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feat: #2501 Count volumes attached to a node #2810

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feat: #2501 Count volumes attached to a node #2810

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a8648fd
#2501 Count volumes attached to a node
LiuQhahah Sep 23, 2024
08c753e
#2501 add documented
LiuQhahah Sep 23, 2024
7c129f1
Merge branch 'main' into #2501-Count-volumes-attached-to-a-node
LiuQhahah Nov 12, 2024
4810efd
Merge branch 'kubernetes:main' into #2501-Count-volumes-attached-to-a…
LiuQhahah Aug 27, 2025
e4b6971
fix: rename volume metrics to comply with Prometheus naming conventions
LiuQhahah Oct 15, 2025
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2 changes: 2 additions & 0 deletions docs/metrics/cluster/node-metrics.md
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Original file line number Diff line number Diff line change
Expand Up @@ -14,3 +14,5 @@
| kube_node_status_condition | Gauge | The condition of a cluster node | | `node`=&lt;node-address&gt; <br> `condition`=&lt;node-condition&gt; <br> `status`=&lt;true\|false\|unknown&gt; | STABLE |
| kube_node_created | Gauge | Unix creation timestamp | seconds | `node`=&lt;node-address&gt; | STABLE |
| kube_node_deletion_timestamp | Gauge | Unix deletion timestamp | seconds | `node`=&lt;node-address&gt; | EXPERIMENTAL |
| kube_node_volumes_in_use | Gauge | Number of volumes in use on the node | | `node`=&lt;node-address&gt; | STABLE |
| kube_node_volumes_attached | Gauge | Number of volumes attached to the node | | `node`=&lt;node-address&gt; | STABLE |
40 changes: 40 additions & 0 deletions internal/store/node.go
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,8 @@ func nodeMetricFamilies(allowAnnotationsList, allowLabelsList []string) []genera
createNodeStatusCapacityFamilyGenerator(),
createNodeStatusConditionFamilyGenerator(),
createNodeStateAddressFamilyGenerator(),
createNodeVolumeCountGenerator(),
createNodeVolumeInUseGenerator(),
}
}

Expand Down Expand Up @@ -506,6 +508,44 @@ func createNodeStatusConditionFamilyGenerator() generator.FamilyGenerator {
)
}

func createNodeVolumeCountGenerator() generator.FamilyGenerator {
return *generator.NewFamilyGeneratorWithStability(
"kube_node_volumes_attached",
"Number of volumes attached to the node",
metric.Gauge,
basemetrics.STABLE,
"",
wrapNodeFunc(func(n *v1.Node) *metric.Family {
return &metric.Family{
Metrics: []*metric.Metric{
{
Value: float64(len(n.Status.VolumesAttached)),
},
},
}
}),
)
}

func createNodeVolumeInUseGenerator() generator.FamilyGenerator {
return *generator.NewFamilyGeneratorWithStability(
"kube_node_volumes_in_use",
"Number of volumes in use on the node",
metric.Gauge,
basemetrics.STABLE,
"",
wrapNodeFunc(func(n *v1.Node) *metric.Family {
return &metric.Family{
Metrics: []*metric.Metric{
{
Value: float64(len(n.Status.VolumesInUse)),
},
},
}
}),
)
}

func wrapNodeFunc(f func(*v1.Node) *metric.Family) func(interface{}) *metric.Family {
return func(obj interface{}) *metric.Family {
node := obj.(*v1.Node)
Expand Down
37 changes: 37 additions & 0 deletions internal/store/node_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -386,6 +386,43 @@ func TestNodeStore(t *testing.T) {
"kube_node_created",
},
},
{
Obj: &v1.Node{
ObjectMeta: metav1.ObjectMeta{
Name: "127.0.0.1",
},
Status: v1.NodeStatus{
VolumesAttached: []v1.AttachedVolume{
{Name: "volume1", DevicePath: "/dev/sda1"},
{Name: "volume2", DevicePath: "/dev/sda2"},
},
},
},
Want: `
# HELP kube_node_volumes_attached [STABLE] Number of volumes attached to the node
# TYPE kube_node_volumes_attached gauge
kube_node_volumes_attached{node="127.0.0.1"} 2
`,
MetricNames: []string{"kube_node_volumes_attached"},
},
{
Obj: &v1.Node{
ObjectMeta: metav1.ObjectMeta{
Name: "127.0.0.1",
},
Status: v1.NodeStatus{
VolumesInUse: []v1.UniqueVolumeName{
"volume1",
},
},
},
Want: `
# HELP kube_node_volumes_in_use [STABLE] Number of volumes in use on the node
# TYPE kube_node_volumes_in_use gauge
kube_node_volumes_in_use{node="127.0.0.1"} 1
`,
MetricNames: []string{"kube_node_volumes_in_use"},
},
}
for i, c := range cases {
c.Func = generator.ComposeMetricGenFuncs(nodeMetricFamilies(nil, nil))
Expand Down
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