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+# KEP-5546: Automatic reload of nanny configuration when updated
+
+<!-- toc -->
+- [Summary](#summary)
+    - [Goals](#goals)
+    - [Non-Goals](#non-goals)
+- [Proposal](#proposal)
+    - [Notes](#notes)
+    - [Risks and Mitigations](#risks-and-mitigations)
+- [Design Details](#design-details)
+    - [Test Plan](#test-plan)
+<!-- /toc -->
+
+Sure, here's the enhancement proposal in the requested format:
+
+## Summary
+- **Goals:** The goal of this enhancement is to improve the user experience for applying nanny configuration changes in the addon-resizer 1.8 when used with the metrics server. The proposed solution involves automatically reloading the nanny configuration whenever changes occur, eliminating the need for manual intervention and sidecar containers. 
+- **Non-Goals:** This proposal does not aim to update the functional behavior of the addon-resizer.
+
+## Proposal
+The proposed solution involves updating the addon-resizer with the following steps:
+- Create a file system watcher using `fsnotify` under `utils/fswatcher` to watch nanny configurations' changes. It should run as a goroutine in the background.
+- Detect changes of the nanny configurations' file using the created `fswatcher` trigger the reloading process when configuration changes are detected. Events should be sent in a channel.
+- Re-execute the method responsible for building the NannyConfiguration `loadNannyConfiguration` to apply the updated configuration to the addon-resizer.
+- Proper error handling should be implemented to manage scenarios where the configuration file is temporarily inaccessible or if there are parsing errors in the configuration file.
+
+### Risks and Mitigations
+- There is a potential risk of filesystem-related issues causing the file watcher to malfunction. Proper testing and error handling should be implemented to handle such scenarios gracefully.
+- Errors in the configuration file could lead to unexpected behavior or crashes. The addon-resizer should handle parsing errors and fall back to the previous working configuration if necessary.
+
+## Design Details
+- Create a new package for the `fswatcher` under `utils/fswatcher`. It would contain the `fswatcher` struct and methods and unit-tests.
+    - `FsWatcher` struct would look similar to this:
+    ```go
+    type FsWatcher struct {
+        *fsnotify.Watcher
+
+        Events    chan struct{}
+        ratelimit time.Duration
+        names     []string
+        paths     map[string]struct{}
+    }
+    ```
+    - Implement the following functions:
+        - `CreateFsWatcher`: Instantiates a new `FsWatcher` and start watching on file system.
+        - `initWatcher`: Initializes the `fsnotify` watcher and initialize the `paths` that would be watched.
+        - `add`: Adds a new file to watch.
+        - `reset`: Re-initializes the `FsWatcher`.
+        - `watch`: watches for the configured files.
+- In the main function, we create a new `FsWatcher` and then we wait in an infinite loop to receive events indicating
+filesystem changes. Based on these changes, we re-execute `loadNannyConfiguration` function.
+
+> **Note:** The expected configuration file format is YAML. It has the same structure as the NannyConfiguration CRD.
+
+### Test Plan
+To ensure the proper functioning of the enhanced addon-resizer, the following test plan should be executed:
+1. **Unit Tests:** Write unit tests to validate the file watcher's functionality and ensure it triggers events when the configuration file changes.
+2. **Manual e2e Tests:** Deploy the addon-resizer with `BaseMemory` of `300Mi` and then we change the `BaseMemory` to `100Mi`. We should observer changes in the behavior of watched pod.
+
+
+[fsnotify]: https://github.com/fsnotify/fsnotify