Browsing metric and resource types

This document explains how to use the Cloud Monitoring API to get lists or descriptions of the following:

  • Custom metric types defined in your project.
  • Third-party metric types with time-series data in your project. Metrics generated by BindPlane are examples of third-party metrics. BindPlane metrics have a prefix of external.googleapis.com/bluemedora/generic_node/.
  • Built-in metric types provided by Google Cloud. These metric types can help you design your custom metrics. You can also find information about these metrics in the documentation; see Metrics list.
  • Monitored resource types available to your project. You can also find information about these resources in the documentation; see Monitored resource list.

There are several ways to use the API methods that this page describes:

  • To run the methods without writing any code, the examples in the Protocol tabs on this page use the forms-based APIs Explorer. (See APIs Explorer for more information on this tool.)

  • To learn how to use the methods from selected programming languages, see the runnable code samples on this page.

Before you begin

List metric descriptors

Metric descriptors are the schemas that define metrics. To find details about the metrics you're interested in, browse the available metric descriptors:

  • Built-in metrics: You can issue API requests to any existing project, or you can use Metrics lists documentation.
  • Custom and external metrics: You must issue the API request to a project where the custom metric is defined or where time-series data for the metric exists.

For more information on how metric types are named, see Naming conventions.

List metric types

To get a current list of metric descriptors, use the metricDescriptors.list method. To narrow the set of metric types that are returned, use a filter. For help deciding which metric types to search for, see Value types and metric kinds.

Protocol

The following are sample parameters to metricDescriptors.list for returning Compute Engine metrics:

  • name: projects/PROJECT_ID
  • filter: metric.type = starts_with("compute.googleapis.com")

Try It!

Before clicking the Execute button, change PROJECT_ID to a valid ID.

The following sample output shows two of the many Compute Engine metrics that match the filter:

    "metricDescriptors": [
      {
        "name": "projects/PROJECT_ID/metricDescriptors/compute.googleapis.com/firewall/dropped_bytes_count",
        "labels": [{...}],
         ...
         "description": "Count of incoming bytes dropped by the firewall.",
         "displayName": "Dropped bytes",
         "type": "compute.googleapis.com/firewall/dropped_bytes_count",
         ...
      },
      {
         "name": "projects/PROJECT_ID/metricDescriptors/compute.googleapis.com/firewall/dropped_packets_count",
         "labels": [{...}],
         ...
         "description": "Count of incoming packets dropped by the firewall.",
         "displayName": "Dropped packets",
         "type": "compute.googleapis.com/firewall/dropped_packets_count",
      },
      ...
    ]

The type value here identifies the metric descriptor, for example, compute.googleapis.com/firewall/dropped_packets_count. This value is sometimes also called the “metric type” or the “metric type name”.

C#

public static object ListMetrics(string projectId)
{
    MetricServiceClient client = MetricServiceClient.Create();
    ProjectName projectName = new ProjectName(projectId);
    PagedEnumerable<ListMetricDescriptorsResponse, MetricDescriptor> metrics = client.ListMetricDescriptors(projectName);
    foreach (MetricDescriptor metric in metrics)
    {
        Console.WriteLine($"{metric.Name}: {metric.DisplayName}");
    }
    return 0;
}

Go


import (
	"context"
	"fmt"
	"io"

	monitoring "cloud.google.com/go/monitoring/apiv3"
	"google.golang.org/api/iterator"
	monitoringpb "google.golang.org/genproto/googleapis/monitoring/v3"
)

// listMetrics lists all the metrics available to be monitored in the API.
func listMetrics(w io.Writer, projectID string) error {
	ctx := context.Background()
	c, err := monitoring.NewMetricClient(ctx)
	if err != nil {
		return err
	}
	defer c.Close()

	req := &monitoringpb.ListMetricDescriptorsRequest{
		Name: "projects/" + projectID,
	}
	iter := c.ListMetricDescriptors(ctx, req)

	for {
		resp, err := iter.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return fmt.Errorf("Could not list metrics: %v", err)
		}
		fmt.Fprintf(w, "%v\n", resp.GetType())
	}
	fmt.Fprintln(w, "Done")
	return nil
}

Java

// Your Google Cloud Platform project ID
String projectId = System.getProperty("projectId");

final MetricServiceClient client = MetricServiceClient.create();
ProjectName name = ProjectName.of(projectId);

ListMetricDescriptorsRequest request =
    ListMetricDescriptorsRequest.newBuilder().setName(name.toString()).build();
ListMetricDescriptorsPagedResponse response = client.listMetricDescriptors(request);

System.out.println("Listing descriptors: ");

for (MetricDescriptor d : response.iterateAll()) {
  System.out.println(d.getName() + " " + d.getDisplayName());
}

Node.js

// Imports the Google Cloud client library
const monitoring = require('@google-cloud/monitoring');

// Creates a client
const client = new monitoring.MetricServiceClient();

/**
 * TODO(developer): Uncomment and edit the following lines of code.
 */
// const projectId = 'YOUR_PROJECT_ID';

const request = {
  name: client.projectPath(projectId),
};

// Lists metric descriptors
const [descriptors] = await client.listMetricDescriptors(request);
console.log('Metric Descriptors:');
descriptors.forEach(descriptor => console.log(descriptor.name));

PHP

use Google\Cloud\Monitoring\V3\MetricServiceClient;

/**
 * Example:
 * ```
 * list_descriptors($projectId);
 * ```
 *
 * @param string $projectId Your project ID
 */
function list_descriptors($projectId)
{
    $metrics = new MetricServiceClient([
        'projectId' => $projectId,
    ]);

    $projectName = $metrics->projectName($projectId);
    $descriptors = $metrics->listMetricDescriptors($projectName);

    printf('Metric Descriptors:' . PHP_EOL);
    foreach ($descriptors->iterateAllElements() as $descriptor) {
        printf($descriptor->getName() . PHP_EOL);
    }
}

Python

client = monitoring_v3.MetricServiceClient()
project_name = f"projects/{project_id}"
for descriptor in client.list_metric_descriptors(name=project_name):
    print(descriptor.type)

Ruby

# Your Google Cloud Platform project ID
# project_id = "YOUR_PROJECT_ID"

client = Google::Cloud::Monitoring.metric_service
project_name = client.project_path project: project_id

results = client.list_metric_descriptors name: project_name
results.each do |descriptor|
  p descriptor.type
end

If you have difficulty, see Troubleshooting API calls.

Get metric descriptors

To get information about a specific metric type, use the metricDescriptors.get method. This method returns a metric descriptor.

To retrieve a specific metric descriptor, you must provide the full name of the metric to the API. The full name is constructed from two components:

  • A prefix consisting of projects/PROJECT_ID/metricDescriptors.
  • The type value that identifies the metric descriptor, for example, compute.googleapis.com/firewall/dropped_packets_count. See the Protocol tab in List metric types for more on the type value.

The following is an example of the full name of a metric:

projects/PROJECT_ID/metricDescriptors/compute.googleapis.com/firewall/dropped_packets_count

Protocol

To get the details of Compute Engine's /firewall/dropped_packets_count metric, use the following parameter to metricDescriptors.get:

  • name: projects/PROJECT_ID/metricDescriptors/compute.googleapis.com/firewall/dropped_packets_count

Try It!

Before clicking the Execute button, change PROJECT_ID to a valid ID.

The following sample response shows the metric's descriptor:

    {
        "name": "projects/PROJECT_ID/metricDescriptors/compute.googleapis.com/firewall/dropped_packets_count",
        "labels": [
          {
            "key": "instance_name",
            "description": "The name of the VM instance."
          }
        ],
        "metricKind": "DELTA",
        "valueType": "INT64",
        "unit": "1",
        "description": "Count of incoming packets dropped by the firewall.",
        "displayName": "Dropped packets",
        "type": "compute.googleapis.com/firewall/dropped_packets_count",
      }

C#

public static object GetMetricDetails(string projectId, string metricType)
{
    MetricServiceClient client = MetricServiceClient.Create();
    MetricDescriptorName name = new MetricDescriptorName(projectId, metricType);
    try
    {
        var response = client.GetMetricDescriptor(name);
        string metric = JObject.Parse($"{response}").ToString();
        Console.WriteLine($"{ metric }");
    }
    catch (Grpc.Core.RpcException ex)
        when (ex.Status.StatusCode == Grpc.Core.StatusCode.NotFound)
    { }
    return 0;
}

Go


import (
	"context"
	"fmt"
	"io"

	monitoring "cloud.google.com/go/monitoring/apiv3"
	monitoringpb "google.golang.org/genproto/googleapis/monitoring/v3"
)

// getMetricDescriptor gets the descriptor for the given metricType and prints
// information about it. metricType is the type of the metric, for example
// compute.googleapis.com/firewall/dropped_packets_count.
func getMetricDescriptor(w io.Writer, projectID, metricType string) error {
	ctx := context.Background()
	c, err := monitoring.NewMetricClient(ctx)
	if err != nil {
		return fmt.Errorf("NewMetricClient: %v", err)
	}
	defer c.Close()
	req := &monitoringpb.GetMetricDescriptorRequest{
		Name: fmt.Sprintf("projects/%s/metricDescriptors/%s", projectID, metricType),
	}
	resp, err := c.GetMetricDescriptor(ctx, req)
	if err != nil {
		return fmt.Errorf("could not get custom metric: %v", err)
	}

	fmt.Fprintf(w, "Name: %v\n", resp.GetName())
	fmt.Fprintf(w, "Description: %v\n", resp.GetDescription())
	fmt.Fprintf(w, "Type: %v\n", resp.GetType())
	fmt.Fprintf(w, "Metric Kind: %v\n", resp.GetMetricKind())
	fmt.Fprintf(w, "Value Type: %v\n", resp.GetValueType())
	fmt.Fprintf(w, "Unit: %v\n", resp.GetUnit())
	fmt.Fprintf(w, "Labels:\n")
	for _, l := range resp.GetLabels() {
		fmt.Fprintf(w, "\t%s (%s) - %s", l.GetKey(), l.GetValueType(), l.GetDescription())
	}
	return nil
}

Java

// Your Google Cloud Platform project ID
String projectId = System.getProperty("projectId");

final MetricServiceClient client = MetricServiceClient.create();
MonitoredResourceDescriptorName name = MonitoredResourceDescriptorName.of(projectId, type);
MonitoredResourceDescriptor response = client.getMonitoredResourceDescriptor(name);

System.out.println("Printing monitored resource descriptor: ");
System.out.println(response);

Node.js

// Imports the Google Cloud client library
const monitoring = require('@google-cloud/monitoring');

// Creates a client
const client = new monitoring.MetricServiceClient();

/**
 * TODO(developer): Uncomment and edit the following lines of code.
 */
// const projectId = 'YOUR_PROJECT_ID';
// const metricId = 'custom.googleapis.com/your/id';

const request = {
  name: client.projectMetricDescriptorPath(projectId, metricId),
};

// Retrieves a metric descriptor
const [descriptor] = await client.getMetricDescriptor(request);
console.log(`Name: ${descriptor.displayName}`);
console.log(`Description: ${descriptor.description}`);
console.log(`Type: ${descriptor.type}`);
console.log(`Kind: ${descriptor.metricKind}`);
console.log(`Value Type: ${descriptor.valueType}`);
console.log(`Unit: ${descriptor.unit}`);
console.log('Labels:');
descriptor.labels.forEach(label => {
  console.log(`  ${label.key} (${label.valueType}) - ${label.description}`);
});

PHP

use Google\Cloud\Monitoring\V3\MetricServiceClient;

/**
 * Example:
 * ```
 * get_descriptor($projectId);
 * ```
 *
 * @param string $projectId Your project ID
 * @param string $metricId  The ID of the Metric Descriptor to get
 */
function get_descriptor($projectId, $metricId)
{
    $metrics = new MetricServiceClient([
        'projectId' => $projectId,
    ]);

    $metricName = $metrics->metricDescriptorName($projectId, $metricId);
    $descriptor = $metrics->getMetricDescriptor($metricName);

    printf('Name: ' . $descriptor->getDisplayName() . PHP_EOL);
    printf('Description: ' . $descriptor->getDescription() . PHP_EOL);
    printf('Type: ' . $descriptor->getType() . PHP_EOL);
    printf('Metric Kind: ' . $descriptor->getMetricKind() . PHP_EOL);
    printf('Value Type: ' . $descriptor->getValueType() . PHP_EOL);
    printf('Unit: ' . $descriptor->getUnit() . PHP_EOL);
    printf('Labels:' . PHP_EOL);
    foreach ($descriptor->getLabels() as $labels) {
        printf('  %s (%s) - %s' . PHP_EOL,
            $labels->getKey(),
            $labels->getValueType(),
            $labels->getDescription());
    }
}

Python

client = monitoring_v3.MetricServiceClient()
descriptor = client.get_metric_descriptor(name=metric_name)
pprint.pprint(descriptor)

Ruby

# Your Google Cloud Platform project ID
# project_id = "YOUR_PROJECT_ID"

# Example metric type
# metric_type = "custom.googleapis.com/my_metric"

client = Google::Cloud::Monitoring.metric_service
metric_name = client.metric_descriptor_path project:           project_id,
                                            metric_descriptor: metric_type

descriptor = client.get_metric_descriptor name: metric_name
p descriptor

If you have difficulty, see Troubleshooting API calls.

