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Metrics Configuration

Default Providers

The /metrics route (and starting in 8.0, the /livemetrics route and CollectLiveMetrics actions) will collect metrics from the default providers. The default providers are:

  • System.Runtime
  • Microsoft.AspNetCore.Hosting
  • Grpc.AspNetCore.Server

These providers are collected by default for the above mentioned features, even when specifying custom metrics collection. The default providers can be excluded by disabling them.

Global Counter Interval

Due to limitations in event counters, dotnet monitor supports only one refresh interval when collecting metrics. This interval is used for Prometheus metrics, livemetrics, triggers, traces, and trigger actions that collect traces. The default interval is 5 seconds, but can be changed in configuration.

[7.1+] For EventCounter providers, is possible to specify a different interval for each provider. See Per provider intervals.

JSON 
{
    "GlobalCounter": {
      "IntervalSeconds": 10
    }
}
Kubernetes ConfigMap 
GlobalCounter__IntervalSeconds: "10"
Kubernetes Environment Variables 
- name: DotnetMonitor_GlobalCounter__IntervalSeconds
  value: "10"

Per Provider Intervals

First Available: 7.1

It is possible to override the global interval on a per provider basis. Note this forces all scenarios (triggers, live metrics, prometheus metrics, traces) that use a particular provider to use that interval. Metrics that are System.Diagnostics.Metrics based always use global interval.

JSON 
{
    "GlobalCounter": {
      "IntervalSeconds": 5,
      "Providers": {
          "System.Runtime": {
            "IntervalSeconds": 10
          }
        }
    }
}
Kubernetes ConfigMap 
GlobalCounter__IntervalSeconds: "5"
GlobalCounter__Providers__System.Runtime__IntervalSeconds: "10"
Kubernetes Environment Variables 
- name: DotnetMonitor_GlobalCounter__IntervalSeconds
  value: "5"
- name: DotnetMonitor_GlobalCounter__Providers__System.Runtime__IntervalSeconds
  value: "10"

Metrics Urls

In addition to the ordinary diagnostics urls that dotnet monitor binds to, it also binds to metric urls that only expose the /metrics endpoint. Unlike the other endpoints, the metrics urls do not require authentication. Unless you enable collection of custom providers that may contain sensitive business logic, it is generally considered safe to expose metrics endpoints.

Command Line 
dotnet monitor collect --metricUrls http://*:52325
JSON 
{
  "Metrics": {
    "Endpoints": "http://*:52325"
  }
}
Kubernetes ConfigMap 
Metrics__Endpoints: "http://*:52325"
Kubernetes Environment Variables 
- name: DotnetMonitor_Metrics__Endpoints
  value: "http://*:52325"

Customize collection interval and counts

In the default configuration, dotnet monitor requests that the connected runtime provides updated counter values every 5 seconds and will retain 3 data points for every collected metric. When using a collection tool like Prometheus, it is recommended that you set your scrape interval to MetricCount * GlobalCounter:IntervalSeconds. In the default configuration, we recommend you scrape dotnet monitor for metrics every 15 seconds.

You can customize the number of data points stored per metric via the following configuration:

JSON 
{
  "Metrics": {
    "MetricCount": 3
  }
}
Kubernetes ConfigMap 
Metrics__MetricCount: "3"
Kubernetes Environment Variables 
- name: DotnetMonitor_Metrics__MetricCount
  value: "3"

See Global Counter Interval to change the metrics frequency.

Custom Metrics

Additional metrics providers and counter names to return from this route can be specified via configuration.

JSON 
{
  "Metrics": {
    "Providers": [
      {
        "ProviderName": "Microsoft-AspNetCore-Server-Kestrel",
        "CounterNames": [
          "connections-per-second",
          "total-connections"
        ]
      }
    ]
  }
}
Kubernetes ConfigMap 
Metrics__Providers__0__ProviderName: "Microsoft-AspNetCore-Server-Kestrel"
Metrics__Providers__0__CounterNames__0: "connections-per-second"
Metrics__Providers__0__CounterNames__1: "total-connections"
Kubernetes Environment Variables 
- name: DotnetMonitor_Metrics__Providers__0__ProviderName
  value: "Microsoft-AspNetCore-Server-Kestrel"
- name: DotnetMonitor_Metrics__Providers__0__CounterNames__0
  value: "connections-per-second"
- name: DotnetMonitor_Metrics__Providers__0__CounterNames__1
  value: "total-connections"

Warning: In the default configuration, custom metrics will be exposed along with all other metrics on an unauthenticated endpoint. If your metrics contains sensitive information, we recommend disabling the metrics urls and consuming metrics from the authenticated endpoint (--urls) instead.

