rollout
+
+## Solutions
+
+Click [here](solution.md) to view the solution.

topics/argo/exercises/canary_rollout/solution.md

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+# Argo Rollouts - Canary
+
+## Requirements
+
+1. Running Kubernetes cluster
+2. Argo Rollouts CLI
+3. Deployed app in a specific version
+
+## Objectives
+
+1. Install Argo Rollouts controller
+2. Write a rollout manifest that use canary rollout strategy and apply it
+   1. Set it to 6 replicas
+   2. Disable auto-promotions
+3. Check the rollout list
+4. Rollout a new version of your app in any way you prefer
+   1. Check the status of the rollout
+
+## Solution
+
+Installation:
+
+1. `kubectl create namespace argo-rollouts`
+   1. `kubectl apply -n argo-rollouts -f https://github.com/argoproj/argo-rollouts/releases/latest/download/install.yaml`
+
+2. Rollout resource:
+
+```
+---
+apiVersion: argoproj.io/v1alpha1
+kind: Rollout
+metadata:
+  name: some-app
+spec:
+  replicas: 6
+  strategy:
+    canary:
+      stableService: k8s-service-stable
+      canaryService: k8s-service-canary
+      trafficRouting:
+        ambassador:
+          mappings:
+            - k8s-mapping
+      steps:
+      - setWeight: 30
+      - pause: {}
+      - setWeight: 60
+      - pause: {}
+      - setWeight: 100
+      - pause: {}   
+  selector:
+    matchLabels:
+      app: some-web-app
+  template:
+    metadata:
+      labels:
+        app: some-web-app
+    spec:
+      containers:
+      - name: web-app
+        image: some/registry/and/image:v1.0
+        ports:
+        - name: http
+          containerPort: 8080
+          protocol: TCP
+```
+
+3. `kubectl argo rollouts list rollouts`
+4. `kubectl argo rollouts set image SOME-APP web-app=some/registry/and/image:v2.0`
+   1. `kubectl argo rollouts get rollout some-app --watch`