chore: [CHAOS-7252]: Add transaction percentage support in dns

docs/chaos-engineering/use-harness-ce/chaos-faults/kubernetes/pod/pod-dns-error.md

@@ -99,6 +99,11 @@ permissions:
         <td> Determines whether the DNS query exactly matches one of the targets or uses any of the targets as a substring. It can be <code>exact</code> or <code>substring</code>. </td>
         <td> If this is not provided, it is set to <code>exact</code>. For more information, go to <a href="#match-scheme">match scheme</a></td>
       </tr>
+      <tr>
+        <td> TRANSACTION_PERCENTAGE </td>
+        <td> Percentage of the dns queries to be affected. </td>
+        <td> It supports values in range (0,100]. It targets all requests if not provided. For more information, go to <a href="#trasaction-percentage">transaction percentage </a>.</td>
+      </tr>
       <tr>
         <td> PODS_AFFECTED_PERC </td>
         <td> Percentage of total pods to target. Provide numeric values. </td>
@@ -226,6 +231,40 @@ spec:
           value: '60'
 ```
 
+### Transaction Percentage
+
+The percentage of dns queries to be affected, with supported values in the range (0, 100]. If not specified, it targets all queries. Tune it by using the `TRANSACTION_PERCENTAGE` environment variable.
+
+The following YAML snippet illustrates the use of this environment variable:
+
+[embedmd]:# (./static/manifests/pod-dns-error/transaction-percentage.yaml yaml)
+```yaml
+# contains transaction percentage for the dns error
+apiVersion: litmuschaos.io/v1alpha1
+kind: ChaosEngine
+metadata:
+  name: engine-nginx
+spec:
+  engineState: "active"
+  annotationCheck: "false"
+  appinfo:
+    appns: "default"
+    applabel: "app=nginx"
+    appkind: "deployment"
+  chaosServiceAccount: litmus-admin
+  experiments:
+  - name: pod-dns-error
+    spec:
+      components:
+        env:
+        # provide the transaction percentage within (0,100] range
+        # for example, it will affect 50% of the total dns queries
+        - name: TRANSACTION_PERCENTAGE
+          value: '50'
+        - name: TOTAL_CHAOS_DURATION
+          value: '60'
+```
+
 ### Container runtime and socket path
 
 The `CONTAINER_RUNTIME` and `SOCKET_PATH` environment variables to set the container runtime and socket file path, respectively.

docs/chaos-engineering/use-harness-ce/chaos-faults/kubernetes/pod/pod-dns-spoof.md

@@ -88,6 +88,11 @@ permissions:
         <td> Map of the target host names. For example, '&#123;"abc.com":"spoofabc.com"&#125;' where key is the host name to be spoofed and value is the host name to which the key is spoofed or redirected to.</td>
         <td> If not provided, no host names or domains are spoofed. </td>
       </tr>
+      <tr>
+        <td> TRANSACTION_PERCENTAGE </td>
+        <td> Percentage of the dns queries to be affected. </td>
+        <td> It supports values in range (0,100]. It targets all requests if not provided. For more information, go to <a href="#trasaction-percentage">transaction percentage </a>.</td>
+      </tr>
       <tr>
         <td> PODS_AFFECTED_PERC </td>
         <td> Percentage of total pods to target. Provide numeric values. </td>
@@ -154,6 +159,40 @@ spec:
               value: "60"
 ```
 
+### Transaction Percentage
+
+The percentage of dns queries to be affected, with supported values in the range (0, 100]. If not specified, it targets all queries. Tune it by using the `TRANSACTION_PERCENTAGE` environment variable.
+
+The following YAML snippet illustrates the use of this environment variable:
+
+[embedmd]:# (./static/manifests/pod-dns-spoof/transaction-percentage.yaml yaml)
+```yaml
+# contains transaction percentage for the dns spoofing
+apiVersion: litmuschaos.io/v1alpha1
+kind: ChaosEngine
+metadata:
+  name: engine-nginx
+spec:
+  engineState: "active"
+  annotationCheck: "false"
+  appinfo:
+    appns: "default"
+    applabel: "app=nginx"
+    appkind: "deployment"
+  chaosServiceAccount: litmus-admin
+  experiments:
+  - name: pod-dns-spoof
+    spec:
+      components:
+        env:
+        # provide the transaction percentage within (0,100] range
+        # for example, it will affect 50% of the total dns queries
+        - name: TRANSACTION_PERCENTAGE
+          value: '50'
+        - name: TOTAL_CHAOS_DURATION
+          value: '60'
+```
+
 ### Container runtime and socket path
 
 The `CONTAINER_RUNTIME` and `SOCKET_PATH` environment variables to set the container runtime and socket file path, respectively.

docs/chaos-engineering/use-harness-ce/chaos-faults/kubernetes/pod/static/manifests/pod-dns-error/transaction-percentage.yaml

@@ -0,0 +1,24 @@
+# contains transaction percentage for the dns error
+apiVersion: litmuschaos.io/v1alpha1
+kind: ChaosEngine
+metadata:
+  name: engine-nginx
+spec:
+  engineState: "active"
+  annotationCheck: "false"
+  appinfo:
+    appns: "default"
+    applabel: "app=nginx"
+    appkind: "deployment"
+  chaosServiceAccount: litmus-admin
+  experiments:
+    - name: pod-dns-error
+      spec:
+        components:
+          env:
+            # provide the transaction percentage within (0,100] range
+            # for example, it will affect 50% of the total dns queries
+            - name: TRANSACTION_PERCENTAGE
+              value: '50'
+            - name: TOTAL_CHAOS_DURATION
+              value: '60'

docs/chaos-engineering/use-harness-ce/chaos-faults/kubernetes/pod/static/manifests/pod-dns-spoof/transaction-percentage.yaml

@@ -0,0 +1,24 @@
+# contains transaction percentage for the dns spoofing
+apiVersion: litmuschaos.io/v1alpha1
+kind: ChaosEngine
+metadata:
+  name: engine-nginx
+spec:
+  engineState: "active"
+  annotationCheck: "false"
+  appinfo:
+    appns: "default"
+    applabel: "app=nginx"
+    appkind: "deployment"
+  chaosServiceAccount: litmus-admin
+  experiments:
+    - name: pod-dns-spoof
+      spec:
+        components:
+          env:
+            # provide the transaction percentage within (0,100] range
+            # for example, it will affect 50% of the total dns queries
+            - name: TRANSACTION_PERCENTAGE
+              value: '50'
+            - name: TOTAL_CHAOS_DURATION
+              value: '60'