Dust off Prometheus Exporters (#3507)

docs/metrics/getting-started-prometheus-grafana/getting-started-prometheus-grafana.csproj

@@ -1,7 +1,4 @@
 <Project Sdk="Microsoft.NET.Sdk">
-  <PropertyGroup>
-    <TargetFrameworks>netstandard2.0</TargetFrameworks>
-  </PropertyGroup>
   <ItemGroup>
     <ProjectReference Include="$(RepoRoot)\src\OpenTelemetry.Exporter.Prometheus.HttpListener\OpenTelemetry.Exporter.Prometheus.HttpListener.csproj" />
   </ItemGroup>

examples/Console/TestPrometheusExporter.cs

@@ -52,8 +52,7 @@ internal static object Run(int port)
             .AddMeter(MyMeter.Name)
             .AddMeter(MyMeter2.Name)
             .AddPrometheusHttpListener(
-                exporterOptions => exporterOptions.ScrapeResponseCacheDurationMilliseconds = 0,
-                listenerOptions => listenerOptions.Prefixes = new string[] { $"http://localhost:{port}/" })
+                options => options.Prefixes = new string[] { $"http://localhost:{port}/" })
             .Build();
 
         var process = Process.GetCurrentProcess();

src/OpenTelemetry.Exporter.Prometheus.AspNetCore/.publicApi/netcoreapp3.1/PublicAPI.Unshipped.txt

@@ -1,11 +1,11 @@
 Microsoft.AspNetCore.Builder.PrometheusExporterApplicationBuilderExtensions
 Microsoft.AspNetCore.Builder.PrometheusExporterEndpointRouteBuilderExtensions
-OpenTelemetry.Exporter.Prometheus.AspNetCore.PrometheusExporterOptions
-OpenTelemetry.Exporter.Prometheus.AspNetCore.PrometheusExporterOptions.PrometheusExporterOptions() -> void
-OpenTelemetry.Exporter.Prometheus.AspNetCore.PrometheusExporterOptions.ScrapeEndpointPath.get -> string
-OpenTelemetry.Exporter.Prometheus.AspNetCore.PrometheusExporterOptions.ScrapeEndpointPath.set -> void
-OpenTelemetry.Exporter.Prometheus.AspNetCore.PrometheusExporterOptions.ScrapeResponseCacheDurationMilliseconds.get -> int
-OpenTelemetry.Exporter.Prometheus.AspNetCore.PrometheusExporterOptions.ScrapeResponseCacheDurationMilliseconds.set -> void
+OpenTelemetry.Exporter.Prometheus.PrometheusExporterOptions
+OpenTelemetry.Exporter.Prometheus.PrometheusExporterOptions.PrometheusExporterOptions() -> void
+OpenTelemetry.Exporter.Prometheus.PrometheusExporterOptions.ScrapeEndpointPath.get -> string
+OpenTelemetry.Exporter.Prometheus.PrometheusExporterOptions.ScrapeEndpointPath.set -> void
+OpenTelemetry.Exporter.Prometheus.PrometheusExporterOptions.ScrapeResponseCacheDurationMilliseconds.get -> int
+OpenTelemetry.Exporter.Prometheus.PrometheusExporterOptions.ScrapeResponseCacheDurationMilliseconds.set -> void
 OpenTelemetry.Metrics.PrometheusExporterMeterProviderBuilderExtensions
 static Microsoft.AspNetCore.Builder.PrometheusExporterApplicationBuilderExtensions.UseOpenTelemetryPrometheusScrapingEndpoint(this Microsoft.AspNetCore.Builder.IApplicationBuilder app) -> Microsoft.AspNetCore.Builder.IApplicationBuilder
 static Microsoft.AspNetCore.Builder.PrometheusExporterApplicationBuilderExtensions.UseOpenTelemetryPrometheusScrapingEndpoint(this Microsoft.AspNetCore.Builder.IApplicationBuilder app, OpenTelemetry.Metrics.MeterProvider meterProvider, System.Func<Microsoft.AspNetCore.Http.HttpContext, bool> predicate, string path, System.Action<Microsoft.AspNetCore.Builder.IApplicationBuilder> configureBranchedPipeline) -> Microsoft.AspNetCore.Builder.IApplicationBuilder
@@ -14,4 +14,4 @@ static Microsoft.AspNetCore.Builder.PrometheusExporterApplicationBuilderExtensio
 static Microsoft.AspNetCore.Builder.PrometheusExporterEndpointRouteBuilderExtensions.MapPrometheusScrapingEndpoint(this Microsoft.AspNetCore.Routing.IEndpointRouteBuilder endpoints) -> Microsoft.AspNetCore.Builder.IEndpointConventionBuilder
 static Microsoft.AspNetCore.Builder.PrometheusExporterEndpointRouteBuilderExtensions.MapPrometheusScrapingEndpoint(this Microsoft.AspNetCore.Routing.IEndpointRouteBuilder endpoints, string path = null, OpenTelemetry.Metrics.MeterProvider meterProvider = null, System.Action<Microsoft.AspNetCore.Builder.IApplicationBuilder> configureBranchedPipeline = null) -> Microsoft.AspNetCore.Builder.IEndpointConventionBuilder
 static Microsoft.AspNetCore.Builder.PrometheusExporterEndpointRouteBuilderExtensions.MapPrometheusScrapingEndpoint(this Microsoft.AspNetCore.Routing.IEndpointRouteBuilder endpoints, string path) -> Microsoft.AspNetCore.Builder.IEndpointConventionBuilder
-static OpenTelemetry.Metrics.PrometheusExporterMeterProviderBuilderExtensions.AddPrometheusExporter(this OpenTelemetry.Metrics.MeterProviderBuilder builder, System.Action<OpenTelemetry.Exporter.Prometheus.AspNetCore.PrometheusExporterOptions> configure = null) -> OpenTelemetry.Metrics.MeterProviderBuilder
+static OpenTelemetry.Metrics.PrometheusExporterMeterProviderBuilderExtensions.AddPrometheusExporter(this OpenTelemetry.Metrics.MeterProviderBuilder builder, System.Action<OpenTelemetry.Exporter.Prometheus.PrometheusExporterOptions> configure = null) -> OpenTelemetry.Metrics.MeterProviderBuilder

