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+# Proposal: P2P Preheat Enhancement
+
+Author: [Chenyu Zhang](https://github.com/chlins)
+
+## Abstract
+
+This proposal aims to expand the p2p preheat policy to accommodate a wider range of configurations and scenarios.
+To achieve this, one options will be added to the policy: extra attributes.
+
+## Motivation
+
+The current Harbor p2p preheat policy offers basic options like filters and triggers. However, these are tailored
+from Harbor's perspective, omitting the p2p or preheat viewpoints, particularly in today's AI-driven scenarios.
+Users might need to preheat images to p2p clusters with additional p2p related configurations or parameters.
+This proposal aims to broaden the p2p preheat policy to accommodate more flexible configurations and scenarios.
+
+## Solution
+
+Add the following options to the p2p preheat policy:
+
+- extra_attrs: The additional attributes that can be used to configure the preheat for vendor or provider specified arguments.
+This is a key-value pair as JSON format, and it's optional.
+
+## Goal
+
+1. Provides an extended parameter for users to specify provider-related or unique configurations.
+
+## Personas and User Stories
+
+This section lists the user stories regarding this enhancements for the different personas interacting with the p2p preheat.
+
+* Personas
+
+P2P Preheat is a System Administrator and Project Administrator operation in Harbor.
+
+* User Stories
+
+1. As a system/project administrator, I can create/update a p2p preheat policy with the scope set to "single_peer" or "all_peers".  (if use Dragonfly as p2p provider)
+2. As a system/project administrator, I can create/update a p2p preheat policy with extra attributes to configure the preheat for vendor or provider specified arguments.
+(e.g: I can set the cluster ids for dragonfly provider)
+
+* Scenario Cases
+
+1. If the user using the dragonfly as p2p provider, when he sets the scope to "single_peer", the preheat will only preheats the image to one peer in the cluster.
+2. If the user using the dragonfly as p2p provider, when he sets the scope to "all_peers", the preheat will preheats the image to all peers in the cluster.
+3. If the user using the dragonfly as p2p provider, when he sets the extra_attrs to {"cluster_ids": [1, 2, 3]}, the preheat will only preheats the image to the specified clusters.
+
+## Scheme Changes
+
+The schema changes are as follows:
+
+```sql
+ALTER TABLE p2p_preheat_policy ADD COLUMN IF NOT EXISTS extra_attrs json;
+```
+
+## UI
+
+The UI changes are as follows:
+
+1. Add a new field named "Scope" to the p2p preheat policy page, which can be set to "single_peer" or "all_peers". (only customization for dragonfly provider)
+2. Add a new field named "Extra Attributes" to the p2p preheat policy page, which is a key-value pair as JSON format.
+
+![p2p preheat policy](../images/p2p/p2p-preheat-policy-extra-attrs.jpg)
+
+## API
+
+No any breaking change for preheat policy, and not introduce the new APIs, just add the new field `extra_attrs` to payload for existing APIs.
+
+Payload example:
+
+```json
+{
+  "creation_time": "2024-10-30T07:11:36.349Z",
+  "enabled": true,
+  "filters": "[{\"type\":\"repository\",\"value\":\"**\"},{\"type\":\"tag\",\"value\":\"**\"}]",
+  "id": 4,
+  "name": "test",
+  "project_id": 1,
+  "provider_id": 2,
+  "provider_name": "d7y",
+  "trigger": "{\"type\":\"manual\",\"trigger_setting\":{\"cron\":\"\"}}",
+  "extra_attrs": "{\"cluster_ids\":[1,2,3], \"scope\":\"single_peer\"}",
+  "update_time": "2024-10-30T07:46:14.497Z"
+}
+```