From 69508a6e957d111d35305442084e0c1570930705 Mon Sep 17 00:00:00 2001
From: Aiden Grossman <aidengrossman@google.com>
Date: Sun, 12 Jan 2025 01:28:30 +0000
Subject: [PATCH] [CI] Add annotation to prevent eviction during node scale
 down

Because we are using GKE's autoscaling features, we need to ensure that either
the runner or workflow pod are marked with an annotation prevent scale down from
happening on the node. Otherwise GKE will decide that nodes actively running pods
should be scaled down rather than looking for empty nodes, with the idea being
that applications should be resilient against individual pods being killed,
which we are not.
---
 premerge/linux_runners_values.yaml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/premerge/linux_runners_values.yaml b/premerge/linux_runners_values.yaml
index 2af34c18..6c2e8b82 100644
--- a/premerge/linux_runners_values.yaml
+++ b/premerge/linux_runners_values.yaml
@@ -16,6 +16,9 @@ containerMode:
     annotations:
 
 template:
+  metadata:
+    annotations:
+      cluster-autoscaler.kubernetes.io/safe-to-evict: "false"
   spec:
     tolerations:
     - key: "premerge-platform"