diff --git a/ariadne/services/cluster_state.py b/ariadne/services/cluster_state.py
index 14a854a..a0920e9 100644
--- a/ariadne/services/cluster_state.py
+++ b/ariadne/services/cluster_state.py
@@ -18,6 +18,7 @@ logger = get_logger(__name__)
 _VALUE_PAIR_LEN = 2
 _RATE_WINDOW = "5m"
 _RESTARTS_WINDOW = "1h"
+_NODE_UNAME_LABEL = 'node_uname_info{nodename!=""}'
 _WORKLOAD_LABEL_KEYS = (
     "app.kubernetes.io/name",
     "app",
@@ -1162,22 +1163,22 @@ def _hottest_nodes(errors: list[str]) -> dict[str, Any]:
     try:
         hottest["cpu"] = _vm_topk(
             f'label_replace(topk(1, avg by (node) (((1 - avg by (instance) (rate(node_cpu_seconds_total{{mode="idle"}}[{_RATE_WINDOW}]))) * 100) '
-            '* on(instance) group_left(node) label_replace(node_uname_info{{nodename!=""}}, "node", "$1", "nodename", "(.*)"))), "__name__", "$1", "node", "(.*)")',
+            f'* on(instance) group_left(node) label_replace({_NODE_UNAME_LABEL}, "node", "$1", "nodename", "(.*)"))), "__name__", "$1", "node", "(.*)")',
             "node",
         )
         hottest["ram"] = _vm_topk(
-            'label_replace(topk(1, avg by (node) ((avg by (instance) ((node_memory_MemTotal_bytes - node_memory_MemAvailable_bytes) '
-            '/ node_memory_MemTotal_bytes * 100)) * on(instance) group_left(node) label_replace(node_uname_info{{nodename!=""}}, "node", "$1", "nodename", "(.*)"))), "__name__", "$1", "node", "(.*)")',
+            f'label_replace(topk(1, avg by (node) ((avg by (instance) ((node_memory_MemTotal_bytes - node_memory_MemAvailable_bytes) '
+            f'/ node_memory_MemTotal_bytes * 100)) * on(instance) group_left(node) label_replace({_NODE_UNAME_LABEL}, "node", "$1", "nodename", "(.*)"))), "__name__", "$1", "node", "(.*)")',
             "node",
         )
         hottest["net"] = _vm_topk(
             f'label_replace(topk(1, avg by (node) ((sum by (instance) (rate(node_network_receive_bytes_total{{device!~"lo"}}[{_RATE_WINDOW}]) '
-            f'+ rate(node_network_transmit_bytes_total{{device!~"lo"}}[{_RATE_WINDOW}]))) * on(instance) group_left(node) label_replace(node_uname_info{{nodename!=""}}, "node", "$1", "nodename", "(.*)"))), "__name__", "$1", "node", "(.*)")',
+            f'+ rate(node_network_transmit_bytes_total{{device!~"lo"}}[{_RATE_WINDOW}]))) * on(instance) group_left(node) label_replace({_NODE_UNAME_LABEL}, "node", "$1", "nodename", "(.*)"))), "__name__", "$1", "node", "(.*)")',
             "node",
         )
         hottest["io"] = _vm_topk(
             f'label_replace(topk(1, avg by (node) ((sum by (instance) (rate(node_disk_read_bytes_total[{_RATE_WINDOW}]) + rate(node_disk_written_bytes_total[{_RATE_WINDOW}]))) '
-            '* on(instance) group_left(node) label_replace(node_uname_info{{nodename!=""}}, "node", "$1", "nodename", "(.*)"))), "__name__", "$1", "node", "(.*)")',
+            f'* on(instance) group_left(node) label_replace({_NODE_UNAME_LABEL}, "node", "$1", "nodename", "(.*)"))), "__name__", "$1", "node", "(.*)")',
             "node",
         )
     except Exception as exc: