Azure Monitor Query Metrics client library for .NET

The Azure Monitor Query Metrics client library is used to execute read-only queries for metrics across multiple Azure resources in a single request.

Metrics - Collects numeric data from monitored resources into a time series database. Metrics are numerical values that are collected at regular intervals and describe some aspect of a system at a particular time. Metrics are lightweight and capable of supporting near real-time scenarios, making them useful for alerting and fast detection of issues.

Resources:

Getting started

Prerequisites

An Azure subscription
A TokenCredential implementation, such as an Azure Identity library credential type.
To query Metrics, you need an Azure resource of any kind (Storage Account, Key Vault, Cosmos DB, etc.).

Install the package

Install the Azure Monitor Query Metrics client library for .NET with NuGet:

dotnetcli

dotnet add package Azure.Monitor.Query.Metrics

Authenticate the client

An authenticated client is required to query Metrics. To authenticate, create an instance of a TokenCredential class. Pass it to the constructor of the MetricsClient class. To satisfy the TokenCredential requirement, the following examples use DefaultAzureCredential from the Azure.Identity package.

For Metrics queries across multiple Azure resources, use the following client:

var client = new MetricsClient(
    new Uri("https://<region>.metrics.monitor.azure.com"),
    new DefaultAzureCredential());

Configure client for Azure sovereign cloud

By default, MetricsClient is configured to use the Azure Public Cloud. To use a sovereign cloud instead, set the Audience property on the MetricsClientOptions class. For example:

// MetricsClient
var metricsClientOptions = new MetricsClientOptions
{
    Audience = MetricsClientAudience.AzureGovernment
};
var metricsClient = new MetricsClient(
    new Uri("https://usgovvirginia.metrics.monitor.azure.us"),
    new DefaultAzureCredential(),
    metricsClientOptions);

Execute the query

For examples of Metrics queries, see the Examples section.

Key concepts

Metrics data structure

Each set of metric values is a time series with the following characteristics:

The time the value was collected
The resource associated with the value
A namespace that acts like a category for the metric
A metric name
The value itself
Some metrics have multiple dimensions as described in multi-dimensional metrics. Custom metrics can have up to 10 dimensions.

Thread safety

All client instance methods are thread-safe and independent of each other (guideline). This design ensures that the recommendation of reusing client instances is always safe, even across threads.

Additional concepts

Examples

Query metrics for multiple resources
- Query with options
- Query with time range
Register the client with dependency injection

Query metrics for multiple resources

To query metrics for multiple Azure resources in a single request, use the MetricsClient.QueryResourcesAsync method. This method:

Calls a regional metrics endpoint. You must specify the regional endpoint when creating the client. For example, "https://westus3.metrics.monitor.azure.com".
Requires that each Azure resource must reside in:
- The same region as the endpoint specified when creating the client.
- The same Azure subscription.

Furthermore:

The user must be authorized to read monitoring data at the Azure subscription level. For example, the Monitoring Reader role on the subscription to be queried.
The metric namespace containing the metrics to be queried must be provided. For a list of metric namespaces, see Supported metrics and log categories by resource type.

string resourceId =
    "/subscriptions/<id>/resourceGroups/<rg-name>/providers/<source>/storageAccounts/<resource-name-1>";
var client = new MetricsClient(
    new Uri("https://<region>.metrics.monitor.azure.com"),
    new DefaultAzureCredential());
Response<MetricsQueryResourcesResult> result = await client.QueryResourcesAsync(
    resourceIds: new List<ResourceIdentifier> { new ResourceIdentifier(resourceId) },
    metricNames: new List<string> { "Ingress" },
    metricNamespace: "Microsoft.Storage/storageAccounts").ConfigureAwait(false);

MetricsQueryResourcesResult metricsQueryResults = result.Value;
foreach (MetricsQueryResult value in metricsQueryResults.Values)
{
    Console.WriteLine(value.Metrics.Count);
}

For an inventory of metrics and dimensions available for each Azure resource type, see Supported metrics with Azure Monitor.

Query metrics with options

The QueryResourcesAsync method also accepts a MetricsQueryResourcesOptions-typed argument, in which the user can specify extra properties to filter the results. The following example demonstrates the OrderBy and Size properties:

string resourceId =
    "/subscriptions/<id>/resourceGroups/<rg-name>/providers/<source>/storageAccounts/<resource-name-1>";
var client = new MetricsClient(
    new Uri("https://<region>.metrics.monitor.azure.com"),
    new DefaultAzureCredential());
var options = new MetricsQueryResourcesOptions
{
    OrderBy = "sum asc",
    Size = 10
};

Response<MetricsQueryResourcesResult> result = await client.QueryResourcesAsync(
    resourceIds: new List<ResourceIdentifier> { new ResourceIdentifier(resourceId) },
    metricNames: new List<string> { "Ingress" },
    metricNamespace: "Microsoft.Storage/storageAccounts",
    options).ConfigureAwait(false);

MetricsQueryResourcesResult metricsQueryResults = result.Value;
foreach (MetricsQueryResult value in metricsQueryResults.Values)
{
    Console.WriteLine(value.Metrics.Count);
}

Query metrics with time range

The MetricsQueryResourcesOptions-typed argument also has a StartTime and EndTime property to allow for querying a specific time range. If only the StartTime is set, the EndTime default becomes the current time. When the EndTime is specified, the StartTime is necessary as well. The following example demonstrates the use of these properties:

string resourceId =
    "/subscriptions/<id>/resourceGroups/<rg-name>/providers/<source>/storageAccounts/<resource-name-1>";
var client = new MetricsClient(
    new Uri("https://<region>.metrics.monitor.azure.com"),
    new DefaultAzureCredential());
var options = new MetricsQueryResourcesOptions
{
    StartTime = DateTimeOffset.Now.AddHours(-4),
    EndTime = DateTimeOffset.Now.AddHours(-1),
    OrderBy = "sum asc",
    Size = 10
};

Response<MetricsQueryResourcesResult> result = await client.QueryResourcesAsync(
    resourceIds: new List<ResourceIdentifier> { new ResourceIdentifier(resourceId) },
    metricNames: new List<string> { "Ingress" },
    metricNamespace: "Microsoft.Storage/storageAccounts",
    options).ConfigureAwait(false);

MetricsQueryResourcesResult metricsQueryResults = result.Value;
foreach (MetricsQueryResult value in metricsQueryResults.Values)
{
    Console.WriteLine(value.Metrics.Count);
}

Register the client with dependency injection

To register a client with the dependency injection container, invoke the AddMetricsClient extension method.

For more information, see Register client.

Troubleshooting

To diagnose various failure scenarios, see the troubleshooting guide.

Next steps

To learn more about Azure Monitor, see the Azure Monitor service documentation.

Contributing

This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit cla.microsoft.com.

When you submit a pull request, a CLA-bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately with labels and comments. Follow the instructions provided by the bot. You'll only need to sign the CLA once across all Microsoft repos.

This project has adopted the Microsoft Open Source Code of Conduct. For more information, see the Code of Conduct FAQ or contact [email protected] with any questions or comments.