Retrieve Azure Monitor metrics with .NET

gucalder 提供
上次更新日期:2017/10/17
在 GitHub 上編輯

This sample explains how to retrieve Monitor metrics and metric definitions using the Azure .NET SDK releases 0.16.0-preview and 0.16.1-preview.

NOTE: please refer to the Microsoft Open Source Code of Conduct.

NOTE: for contributions refer to the CONTRIBUTING.md file.

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Run this sample

  1. If you don't have it, install the .NET Core SDK.

  2. Clone the repository.

    git clone https://github.com/Azure-Samples/monitor-dotnet-metrics-api.git
    
  3. Install the dependencies.

    dotnet restore
    
  4. Create an Azure service principal either through Azure CLI, PowerShell or the portal.

  5. Export these environment variables using your subscription id and the tenant id, client id and client secret from the service principal that you created.

    export AZURE_TENANT_ID={your tenant id}
    export AZURE_CLIENT_ID={your client id}
    export AZURE_CLIENT_SECRET={your client secret}
    export AZURE_SUBSCRIPTION_ID={your subscription id}
    
  6. Run the sample.

    dotnet run program
    

What is program.cs doing?

The sample retrieves metric definitions and metrics for a given resource. It starts by setting up a MonitorClient object using your subscription and credentials.

// Build the service credentials and Monitor client
var serviceCreds = await ApplicationTokenProvider.LoginSilentAsync(tenantId, clientId, secret);
var monitorClient = new MonitorClient(serviceCreds);
monitorClient.SubscriptionId = subscriptionId;

List metric definitions for a resource

List the metric definitions for the given resource, which is defined in the current subscription.

IEnumerable<MetricDefinition> metricDefinitions = await readOnlyClient.MetricDefinitions.ListAsync(resourceUri: resourceUri, cancellationToken: new CancellationToken());

or using a filter

var odataFilterMetricDef = new ODataQuery<MetricDefinition>("name.value eq 'CpuPercentage'");
metricDefinitions = await readOnlyClient.MetricDefinitions.ListAsync(resourceUri: resourceUri, odataQuery: odataFilterMetricDef, cancellationToken: new CancellationToken());

List metrics for a resource

IEnumerable<Metric> metrics = await readOnlyClient.Metrics.ListAsync(resourceUri: resourceUri, cancellationToken: CancellationToken.None);

or with a filter

// The comma-separated list of metric names must be present if a filter is used
var metricNames = "name.value eq 'CpuPercentage'"; // could be concatenated with " or name.value eq '<another name>'" ...

// Time grain is optional when metricNames is present
string timeGrain = " and timeGrain eq duration'PT5M'";

// Defaulting to 3 hours before the time of execution for these datetimes
string startDate = string.Format(" and startTime eq {0}", DateTime.Now.AddHours(-3).ToString("o"));
string endDate = string.Format(" and endTime eq {0}", DateTime.Now.ToString("o"));

var odataFilterMetrics = new ODataQuery<Metric>(
    string.Format(
        "{0}{1}{2}{3}",
        metricNames,
        timeGrain,
        startDate,
        endDate));

Write("Call with filter parameter (i.e. $filter = {0})", odataFilterMetrics);
metrics = await readOnlyClient.Metrics.ListAsync(resourceUri: resourceUri, odataQuery: odataFilterMetrics, cancellationToken: CancellationToken.None);