diff --git a/helm_chart/HyperPodHelmChart/charts/health-monitoring-agent/templates/health-monitoring-agent.yaml b/helm_chart/HyperPodHelmChart/charts/health-monitoring-agent/templates/health-monitoring-agent.yaml
index 301548a0..2d5a430a 100644
--- a/helm_chart/HyperPodHelmChart/charts/health-monitoring-agent/templates/health-monitoring-agent.yaml
+++ b/helm_chart/HyperPodHelmChart/charts/health-monitoring-agent/templates/health-monitoring-agent.yaml
@@ -159,6 +159,7 @@ spec:
             - name: localtime
               mountPath: /etc/localtime
               readOnly: true
+      priorityClassName: {{ .Values.priorityClassName | default "system-node-critical" }}
       serviceAccountName: health-monitoring-agent
       volumes:
         - name: log
@@ -250,6 +251,7 @@ spec:
             - name: localtime
               mountPath: /etc/localtime
               readOnly: true
+      priorityClassName: {{ .Values.priorityClassName | default "system-node-critical" }}
       serviceAccountName: health-monitoring-agent
       volumes:
         - name: log
diff --git a/helm_chart/HyperPodHelmChart/charts/health-monitoring-agent/values.yaml b/helm_chart/HyperPodHelmChart/charts/health-monitoring-agent/values.yaml
index 5ead265e..c666b40a 100644
--- a/helm_chart/HyperPodHelmChart/charts/health-monitoring-agent/values.yaml
+++ b/helm_chart/HyperPodHelmChart/charts/health-monitoring-agent/values.yaml
@@ -30,3 +30,8 @@ hmaimage: ""
 
 # Enable debug output for region selection process
 debug: true
+
+# PriorityClass for the HMA DaemonSet pods.
+# system-node-critical ensures HMA is the last pod evicted under node pressure
+# (e.g. DiskPressure), preventing loss of health monitoring. See P438078245.
+priorityClassName: system-node-critical