docs: Add documentation for storage/size based retention policy

Signed-off-by: Parthiba-Hazra <[email protected]>

Author: Parthiba-Hazra

docs/retention_policy.md

@@ -36,10 +36,14 @@ spec:
   #     pod: <pod_name>
   #     container: <container_name>
   #     maxCheckpoints: 5
+  #     maxCheckpointSize: 6  # Maximum size of a single checkpoint in MB
+  #     maxTotalSize: 20  # Maximum total size of checkpoints for the container in MB
   # podPolicies:
   #   - namespace: <namespace>
   #     pod: <pod_name>
   #     maxCheckpoints: 10
+  #     maxCheckpointSize: 8  # Maximum size of a single checkpoint in MB
+  #     maxTotalSize: 50  # Maximum total size of checkpoints for the pod in MB
   # namespacePolicies:
   #   - namespace: <namespace>
   #     maxCheckpoints: 15` 
@@ -48,24 +52,34 @@ A sample configuration file is available [here](/config/samples/_v1_checkpointre
 
 ## Understanding Policy Fields
 
--   `checkpointDirectory`: Specifies the directory where checkpoints are stored.
--   `applyPoliciesImmediately`: If set to `true`, the policies are applied immediately. If `false` (default value), they are applied after new checkpoint creation.
--   `globalPolicy`: Defines global checkpoint retention limits.
-    -   `maxCheckpointsPerNamespace`: Maximum number of checkpoints per namespace.
-    -   `maxCheckpointsPerPod`: Maximum number of checkpoints per pod.
-    -   `maxCheckpointsPerContainer`: Maximum number of checkpoints per container.
--   `containerPolicies` (optional): Specific retention policies for containers.
-    -   `namespace`: Namespace of the container.
-    -   `pod`: Pod name of the container.
-    -   `container`: Container name.
-    -   `maxCheckpoints`: Maximum number of checkpoints for the container.
--   `podPolicies` (optional): Specific retention policies for pods.
-    -   `namespace`: Namespace of the pod.
-    -   `pod`: Pod name.
-    -   `maxCheckpoints`: Maximum number of checkpoints for the pod.
--   `namespacePolicies` (optional): Specific retention policies for namespaces.
-    -   `namespace`: Namespace name.
-    -   `maxCheckpoints`: Maximum number of checkpoints for the namespace.
+-   **`checkpointDirectory`**: Specifies the directory where checkpoints are stored.
+-   **`applyPoliciesImmediately`**: If set to `true`, the policies are applied immediately. If `false` (default value), they are applied after new checkpoint creation.
+-   **`globalPolicy`**: Defines global checkpoint retention limits.
+    -   **`maxCheckpointsPerNamespace`**: Maximum number of checkpoints per namespace.
+    -   **`maxCheckpointsPerPod`**: Maximum number of checkpoints per pod.
+    -   **`maxCheckpointsPerContainer`**: Maximum number of checkpoints per container.
+    -   **`maxCheckpointSize`**: Maximum size of a single checkpoint in MB.
+    -   **`maxTotalSizePerNamespace`**: Maximum total size of checkpoints per namespace in MB.
+    -   **`maxTotalSizePerPod`**: Maximum total size of checkpoints per pod in MB.
+    -   **`maxTotalSizePerContainer`**: Maximum total size of checkpoints per container in MB.
+-   **`containerPolicies`** (optional): Specific retention policies for containers.
+    -   **`namespace`**: Namespace of the container.
+    -   **`pod`**: Pod name of the container.
+    -   **`container`**: Container name.
+    -   **`maxCheckpoints`**: Maximum number of checkpoints for the container.
+    -   **`maxCheckpointSize`**: Maximum size of a single checkpoint in MB.
+    -   **`maxTotalSize`**: Maximum total size of checkpoints for the container in MB.
+-   **`podPolicies`** (optional): Specific retention policies for pods.
+    -   **`namespace`**: Namespace of the pod.
+    -   **`pod`**: Pod name.
+    -   **`maxCheckpoints`**: Maximum number of checkpoints for the pod.
+    -   **`maxCheckpointSize`**: Maximum size of a single checkpoint in MB.
+    -   **`maxTotalSize`**: Maximum total size of checkpoints for the pod in MB.
+-   **`namespacePolicies`** (optional): Specific retention policies for namespaces.
+    -   **`namespace`**: Namespace name.
+    -   **`maxCheckpoints`**: Maximum number of checkpoints for the namespace.
+    -   **`maxCheckpointSize`**: Maximum size of a single checkpoint in MB.
+    -   **`maxTotalSize`**: Maximum total size of checkpoints for the namespace in MB.
 
 ## Policy Hierarchy and Application