feat(grafana): override Jemalloc chart axis (#6984)

etc/grafana/dashboards/overview.json

@@ -8558,7 +8558,20 @@
           "unit": "decbytes",
           "unitScale": true
         },
-        "overrides": []
+        "overrides": [
+          {
+            "matcher": {
+              "id": "byName",
+              "options": "Retained"
+            },
+            "properties": [
+              {
+                "id": "custom.axisPlacement",
+                "value": "right"
+              }
+            ]
+          }
+        ]
       },
       "gridPos": {
         "h": 8,
@@ -9882,4 +9895,4 @@
   "uid": "2k8BXz24x",
   "version": 4,
   "weekStart": ""
-}
+}