src/OpenTelemetry.Exporter.Prometheus.AspNetCore/OpenTelemetry.Exporter.Prometheus.AspNetCore.csproj

@@ -3,7 +3,7 @@
   <PropertyGroup>
     <!-- OmniSharp/VS Code requires TargetFrameworks to be in descending order for IntelliSense and analysis. -->
     <TargetFrameworks>netcoreapp3.1</TargetFrameworks>
-    <Description>AspNetCore middleware for hosting OpenTelemetry .NET Prometheus exporter</Description>
+    <Description>ASP.NET Core middleware for hosting OpenTelemetry .NET Prometheus Exporter</Description>
     <PackageTags>$(PackageTags);prometheus;metrics</PackageTags>
     <MinVerTagPrefix>core-</MinVerTagPrefix>
   </PropertyGroup>
@@ -19,14 +19,13 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <Compile Include="$(RepoRoot)\src\OpenTelemetry.Exporter.Prometheus.HttpListener\Shared\PrometheusCollectionManager.cs" Link="Includes/PrometheusCollectionManager.cs" />
-    <Compile Include="$(RepoRoot)\src\OpenTelemetry.Exporter.Prometheus.HttpListener\Shared\PrometheusExporter.cs" Link="Includes/PrometheusExporter.cs" />
-    <Compile Include="$(RepoRoot)\src\OpenTelemetry.Exporter.Prometheus.HttpListener\Shared\PrometheusExporterEventSource.cs" Link="Includes/PrometheusExporterEventSource.cs" />
-    <Compile Include="$(RepoRoot)\src\OpenTelemetry.Exporter.Prometheus.HttpListener\Shared\PrometheusExporterOptions.cs" Link="Includes/PrometheusExporterOptions.cs" />
-    <Compile Include="$(RepoRoot)\src\OpenTelemetry.Exporter.Prometheus.HttpListener\Shared\PrometheusSerializer.cs" Link="Includes/PrometheusSerializer.cs" />
-    <Compile Include="$(RepoRoot)\src\OpenTelemetry.Exporter.Prometheus.HttpListener\Shared\PrometheusSerializerExt.cs" Link="Includes/PrometheusSerializerExt.cs" />
     <Compile Include="$(RepoRoot)\src\OpenTelemetry.Api\Internal\ExceptionExtensions.cs" Link="Includes\ExceptionExtensions.cs" />
     <Compile Include="$(RepoRoot)\src\OpenTelemetry.Api\Internal\Guard.cs" Link="Includes\Guard.cs" />
+    <Compile Include="$(RepoRoot)\src\OpenTelemetry.Exporter.Prometheus.HttpListener\Internal\PrometheusCollectionManager.cs" Link="Includes/PrometheusCollectionManager.cs" />
+    <Compile Include="$(RepoRoot)\src\OpenTelemetry.Exporter.Prometheus.HttpListener\Internal\PrometheusExporter.cs" Link="Includes/PrometheusExporter.cs" />
+    <Compile Include="$(RepoRoot)\src\OpenTelemetry.Exporter.Prometheus.HttpListener\Internal\PrometheusExporterEventSource.cs" Link="Includes/PrometheusExporterEventSource.cs" />
+    <Compile Include="$(RepoRoot)\src\OpenTelemetry.Exporter.Prometheus.HttpListener\Internal\PrometheusSerializer.cs" Link="Includes/PrometheusSerializer.cs" />
+    <Compile Include="$(RepoRoot)\src\OpenTelemetry.Exporter.Prometheus.HttpListener\Internal\PrometheusSerializerExt.cs" Link="Includes/PrometheusSerializerExt.cs" />
   </ItemGroup>
 
   <ItemGroup>

src/OpenTelemetry.Exporter.Prometheus.AspNetCore/PrometheusExporterApplicationBuilderExtensions.cs

