diff --git a/config/clusters/2i2c/support.values.yaml b/config/clusters/2i2c/support.values.yaml
index 7c2222cc1a..4811af9493 100644
--- a/config/clusters/2i2c/support.values.yaml
+++ b/config/clusters/2i2c/support.values.yaml
@@ -7,6 +7,17 @@ prometheusStorageClass:
 
 prometheus:
   server:
+    defaultFlagsOverride:
+      - -c
+      - "rm -rvf /data/wal/* && \
+        exec /bin/prometheus \
+        --storage.tsdb.retention.time=732d \
+        --config.file=/etc/config/prometheus.yml \
+        --storage.tsdb.path=/data \
+        --web.console.libraries=/etc/prometheus/console_libraries \
+        --web.console.templates=/etc/prometheus/consoles \
+        --web.enable-lifecycle"
+    retention: 732d # Keep data for at least 2 year
     persistentVolume:
       # 100Gi filled up, and this is source of our billing data.
       size: 512Gi
diff --git a/helm-charts/support/values.yaml b/helm-charts/support/values.yaml
index 6451176f4b..8472f5d7ab 100644
--- a/helm-charts/support/values.yaml
+++ b/helm-charts/support/values.yaml
@@ -164,6 +164,8 @@ prometheus:
       - /bin/sh
     defaultFlagsOverride:
       - -c
+      # If changing this, please also find wherever this has been copied to and change
+      # those as well as appropriate
       - "rm -rvf /data/wal/* && \
         exec /bin/prometheus \
         --storage.tsdb.retention.time=366d \