use container_memory_working_set_bytes instead

.nais/alerts.yaml

@@ -37,7 +37,7 @@ spec:
 
         # This alert checks if memory usage exceeds 90% of the 12GB limit, which could cause instability.
         - alert: HighMemoryUsage
-          expr: process_resident_memory_bytes{app="pseudo-service"} > (0.9 * on(namespace, pod) kube_pod_container_resource_limits_memory_bytes{pod=~"pseudo-service-.*"})
+          expr: sum by (namespace, pod) (container_memory_working_set_bytes{namespace="dapla-stat", pod=~"pseudo-service-.*"}) > 0.9 * sum by (namespace, pod) (kube_pod_container_resource_limits_memory_bytes{namespace="dapla-stat", pod=~"pseudo-service-.*"})
           for: 5m
           annotations:
             title: "High memory usage detected"