List monitored resources

Monitored resources are cloud entities that can be monitored. To find the kinds of entities that have metrics, browse the list of monitored resource types.

To get information about monitored resources, you can issue API requests to any existing project, or you can use the Monitored resource list documentation.

List resource types

To get a current list of monitored resource types from the Monitoring API, use the monitoredResourceDescriptors.list method and supply your project ID.

Protocol

To get a current list of monitored resource types, use monitoredResourceDescriptors.list with the following sample parameters:

  • name: projects/PROJECT_ID

Try It!

Before clicking the Execute button, change PROJECT_ID to a valid ID.

The following sample response shows some of the returned monitored resource types:

    {
    "resourceDescriptors": [
    {
      "type": "aiplatform.googleapis.com/Endpoint",
      "displayName": "AI Platform Endpoint",
      "description": "A Cloud AI Platform API Endpoint where Models are deployed into it.",
      "labels": [{...}],
      "name": "projects/PROJECT_ID/monitoredResourceDescriptors/aiplatform.googleapis.com/Endpoint",
    },
    {
      "type": "aiplatform.googleapis.com/Featurestore",
      "displayName": "AI Platform Feature Store",
      "description": "A Cloud AI Platform Feature Store.",
      "labels": [{...}],
      "name": "projects/PROJECT_ID/monitoredResourceDescriptors/aiplatform.googleapis.com/Featurestore",
    },

C#

        public static object ListMonitoredResources(string projectId)
        {
            Console.WriteLine("Starting to List Monitored Resources...");
            MetricServiceClient client = MetricServiceClient.Create();
            ProjectName projectName = new ProjectName(projectId);

            PagedEnumerable<ListMonitoredResourceDescriptorsResponse, MonitoredResourceDescriptor>
                resources = client.ListMonitoredResourceDescriptors(projectName);
            if (resources != null)
            {
                foreach (MonitoredResourceDescriptor resource in resources.Take(10))
                {
                    Console.WriteLine($"{resource.Name}: {resource.DisplayName}");
                }
            }
            else { Console.WriteLine("No resources found."); }
            return 0;
        }

Go


import (
	"context"
	"fmt"
	"io"

	monitoring "cloud.google.com/go/monitoring/apiv3"
	"google.golang.org/api/iterator"
	monitoringpb "google.golang.org/genproto/googleapis/monitoring/v3"
)

// listMonitoredResources lists all the resources available to be monitored.
func listMonitoredResources(w io.Writer, projectID string) error {
	ctx := context.Background()
	c, err := monitoring.NewMetricClient(ctx)
	if err != nil {
		return err
	}
	defer c.Close()

	req := &monitoringpb.ListMonitoredResourceDescriptorsRequest{
		Name: "projects/" + projectID,
	}
	iter := c.ListMonitoredResourceDescriptors(ctx, req)

	for {
		resp, err := iter.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return fmt.Errorf("Could not list time series: %v", err)
		}
		fmt.Fprintf(w, "%v\n", resp)
	}
	fmt.Fprintln(w, "Done")
	return nil
}

Java

// Your Google Cloud Platform project ID
String projectId = System.getProperty("projectId");

final MetricServiceClient client = MetricServiceClient.create();
ProjectName name = ProjectName.of(projectId);

ListMonitoredResourceDescriptorsRequest request =
    ListMonitoredResourceDescriptorsRequest.newBuilder().setName(name.toString()).build();

System.out.println("Listing monitored resource descriptors: ");

ListMonitoredResourceDescriptorsPagedResponse response =
    client.listMonitoredResourceDescriptors(request);

for (MonitoredResourceDescriptor d : response.iterateAll()) {
  System.out.println(d.getType());
}

