fix(dashboards): Graph mem usage w and w/o cache (#1001)

Author: skl

dashboards/resources/node.libsonnet

@@ -175,7 +175,7 @@ local var = g.dashboard.variable;
           },
         ]),
 
-        tsPanel.new('Memory Usage (w/o cache)')
+        tsPanel.new('Memory Usage (w/cache)')
         + tsPanel.standardOptions.withUnit('bytes')
         + tsPanel.queryOptions.withTargets([
           prometheus.new(
@@ -202,6 +202,33 @@ local var = g.dashboard.variable;
           + fieldOverride.byName.withProperty('custom.lineStyle', { fill: 'dash', dash: [10, 10] }),
         ]),
 
+        tsPanel.new('Memory Usage (w/o cache)')
+        + tsPanel.standardOptions.withUnit('bytes')
+        + tsPanel.queryOptions.withTargets([
+          prometheus.new(
+            '${datasource}',
+            'sum(kube_node_status_capacity{%(clusterLabel)s="$cluster", %(kubeStateMetricsSelector)s, node=~"$node", resource="memory"})' % $._config,
+          )
+          + prometheus.withLegendFormat('max capacity'),
+
+          prometheus.new(
+            '${datasource}',
+            'sum(node_namespace_pod_container:container_memory_rss{%(clusterLabel)s="$cluster", node=~"$node", container!=""}) by (pod)' % $._config,
+          )
+          + prometheus.withLegendFormat('{{pod}}'),
+        ])
+        + tsPanel.fieldConfig.defaults.custom.withStacking({ mode: 'normal' })
+        + tsPanel.standardOptions.withOverrides([
+          fieldOverride.byName.new('max capacity')
+          + fieldOverride.byName.withPropertiesFromOptions(
+            timeSeries.standardOptions.color.withMode('fixed')
+            + timeSeries.standardOptions.color.withFixedColor('red')
+          )
+          + fieldOverride.byName.withProperty('custom.stacking', { mode: 'none' })
+          + fieldOverride.byName.withProperty('custom.hideFrom', { tooltip: true, viz: false, legend: false })
+          + fieldOverride.byName.withProperty('custom.lineStyle', { fill: 'dash', dash: [10, 10] }),
+        ]),
+
         table.new('Memory Quota')
         + table.standardOptions.withUnit('bytes')
         + table.queryOptions.withTargets([