Monitoring and collecting data from .NET Core

.NET Core is an open-source and cross-platform framework to build applications for all operating system including Windows, Mac, and Linux. .NET Core is a fork of the NET Framework, a modular implementation that can be used in a wide variety of verticals, scaling from the data center to touch based devices.

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How it works

This plugin analyzes the performance of your .NET Core application.

The minimal supported version of .NET Core is 1.1.x.


The plugin needs to be installed together with a CoScale agent, instructions on how to install the CoScale agent can be found here. If you want to monitor .NET Core inside Docker containers using CoScale, check out the instructions here.


For gathering global statistics, the AppMetric library is used alongside with the CoScale extension. You can download the extension from

Add the AppMetrics library and the CoScale extension to the project: <project-dir>WebApplication1.csproj:

    <PackageReference Include="App.Metrics.AspNetCore.Mvc" Version="2.0.0-alpha" />
    <PackageReference Include="App.Metrics.AspNetCore.Tracking" Version="2.0.0-alpha" />
    <Reference Include="ResourceMetrics">

Change the Program.cs file to enable AppMetrics:

public static class Program
    public static IWebHost BuildWebHost(string[] args)
        return WebHost.CreateDefaultBuilder(args)

    public static void Main(string[] args) { BuildWebHost(args).Run(); }

Change the Startup.cs file in order to allow App Metrics to inspect MVC routes:

public class Startup
    public void Configure(IApplicationBuilder app)

    public void ConfigureServices(IServiceCollection services)
        services.AddMvc(options => options.AddMetricsResourceFilter());

Build the application to apply these changes.

Provide the status URL, as you configured it on your server. E.g.: http://localhost/metrics

Active checks

This plugin can be configured to perform a HTTP GET on your .NET Core application. This active monitoring allows us to calculate the uptime of the service and the response time of the provided URL.

A full URL (eg. http://localhost/test_page) should be provided.


.NET Core

Name Unit Dimensions
.NET Core active check latency s  
.NET Core active check uptime %  

.NET Core / GC

Name Unit Dimensions
.NET Core GC last GC time s  
.NET Core GC total collection count #  
.NET Core GC total memory b  

.NET Core / Process

Name Unit Dimensions
.NET Core Process maximum physical memory set b  
.NET Core Process nonpaged system memory size b  
.NET Core Process paged memory size b  
.NET Core Process peak paged memory size b  
.NET Core Process peak working set b  
.NET Core Process threads count #  
.NET Core Process total processor time %  
.NET Core Process user processor time %  
.NET Core Process virtual memory size b  
.NET Core Process working set b  

.NET Core / WebTracking

Name Unit Dimensions
.NET Core Active Requests #  
.NET Core Application Performance Index   level
.NET Core Application Performance Index score    
.NET Core Average POST Size b  
.NET Core Average PUT Size b  
.NET Core One Minute Error Percentage Rate req  
.NET Core Request Error count # http_status_code
.NET Core Request Error Rate req  
.NET Core Request Error Rate Per Endpoint req method, endpoint
.NET Core Request Error Rate Per Endpoint And Status Code req method, endpoint, http_status_code
.NET Core Total Transactions req  
.NET Core Total Transactions duration s  
.NET Core Transactions Per Endpoint req method, endpoint
.NET Core Transactions Per Endpoint duration s method, endpoint