diff --git a/monitoring/ceph-mixin/prometheus_alerts.yml b/monitoring/ceph-mixin/prometheus_alerts.yml
index fc38678f99d..578596f4af0 100644
--- a/monitoring/ceph-mixin/prometheus_alerts.yml
+++ b/monitoring/ceph-mixin/prometheus_alerts.yml
@@ -704,7 +704,18 @@ groups:
             rate of the past 48 hours.
 
       - alert: CephNodeInconsistentMTU
-        expr: node_network_mtu_bytes{device!="lo"} * (node_network_up{device!="lo"} > 0) != on() group_left() (quantile(0.5, node_network_mtu_bytes{device!="lo"}))
+        expr: |
+          node_network_mtu_bytes * (node_network_up{device!="lo"} > 0) ==
+            scalar(
+              max by (device) (node_network_mtu_bytes * (node_network_up{device!="lo"} > 0)) !=
+                quantile by (device) (.5, node_network_mtu_bytes * (node_network_up{device!="lo"} > 0))
+            )
+          or
+          node_network_mtu_bytes * (node_network_up{device!="lo"} > 0) ==
+            scalar(
+              min by (device) (node_network_mtu_bytes * (node_network_up{device!="lo"} > 0)) !=
+                quantile by (device) (.5, node_network_mtu_bytes * (node_network_up{device!="lo"} > 0))
+            )
         labels:
           severity: warning
           type: ceph_default
@@ -712,7 +723,7 @@ groups:
           summary: MTU settings across Ceph hosts are inconsistent
           description: >
             Node {{ $labels.instance }} has a different MTU size ({{ $value }})
-            than the median value on device {{ $labels.device }}.
+            than the median of devices named {{ $labels.device }}.
 
   - name: pools
     rules:
diff --git a/monitoring/ceph-mixin/tests_alerts/test_alerts.yml b/monitoring/ceph-mixin/tests_alerts/test_alerts.yml
index d7fe0132d2d..6ff221e7000 100644
--- a/monitoring/ceph-mixin/tests_alerts/test_alerts.yml
+++ b/monitoring/ceph-mixin/tests_alerts/test_alerts.yml
@@ -546,6 +546,12 @@ tests:
     - series: 'node_network_mtu_bytes{device="eth4",instance="node-exporter",
       job="node-exporter"}'
       values: '9000 9000 9000 9000 9000'
+    - series: 'node_network_mtu_bytes{device="eth4",instance="hostname1",
+      job="node-exporter"}'
+      values: '2200 2200 2200 2200 2200'
+    - series: 'node_network_mtu_bytes{device="eth4",instance="hostname2",
+      job="node-exporter"}'
+      values: '2400 2400 2400 2400 2400'
     - series: 'node_network_up{device="eth0",instance="node-exporter",
       job="node-exporter"}'
       values: '0 0 0 0 0'
@@ -557,21 +563,50 @@ tests:
       values: '1 1 1 1 1'
     - series: 'node_network_up{device="eth3",instance="node-exporter",
       job="node-exporter"}'
-      values: '0 0 0 0 0'
+      values: '1 1 1 1 1'
     - series: 'node_network_up{device="eth4",instance="node-exporter",
       job="node-exporter"}'
       values: '1 1 1 1 1'
+    - series: 'node_network_up{device="eth4",instance="hostname1",
+      job="node-exporter"}'
+      values: '1 1 1 1 1'
+    - series: 'node_network_up{device="eth4",instance="hostname2",
+      job="node-exporter"}'
+      values: '0 0 0 0 0'
    promql_expr_test:
-     - expr: node_network_mtu_bytes{device!="lo"} * (node_network_up{device!="lo"} > 0) != on() group_left()
-             (quantile(0.5, node_network_mtu_bytes{device!="lo"}))
+     - expr: |
+          node_network_mtu_bytes * (node_network_up{device!="lo"} > 0) ==
+            scalar(
+              max by (device) (node_network_mtu_bytes * (node_network_up{device!="lo"} > 0)) !=
+                quantile by (device) (.5, node_network_mtu_bytes * (node_network_up{device!="lo"} > 0))
+            )
+          or
+          node_network_mtu_bytes * (node_network_up{device!="lo"} > 0) ==
+            scalar(
+              min by (device) (node_network_mtu_bytes * (node_network_up{device!="lo"} > 0)) !=
+                quantile by (device) (.5, node_network_mtu_bytes * (node_network_up{device!="lo"} > 0))
+            )
        eval_time: 1m
        exp_samples:
          - labels: '{device="eth4", instance="node-exporter", job="node-exporter"}'
            value: 9000
+         - labels: '{device="eth4", instance="hostname1", job="node-exporter"}'
+           value: 2200
    alert_rule_test:
      - eval_time: 1m
        alertname: CephNodeInconsistentMTU
        exp_alerts:
+       - exp_labels:
+           device: eth4
+           instance: hostname1
+           job: node-exporter
+           severity: warning
+           type: ceph_default
+         exp_annotations:
+           summary: MTU settings across Ceph hosts are inconsistent
+           description: >
+               Node hostname1 has a different MTU size (2200)
+               than the median of devices named eth4.
        - exp_labels:
            device: eth4
            instance: node-exporter
@@ -582,7 +617,7 @@ tests:
            summary: MTU settings across Ceph hosts are inconsistent
            description: >
                Node node-exporter has a different MTU size (9000)
-               than the median value on device eth4.
+               than the median of devices named eth4.
 
  # pool full, data series has 6 but using topk(5) so to ensure the
  # results are working as expected