Node.js

// Imports the Google Cloud client library
const monitoring = require('@google-cloud/monitoring');

// Creates a client
const client = new monitoring.MetricServiceClient();

/**
 * TODO(developer): Uncomment and edit the following lines of code.
 */
// const projectId = 'YOUR_PROJECT_ID';

const request = {
  name: client.projectPath(projectId),
};

// Lists monitored resource descriptors
const [descriptors] = await client.listMonitoredResourceDescriptors(request);
console.log('Monitored Resource Descriptors:');
descriptors.forEach(descriptor => {
  console.log(descriptor.name);
  console.log(`  Type: ${descriptor.type}`);
  if (descriptor.labels) {
    console.log('  Labels:');
    descriptor.labels.forEach(label => {
      console.log(
        `    ${label.key} (${label.valueType}): ${label.description}`
      );
    });
  }
  console.log();
});

PHP

use Google\Cloud\Monitoring\V3\MetricServiceClient;

/**
 * Example:
 * ```
 * list_resources('your-project-id');
 * ```
 *
 * @param string $projectId Your project ID
 */
function list_resources($projectId)
{
    $metrics = new MetricServiceClient([
        'projectId' => $projectId,
    ]);
    $projectName = $metrics->projectName($projectId);
    $descriptors = $metrics->listMonitoredResourceDescriptors($projectName);
    foreach ($descriptors->iterateAllElements() as $descriptor) {
        print($descriptor->getType() . PHP_EOL);
    }
}

Python

client = monitoring_v3.MetricServiceClient()
project_name = f"projects/{project_id}"
resource_descriptors = client.list_monitored_resource_descriptors(name=project_name)
for descriptor in resource_descriptors:
    print(descriptor.type)

Ruby

# Your Google Cloud Platform project ID
# project_id = "YOUR_PROJECT_ID"

client = Google::Cloud::Monitoring.metric_service
project_name = client.project_path project: project_id

results = client.list_monitored_resource_descriptors name: project_name
results.each do |descriptor|
  p descriptor.type
end

If you have difficulty, see Troubleshooting API calls.

Getting resource descriptors

To get details about a specific monitored-resource type, use the monitoredResourceDescriptors.get method.

To retrieve a specific monitored-resource descriptor, you must provide the full name of the descriptor to the API. The full name is constructed from two components:

  • A prefix consisting of projects/PROJECT_ID/monitoredResourceDescriptors.
  • The type value that identifies the monitored-resource descriptor, for example, gce_instance. See the Protocol tab in List resource types for more on the type value.

The following is an example of the full name of a monitored resource:

projects/PROJECT_ID/monitoredResourceDescriptors/gce_instance

Protocol

To get the details of the gce_instance resource type, use the following parameter to monitoredResourceDescriptors.get method:

  • name: projects/PROJECT_ID/monitoredResourceDescriptors/gce_instance

Try It!

Before clicking the Execute button, change PROJECT_ID to a valid ID.

The following sample response shows the descriptor for this monitored resource:

    {
      "type": "gce_instance",
      "displayName": "VM Instance",
      "description": "A virtual machine instance hosted in Compute Engine.",
      "labels": [
        {
          "key": "project_id",
          "description": "The identifier of the GCP project associated with this resource, such as \"my-project\"."
        },
        {
          "key": "instance_id",
          "description": "The numeric VM instance identifier assigned by Compute Engine."
        },
        {
          "key": "zone",
          "description": "The Compute Engine zone in which the VM is running."
        }
      ],
      "name": "projects/PROJECT_ID/monitoredResourceDescriptors/gce_instance"
    }

C#

public static object GetMonitoredResource(string projectId, string resourceId)
{
    MetricServiceClient client = MetricServiceClient.Create();
    MonitoredResourceDescriptorName name = new MonitoredResourceDescriptorName(projectId, resourceId);
    var response = client.GetMonitoredResourceDescriptor(name);
    string resource = JObject.Parse($"{response}").ToString();
    Console.WriteLine($"{ resource }");
    return 0;
}

Go


import (
	"context"
	"fmt"
	"io"

	monitoring "cloud.google.com/go/monitoring/apiv3"
	monitoringpb "google.golang.org/genproto/googleapis/monitoring/v3"
)

