Use only container label for mem usage query

flux2/config/monitoring/stackspin-alerts-prometheusrule.yaml

@@ -68,10 +68,10 @@ spec:
 
       # https://awesome-prometheus-alerts.grep.to/rules#rule-docker-containers-1-4
       - alert: ContainerMemoryUsage
-        expr: (sum(container_memory_working_set_bytes) BY (instance, name) / sum(container_spec_memory_limit_bytes > 0) BY (instance, name) * 100) > 80
+        expr: (sum(container_memory_working_set_bytes) BY (container) / sum(container_spec_memory_limit_bytes > 0) BY (container) * 100) > 80
         for: 2m
         labels:
           severity: warning
         annotations:
-          summary: Container Memory usage (instance {{ $labels.instance }})
+          summary: Container Memory usage ({{ $labels.container }})
           description: "Container Memory usage is above 80%\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"