Removing prometheus-net dependency (kubernetes-client#1526)

* Update README.md

* Update KubernetesClient.csproj

* Delete examples/prometheus directory

* Delete src/KubernetesClient/PrometheusHandler.cs

Author: rkarg-blizz

README.md

@@ -26,14 +26,11 @@ You should also be able to authenticate with the in-cluster service
 account using the `InClusterConfig` function shown below.
 
 ## Monitoring
-There is optional built-in metric generation for prometheus client metrics.
-The exported metrics are:
+Metrics are built in to HttpClient using System.Diagnostics.DiagnosticsSource.
+https://learn.microsoft.com/en-us/dotnet/core/diagnostics/built-in-metrics-system-net
 
-* `k8s_dotnet_request_total` - Counter of request, broken down by HTTP Method
-* `k8s_dotnet_response_code_total` - Counter of responses, broken down by HTTP Method and response code
-* `k8s_request_latency_seconds` - Latency histograms broken down by method, api group, api version and resource kind
-
-There is an example integrating these monitors in the examples/prometheus directory.
+There are many ways these metrics can be consumed/exposed but that decision is up to the application, not KubernetesClient itself.
+https://learn.microsoft.com/en-us/dotnet/core/diagnostics/metrics-collection
 
 ## Sample Code
 

examples/prometheus/Prometheus.cs

@@ -10,7 +10,6 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="prometheus-net" Version="8.2.1" />
         <PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="7.1.2" />
         <PackageReference Include="IdentityModel.OidcClient" Version="5.2.1" />
         <PackageReference Include="Fractions" Version="7.3.0" />
@@ -22,4 +21,4 @@
             OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
     </ItemGroup>
 
-</Project>
+</Project>