External metrics list

This document lists some of the metric types available from open-source projects and other external sources.

  • For a general explanation of the entries in the tables, including information about values like DELTA and GAUGE, see Metric types.

    To chart or monitor metric types with values of type STRING, you must use Monitoring Query Language (MQL), and you must convert the value into a numeric value. For information about MQL string-conversion methods, see String.

  • For information about the units used in the metric lists, see the unit field in the MetricDescriptor reference.

  • For information about statements of the form “Sampled every x seconds” and “After sampling, data is not visible for up to y seconds”, see Additional information: metadata.

  • The resource-hierarchy level tells you if the metric is written at the project, organization, or folder level(s). When the level is not specified in the metric descriptor, the metric writes at the project level by default.

  • For information about the meaning of launch stages such as GA (General Availability) and BETA (Preview), see Product launch stages.

external.googleapis.com

Metrics sent to Google Cloud projects with a metric type beginning external.googleapis.com are known as external metrics. The metrics are typically exported by open-source projects and third-party providers. There is presently a limit of 25,000 external metric descriptors per Google Cloud project.

Cloud Monitoring treats external metrics the same as custom metrics, with one exception. For external metrics, a resource_type of global is invalid and results in the metric data being discarded.

External metric descriptors that are created but then not used for at least 24 months are subject to deletion.

user

external.googleapis.com/user/ is a valid domain for user-defined metrics. It is functionally identical to custom.googleapis.com, although it has some backend optimizations that make queries perform better at scale. If you have many projects with identical metrics in every project, then you should use the external.googleapis.com/user/ prefix instead of custom.googleapis.com for performance reasons.

vmware/vcenter

Metrics whose names begin external.googleapis.com/vmware/vcenter/ come from Google Cloud VMware Engine environments that are running the standalone GCVE agent to collect and send metrics to Cloud Monitoring. For a list of metrics that the agent can collect, see List of collected metrics.

prometheus

Metrics whose names begin external.googleapis.com/prometheus/ come from Prometheus, an open-source monitoring tool often used with Kubernetes. When you configure Prometheus with Stackdriver Prometheus sidecar (deprecated), metrics exported by Prometheus are converted to Cloud Monitoring metric types with simple metric descriptors, such as the following:

{
  "name": "projects/my-gcp-project/metricDescriptors/external.googleapis.com/prometheus/apiserver_client_certificate_expiration_seconds",
  "metricKind": "CUMULATIVE",
  "valueType": "DISTRIBUTION",
  "description": "Auto-created custom metric.",
  "type": "external.googleapis.com/prometheus/apiserver_client_certificate_expiration_seconds"
}

If you are using the sidecar to ingest Prometheus metrics, then we recommend migrating to Google Cloud Managed Service for Prometheus.

Other metrics

Metrics from other domains.

The following list was last generated at 2025-10-23 15:30:31 UTC. For more information about this process, see About the lists.

cloudonefs

Metrics from Dell PowerScale for Google Cloud. Launch stages of these metrics: GA

The "metric type" strings in this table must be prefixed with cloudonefs.isiloncloud.com/. That prefix has been omitted from the entries in the table. When querying a label, use the metric.labels. prefix; for example, metric.labels.LABEL="VALUE".

Metric type Launch stage (Resource hierarchy levels)
Display name
Kind, Type, Unit
Monitored resources		 Description
Labels
cluster/operation_count GA  (project)
I/O operations
DELTA, INT64, count
dell_emc_cloud_onefs_cluster 		Count of the read/write operations performed on the cluster. Sampled every 60 seconds.
type: Type of operation.
cluster/received_bytes_count GA  (project)
Ingress network traffic
DELTA, INT64, By
dell_emc_cloud_onefs_cluster 		Total ingress traffic associated to the cluster in bytes. Sampled every 60 seconds.
cluster/sent_bytes_count GA  (project)
Egress network traffic
DELTA, INT64, By
dell_emc_cloud_onefs_cluster 		Total egress traffic associated to the cluster in bytes. Sampled every 60 seconds.
cluster/total_bytes GA  (project)
Storage capacity allocated
GAUGE, INT64, By
dell_emc_cloud_onefs_cluster 		Total capacity allocated to the cluster, in bytes. Sampled every 60 seconds.
cluster/used_bytes GA  (project)
Storage usage
GAUGE, INT64, By
dell_emc_cloud_onefs_cluster 		Total storage space used by the cluster in bytes. Sampled every 60 seconds.

