Error 'Application is not running inside a Kubernetes cluster' in AKS pod's logs

[ReySka91]

Description
We are running ApplicationInsights.Kubernetes with our microservices in AKS.
We take the tool into use like this:
services.AddApplicationInsightsTelemetry();
services.AddApplicationInsightsKubernetesEnricher();

We have configured RBAC permissions according to this guide.

For some reason, the tool does not work at all.

We have run the troubleshooter tool without any issues using the same versions as our main applicaion. We have enabled the diagnostics with services.AddApplicationInsightsKubernetesEnricher(LogLevel.Trace);. The only message related to this tool in the pod's logs is: [Error] [2024-10-03T10:23:15.6375636Z] Application is not running inside a Kubernetes cluster..

Package Versions
Application Insights Kubernetes Version: 7.0.0
Application Insights SDK Version: 2.22.0
.NET Core Version: 8

Expected behavior
The tool works without errors and the additional information is shown in application insights

Actual bevior
The tool fails on error 'Application is not running inside a Kubernetes cluster' even though it is running in AKS.

Can you please help with this issue? I'm not sure whether this is a bug or just a misconfiguration or if it has something to do with our versions (even though the troubleshooter works with the same versions)

[xiaomi7732]

@ReySka91, in the latest version, the check is straightforward:

ApplicationInsights-Kubernetes/src/ApplicationInsights.Kubernetes/ClusterEnvironmentCheck.cs

Line 7 in 81610ab

public bool IsInCluster => KubernetesClientConfiguration.IsInCluster();

That, in turn, calls:
https://github.com/kubernetes-client/csharp/blob/541abb00bd1472e86b37863822cce5415613806b/src/KubernetesClient/KubernetesClientConfiguration.InCluster.cs#L21

Basically, do you see any of these line of code returning false for your environment:

        public static bool IsInCluster()
        {
            var host = Environment.GetEnvironmentVariable("KUBERNETES_SERVICE_HOST");
            var port = Environment.GetEnvironmentVariable("KUBERNETES_SERVICE_PORT");

            if (string.IsNullOrEmpty(host) || string.IsNullOrEmpty(port))
            {
                return false;
            }

            var tokenPath = Path.Combine(ServiceAccountPath, ServiceAccountTokenKeyFileName);
            if (!FileSystem.Current.Exists(tokenPath))
            {
                return false;
            }

            var certPath = Path.Combine(ServiceAccountPath, ServiceAccountRootCAKeyFileName);
            return FileSystem.Current.Exists(certPath);
        }