From 278e55b10a062a8ff4ebe27b76bb2c6f4ec5dc6b Mon Sep 17 00:00:00 2001
From: Devin Buhl <onedr0p@users.noreply.github.com>
Date: Thu, 13 Apr 2023 09:17:31 -0400
Subject: [PATCH] feat: Enable drift detection and oom watcher for helm
 controller

---
 kubernetes/flux/config/flux.yaml | 50 ++++++++++++++++++++++++++++++--
 1 file changed, 48 insertions(+), 2 deletions(-)

diff --git a/kubernetes/flux/config/flux.yaml b/kubernetes/flux/config/flux.yaml
index 140fe95d..c58ca7ee 100644
--- a/kubernetes/flux/config/flux.yaml
+++ b/kubernetes/flux/config/flux.yaml
@@ -24,6 +24,7 @@ spec:
     kind: OCIRepository
     name: flux-manifests
   patches:
+    # Remove the network policies that does not work with k3s
     - patch: |
         $patch: delete
         apiVersion: networking.k8s.io/v1
@@ -32,8 +33,9 @@ spec:
           name: not-used
       target:
         group: networking.k8s.io
-        version: v1
         kind: NetworkPolicy
+    # Increase the number of reconciliations that can be performed in parallel and bump the resources limits
+    # https://fluxcd.io/flux/cheatsheets/bootstrap/#increase-the-number-of-workers
     - patch: |
         - op: add
           path: /spec/template/spec/containers/0/args/-
@@ -49,4 +51,48 @@ spec:
           value: --requeue-dependency=5s
       target:
         kind: Deployment
-        name: "(kustomize-controller|helm-controller|source-controller)"
+        name: (kustomize-controller|helm-controller|source-controller)
+    - patch: |
+        apiVersion: apps/v1
+        kind: Deployment
+        metadata:
+          name: not-used
+        spec:
+          template:
+            spec:
+              containers:
+                - name: manager
+                  resources:
+                    limits:
+                      cpu: 2000m
+                      memory: 2Gi
+      target:
+        kind: Deployment
+        name: (kustomize-controller|helm-controller|source-controller)
+    # Enable drift detection for HelmReleases and set the log level to debug
+    # https://fluxcd.io/flux/components/helm/helmreleases/#drift-detection
+    - patch: |
+        - op: add
+          path: /spec/template/spec/containers/0/args/-
+          value: --feature-gates=DetectDrift=true,CorrectDrift=false
+        - op: add
+          path: /spec/template/spec/containers/0/args/-
+          value: --log-level=debug
+      target:
+        kind: Deployment
+        name: helm-controller
+    # Enable Helm near OOM detection
+    # https://fluxcd.io/flux/cheatsheets/bootstrap/#enable-helm-near-oom-detection
+    - patch: |
+        - op: add
+          path: /spec/template/spec/containers/0/args/-
+          value: --feature-gates=OOMWatch=true
+        - op: add
+          path: /spec/template/spec/containers/0/args/-
+          value: --oom-watch-memory-threshold=95
+        - op: add
+          path: /spec/template/spec/containers/0/args/-
+          value: --oom-watch-interval=500ms
+      target:
+        kind: Deployment
+        name: helm-controller