cloudvolumesgcp-api.netapp.com

Metrics from NetApp Cloud Volumes. Launch stages of these metrics: BETA

The "metric type" strings in this table must be prefixed with cloudvolumesgcp-api.netapp.com/. That prefix has been omitted from the entries in the table. When querying a label, use the metric.labels. prefix; for example, metric.labels.LABEL="VALUE".

Metric type Launch stage (Resource hierarchy levels)
Display name
Kind, Type, Unit
Monitored resources		 Description
Labels
cloudvolume/inode_allocation BETA  (project)
Volume inode allocation
GAUGE, INT64, 1
cloudvolumesgcp-api.netapp.com/CloudVolume 		Inodes allocated for the volume (hard cap). Tied to allocated capacity (size) of volume.
cloudvolume/inode_usage BETA  (project)
Volume inode usage
GAUGE, INT64, 1
cloudvolumesgcp-api.netapp.com/CloudVolume 		Number of inodes in use on the volume.
cloudvolume/logical_bytes_backed_up BETA  (project)
Logical bytes backed up
GAUGE, INT64, By
cloudvolumesgcp-api.netapp.com/CloudVolume 		Logical bytes backed up (baseline and incremental changes).
cloudvolume/operation_count BETA  (project)
Operations count
DELTA, INT64, 1
cloudvolumesgcp-api.netapp.com/CloudVolume 		Number of operations being performed on the cloud volume by the end users.
type: Type of operation, read, write, or metadata.
cloudvolume/read_bytes_count BETA  (project)
Bytes read
DELTA, INT64, By
cloudvolumesgcp-api.netapp.com/CloudVolume 		I/O bytes from read operations by the end user.
cloudvolume/replication_healthy BETA  (project)
Volume Replication Healthy
GAUGE, INT64, 1
cloudvolumesgcp-api.netapp.com/CloudVolume 		Values of TRUE for healthy and FALSE for unhealthy replication relationship.
cloudvolume/replication_lag_time BETA  (project)
Volume Replication Transfer Lag Time
GAUGE, INT64, sec
cloudvolumesgcp-api.netapp.com/CloudVolume 		Elapsed time since the exported snapshot copy (last complete transfer) was created on the destination.
cloudvolume/replication_last_transfer_duration BETA  (project)
Volume Replication Last Transfer Duration
GAUGE, INT64, sec
cloudvolumesgcp-api.netapp.com/CloudVolume 		Duration of the last transfer job.
cloudvolume/replication_last_transfer_size BETA  (project)
Volume Replication Last Transfer Size
GAUGE, INT64, By
cloudvolumesgcp-api.netapp.com/CloudVolume 		Size of the last transfer job.
cloudvolume/replication_relationship_progress BETA  (project)
Volume Replication Transfer Progress
CUMULATIVE, INT64, By
cloudvolumesgcp-api.netapp.com/CloudVolume 		Amount of data transferred thus far for the current job.
cloudvolume/replication_relationship_status BETA  (project)
Volume Replication Status
GAUGE, INT64, 1
cloudvolumesgcp-api.netapp.com/CloudVolume 		Status of replication: TRUE = transferring, FALSE = idle.
cloudvolume/replication_total_transfer_bytes BETA  (project)
Volume Replication Total Transfer Bytes
CUMULATIVE, INT64, By
cloudvolumesgcp-api.netapp.com/CloudVolume 		Cumulative data transferred for the relationship since it was created.
cloudvolume/request_latencies BETA  (project)
Volume IO operation latency
DELTA, DISTRIBUTION, ms
cloudvolumesgcp-api.netapp.com/CloudVolume 		Distribution of IO operation request latencies, in milliseconds.
method: Type of latency, read or write.
cloudvolume/volume_percent_used BETA  (project)
Volume percentage used
GAUGE, INT64, %
cloudvolumesgcp-api.netapp.com/CloudVolume 		Percent of volume allocated space used.
cloudvolume/volume_size BETA  (project)
Volume space allocation
GAUGE, INT64, By
cloudvolumesgcp-api.netapp.com/CloudVolume 		Space allocated to the volume, in bytes. A measure of the actual provisioned size of the volume.
cloudvolume/volume_usage BETA  (project)
Volume space usage
GAUGE, INT64, By
cloudvolumesgcp-api.netapp.com/CloudVolume 		Space utilized by the volume, in bytes. A measure of the actual size of the volume.
type: Type of usage, logical or snapshot.
cloudvolume/write_bytes_count BETA  (project)
Bytes written
DELTA, INT64, By
cloudvolumesgcp-api.netapp.com/CloudVolume 		I/O bytes from write operations by the end user.
cloudvolumepool/size BETA  (project)
Storage pool space allocation
GAUGE, INT64, By
cloudvolumesgcp-api.netapp.com/CloudVolumePool 		Space allocated to the pool, in bytes.
cloudvolumepool/usage BETA  (project)
Storage pool space usage
GAUGE, INT64, By
cloudvolumesgcp-api.netapp.com/CloudVolumePool 		Space used by all the volumes in the storage pool, in bytes.