// getMonitoredResource gets the descriptor for the given resourceType and
// prints information about it. resource should be of the form
// "projects/[PROJECT_ID]/monitoredResourceDescriptors/[RESOURCE_TYPE]".
func getMonitoredResource(w io.Writer, resource string) error {
	ctx := context.Background()
	c, err := monitoring.NewMetricClient(ctx)
	if err != nil {
		return fmt.Errorf("NewMetricClient: %v", err)
	}
	defer c.Close()
	req := &monitoringpb.GetMonitoredResourceDescriptorRequest{
		Name: fmt.Sprintf(resource),
	}
	resp, err := c.GetMonitoredResourceDescriptor(ctx, req)
	if err != nil {
		return fmt.Errorf("could not get custom metric: %v", err)
	}

	fmt.Fprintf(w, "Name: %v\n", resp.GetName())
	fmt.Fprintf(w, "Description: %v\n", resp.GetDescription())
	fmt.Fprintf(w, "Type: %v\n", resp.GetType())
	fmt.Fprintf(w, "Labels:\n")
	for _, l := range resp.GetLabels() {
		fmt.Fprintf(w, "\t%s (%s) - %s", l.GetKey(), l.GetValueType(), l.GetDescription())
	}
	return nil
}

Java

void getMonitoredResource(String resourceId) throws IOException {
  String projectId = System.getProperty("projectId");
  MetricServiceClient client = MetricServiceClient.create();
  MonitoredResourceDescriptorName name =
      MonitoredResourceDescriptorName.of(projectId, resourceId);
  MonitoredResourceDescriptor response = client.getMonitoredResourceDescriptor(name);
  System.out.println("Retrieved Monitored Resource: " + gson.toJson(response));
}

Node.js

// Imports the Google Cloud client library
const monitoring = require('@google-cloud/monitoring');

// Creates a client
const client = new monitoring.MetricServiceClient();

/**
 * TODO(developer): Uncomment and edit the following lines of code.
 */
// const projectId = 'YOUR_PROJECT_ID';
// const resourceType = 'some_resource_type, e.g. cloudsql_database';

const request = {
  name: client.projectMonitoredResourceDescriptorPath(
    projectId,
    resourceType
  ),
};

// Lists monitored resource descriptors
const [descriptor] = await client.getMonitoredResourceDescriptor(request);

console.log(`Name: ${descriptor.displayName}`);
console.log(`Description: ${descriptor.description}`);
console.log(`Type: ${descriptor.type}`);
console.log('Labels:');
descriptor.labels.forEach(label => {
  console.log(`  ${label.key} (${label.valueType}) - ${label.description}`);
});

PHP

use Google\Cloud\Monitoring\V3\MetricServiceClient;

/**
 * Example:
 * ```
 * get_resource('your-project-id', 'gcs_bucket');
 * ```
 *
 * @param string $projectId Your project ID
 * @param string $resourceType The resource type of the monitored resource.
 */
function get_resource($projectId, $resourceType)
{
    $metrics = new MetricServiceClient([
        'projectId' => $projectId,
    ]);

    $metricName = $metrics->monitoredResourceDescriptorName($projectId, $resourceType);
    $resource = $metrics->getMonitoredResourceDescriptor($metricName);

    printf('Name: %s' . PHP_EOL, $resource->getName());
    printf('Type: %s' . PHP_EOL, $resource->getType());
    printf('Display Name: %s' . PHP_EOL, $resource->getDisplayName());
    printf('Description: %s' . PHP_EOL, $resource->getDescription());
    printf('Labels:' . PHP_EOL);
    foreach ($resource->getLabels() as $labels) {
        printf('  %s (%s) - %s' . PHP_EOL,
            $labels->getKey(),
            $labels->getValueType(),
            $labels->getDescription());
    }
}

Python

client = monitoring_v3.MetricServiceClient()
resource_path = (
    f"projects/{project_id}/monitoredResourceDescriptors/{resource_type_name}"
)
pprint.pprint(client.get_monitored_resource_descriptor(name=resource_path))

Ruby

# Your Google Cloud Platform project ID
# project_id = "YOUR_PROJECT_ID"

# The resource type
# resource_type = "gce_instance"

client = Google::Cloud::Monitoring.metric_service
resource_path = client.monitored_resource_descriptor_path(
  project:                       project_id,
  monitored_resource_descriptor: resource_type
)

result = client.get_monitored_resource_descriptor name: resource_path
p result

If you have difficulty, see Troubleshooting API calls.

What's next