When CounterNames are not specified, all the counters associated with the ProviderName are collected.

[8.0+] Custom metrics support labels for metadata. Metadata cannot include commas (,); the inclusion of a comma in metadata will result in all metadata being removed from the custom metric.

[8.0+] System.Diagnostics.Metrics is now supported for custom metrics. At this time, there are the following known limitations:

Adding Meters/Instruments for System.Diagnostics.Metrics

Specifying a Meter is done differently than for EventCounter providers. The following example uses MyCounter1 and MyCounter2 on an EventCounter named MyProvider, as well as the MyInstrument instrument on MyCustomMeter and all instruments on the AnotherMeter meter:

JSON 
{
  "Metrics": {
    "Providers": [
      {
        "ProviderName": "MyProvider",
        "CounterNames": ["MyCounter1", "MyCounter2"]
      }
    ],
    "Meters": [
      {
        "MeterName": "MyCustomMeter",
        "InstrumentNames": ["MyInstrument"]
      },
      {
        "MeterName": "AnotherMeter"
      }
    ]
  }
}
Kubernetes ConfigMap 
Metrics__Providers__0__ProviderName: "MyProvider"
Metrics__Providers__0__CounterNames__0: "MyCounter1"
Metrics__Providers__0__CounterNames__1: "MyCounter2"
Metrics__Meters__0__MeterName: "MyCustomMeter"
Metrics__Meters__0__InstrumentNames__0: "MyInstrument"
Metrics__Meters__1__MeterName: "AnotherMeter"
Kubernetes Environment Variables 
- name: DotnetMonitor_Metrics__Providers__0__ProviderName
  value: "MyProvider"
- name: DotnetMonitor_Metrics__Providers__0__CounterNames__0
  value: "MyCounter1"
- name: DotnetMonitor_Metrics__Providers__0__CounterNames__1
  value: "MyCounter2"
- name: DotnetMonitor_Metrics__Meters__0__MeterName
  value: "MyCustomMeter"
- name: DotnetMonitor_Metrics__Meters__0__InstrumentNames__0
  value: "MyInstrument"
- name: DotnetMonitor_Metrics__Meters__1__MeterName
  value: "AnotherMeter"

Limit How Many Histograms To Track (8.0+)

For System.Diagnostics.Metrics, dotnet monitor allows you to set the maximum number of histograms that can be tracked. Each unique combination of provider name, histogram name, and dimension values counts as one histogram. Tracking more histograms uses more memory in the target process so this bound guards against unintentional high memory use. MaxHistograms has a default value of 20.

JSON 
{
  "GlobalCounter": {
    "MaxHistograms": 5
  }
}
Kubernetes ConfigMap 
GlobalCounter__MaxHistograms: "5"
Kubernetes Environment Variables 
- name: DotnetMonitor_GlobalCounter__MaxHistograms
  value: "5"

Limit How Many Time Series To Track (8.0+)

For System.Diagnostics.Metrics, dotnet monitor allows you to set the maximum number of time series that can be tracked. Each unique combination of provider name, metric name, and dimension values counts as one time series. Tracking more time series uses more memory in the target process so this bound guards against unintentional high memory use. MaxTimeSeries has a default value of 1000.

JSON 
{
  "GlobalCounter": {
    "MaxTimeSeries": 500
  }
}
Kubernetes ConfigMap 
GlobalCounter__MaxTimeSeries: "500"
Kubernetes Environment Variables 
- name: DotnetMonitor_GlobalCounter__MaxTimeSeries
  value: "500"

Disable Default Providers

In addition to enabling custom providers, dotnet monitor also allows you to disable collection of the default providers. You can do so via the following configuration:

JSON 
{
  "Metrics": {
    "IncludeDefaultProviders": false
  }
}
Kubernetes ConfigMap 
Metrics__IncludeDefaultProviders: "false"
Kubernetes Environment Variables 
- name: DotnetMonitor_Metrics__IncludeDefaultProviders
  value: "false"