From 7ed4d69c51f30bd21d90dc2b20418b82f08e32b2 Mon Sep 17 00:00:00 2001
From: Mayne0213 <bluemayne0213@icloud.com>
Date: Thu, 8 Jan 2026 18:48:09 +0900
Subject: [PATCH] PERF(alertmanager): add HA with 2 replicas

- Increase replicaCount from 1 to 2
- Add soft pod anti-affinity to spread across nodes
- Improve availability during node failures
---
 alertmanager/helm-values.yaml | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/alertmanager/helm-values.yaml b/alertmanager/helm-values.yaml
index 609445d..ce4d580 100644
--- a/alertmanager/helm-values.yaml
+++ b/alertmanager/helm-values.yaml
@@ -3,6 +3,19 @@
 
 fullnameOverride: alertmanager
 
+replicaCount: 2
+
+# Soft anti-affinity to spread pods across nodes
+affinity:
+  podAntiAffinity:
+    preferredDuringSchedulingIgnoredDuringExecution:
+      - weight: 100
+        podAffinityTerm:
+          labelSelector:
+            matchLabels:
+              app.kubernetes.io/name: alertmanager
+          topologyKey: kubernetes.io/hostname
+
 persistence:
   enabled: true
   size: 1Gi