netapp.com

Metrics from NetApp.

The "metric type" strings in this table must be prefixed with netapp.com/. That prefix has been omitted from the entries in the table. When querying a label, use the metric.labels. prefix; for example, metric.labels.LABEL="VALUE".

Metric type Launch stage (Resource hierarchy levels)
Display name
Kind, Type, Unit
Monitored resources		 Description
Labels
cloudvolume/inode_allocation DEPRECATED  (project)
Volume inode allocation
GAUGE, INT64, {inode}
netapp_cloud_volume 		Inode allocated for the volume (hard cap). Tied to allocated capacity (size) of volume. Sampled every 300 seconds.
cloudvolume/inode_usage DEPRECATED  (project)
Volume inode usage
GAUGE, INT64, {inode}
netapp_cloud_volume 		Number of inode in use on the volume. Sampled every 300 seconds.
type: Type of usage, either logical or snapshot.
cloudvolume/operation_count DEPRECATED  (project)
Operations count
DELTA, INT64, count
netapp_cloud_volume 		Number of operations being performed on the cloud volume by the end users. Sampled every 60 seconds.
type: Type of utilization, either logical or snapshot.
cloudvolume/read_bytes_count DEPRECATED  (project)
Bytes read
DELTA, INT64, By
netapp_cloud_volume 		I/O bytes from read operations by the end user. Sampled every 60 seconds.
cloudvolume/request_latencies DEPRECATED  (project)
Volume IO operation latency
DELTA, DISTRIBUTION, ms
netapp_cloud_volume 		Distribution of IO operation request latencies, in milliseconds. A measure of responsiveness of the volume. Sampled every 60 seconds.
method: NetApp Cloud Volume IO operation.
cloudvolume/volume_size DEPRECATED  (project)
Volume space allocation
GAUGE, INT64, By
netapp_cloud_volume 		Space allocated to the volume, in bytes. A measure of the actual provisioned size of the volume. Sampled every 60 seconds.
cloudvolume/volume_usage DEPRECATED  (project)
Volume space usage
GAUGE, INT64, By
netapp_cloud_volume 		Space utilized by the volume, in bytes. A measure of the actual size of the volume. Sampled every 60 seconds.
type: Type of usage, either logical or snapshot.
cloudvolume/write_bytes_count DEPRECATED  (project)
Bytes written
DELTA, INT64, By
netapp_cloud_volume 		I/O bytes from write operations by the end user. Sampled every 60 seconds.

Generated at 2025-10-23 15:30:31 UTC.