Where do custom metrics I did not set come from

I explicitly track 4 metrics in my app and they all show up in the Azure Application Insights custom metrics. But this list of metrics also has 3 metrics I did not set:

• HealthReportEntryDuration
• HeartbeatState
• TotalDuration

What are these and where did they come from? I do have Health Checks enabled. Also, the 1st & 3rd of these has numbers while the 2nd is flatlined at 0.

Thanks @Peter Bons's for the Answer.

In addition, Please check the below Workaround.

I have created a sample Application Insights with default settings.

I haven't configured anything neither enabled Application Insights for my App.

Initially I don't see any metrics which you have mentioned.

• I have just configured Application Insights from Connected Services in VS and deployed the app to Azure App Service.

• Now Iam able to see the HeartbeatState metric.

• You can also see the namespace details.
• I can see this metrics for all my available applications which I have deployed

AFAIK, HealthReportEntryDuration and TotalDuration are related to HealthCheck. Based on the installed packages related to the health check they might have enabled.

• I have configured HealthCheck in my app.

My Program.cs file:

builder.Services.AddApplicationInsightsTelemetry(new Microsoft.ApplicationInsights.AspNetCore.Extensions.ApplicationInsightsServiceOptions
{
    ConnectionString = builder.Configuration["APPLICATIONINSIGHTS_CONNECTION_STRING"]
});
builder.Services.AddHealthChecks()
    .AddCheck("SampleCheck", () => HealthCheckResult.Healthy(), tags: new[] { "sample" })
    .AddApplicationInsightsPublisher(); 

As per this MSDoc, totalDuration comes under Browser metrics.

To collect browser metrics, your application must be instrumented with the Application Insights JavaScript SDK.

so configured JavaScript SDK as well.

• Now I am able to see the metrics which you have mentioned.

Also refer this MSDoc on Monitoring data reference -Azure Monitor for more details.