@@ -19,7 +19,7 @@
 using System;
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.DependencyInjection;
-using OpenTelemetry.Exporter.Prometheus.AspNetCore;
+using OpenTelemetry.Exporter.Prometheus;
 using OpenTelemetry.Internal;
 using OpenTelemetry.Metrics;
 

src/OpenTelemetry.Exporter.Prometheus.AspNetCore/PrometheusExporterEndpointRouteBuilderExtensions.cs

@@ -20,7 +20,7 @@
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Routing;
 using Microsoft.Extensions.DependencyInjection;
-using OpenTelemetry.Exporter.Prometheus.AspNetCore;
+using OpenTelemetry.Exporter.Prometheus;
 using OpenTelemetry.Internal;
 using OpenTelemetry.Metrics;
 

src/OpenTelemetry.Exporter.Prometheus.AspNetCore/PrometheusExporterMeterProviderBuilderExtensions.cs

@@ -15,8 +15,7 @@
 // </copyright>
 
 using System;
-using OpenTelemetry.Exporter.Prometheus.AspNetCore;
-using OpenTelemetry.Exporter.Prometheus.HttpListener.Shared;
+using OpenTelemetry.Exporter.Prometheus;
 using OpenTelemetry.Internal;
 
 namespace OpenTelemetry.Metrics
@@ -51,7 +50,7 @@ private static MeterProviderBuilder AddPrometheusExporter(MeterProviderBuilder b
         {
             configure?.Invoke(options);
 
-            var exporter = new PrometheusExporter(options);
+            var exporter = new PrometheusExporter(scrapeEndpointPath: options.ScrapeEndpointPath, scrapeResponseCacheDurationMilliseconds: options.ScrapeResponseCacheDurationMilliseconds);
             var reader = new BaseExportingMetricReader(exporter)
             {
                 TemporalityPreference = MetricReaderTemporalityPreference.Cumulative,

src/OpenTelemetry.Exporter.Prometheus.AspNetCore/PrometheusExporterMiddleware.cs

@@ -19,11 +19,10 @@
 using System.Diagnostics;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Http;
-using OpenTelemetry.Exporter.Prometheus.HttpListener.Shared;
 using OpenTelemetry.Internal;
 using OpenTelemetry.Metrics;
 
-namespace OpenTelemetry.Exporter.Prometheus.AspNetCore
+namespace OpenTelemetry.Exporter.Prometheus
 {
     /// <summary>
     /// ASP.NET Core middleware for exposing a Prometheus metrics scraping endpoint.

src/OpenTelemetry.Exporter.Prometheus.HttpListener/Shared/PrometheusExporterOptions.cs → src/OpenTelemetry.Exporter.Prometheus.AspNetCore/PrometheusExporterOptions.cs

@@ -14,27 +14,21 @@
 // limitations under the License.
 // </copyright>
 
-using System;
 using OpenTelemetry.Internal;
 
-#if PROMETHEUS_ASPNETCORE
-namespace OpenTelemetry.Exporter.Prometheus.AspNetCore
-#else
-namespace OpenTelemetry.Exporter.Prometheus.HttpListener.Shared
-#endif
+namespace OpenTelemetry.Exporter.Prometheus
 {
     /// <summary>
     /// Prometheus exporter options.
     /// </summary>
     public class PrometheusExporterOptions
     {
         internal const string DefaultScrapeEndpointPath = "/metrics";
-        internal Func<DateTimeOffset> GetUtcNowDateTimeOffset = () => DateTimeOffset.UtcNow;
 
         private int scrapeResponseCacheDurationMilliseconds = 10 * 1000;
 
         /// <summary>
-        /// Gets or sets the path to use for the scraping endpoint. Default value: /metrics.
+        /// Gets or sets the path to use for the scraping endpoint. Default value: "/metrics".
         /// </summary>
         public string ScrapeEndpointPath { get; set; } = DefaultScrapeEndpointPath;
 

src/OpenTelemetry.Exporter.Prometheus.HttpListener/.publicApi/net462/PublicAPI.Unshipped.txt

@@ -1,12 +1,8 @@
-OpenTelemetry.Exporter.Prometheus.HttpListener.PrometheusHttpListenerOptions
-OpenTelemetry.Exporter.Prometheus.HttpListener.PrometheusHttpListenerOptions.Prefixes.get -> System.Collections.Generic.IReadOnlyCollection<string>
-OpenTelemetry.Exporter.Prometheus.HttpListener.PrometheusHttpListenerOptions.Prefixes.set -> void
-OpenTelemetry.Exporter.Prometheus.HttpListener.PrometheusHttpListenerOptions.PrometheusHttpListenerOptions() -> void
-OpenTelemetry.Exporter.Prometheus.HttpListener.Shared.PrometheusExporterOptions
-OpenTelemetry.Exporter.Prometheus.HttpListener.Shared.PrometheusExporterOptions.PrometheusExporterOptions() -> void
-OpenTelemetry.Exporter.Prometheus.HttpListener.Shared.PrometheusExporterOptions.ScrapeEndpointPath.get -> string
-OpenTelemetry.Exporter.Prometheus.HttpListener.Shared.PrometheusExporterOptions.ScrapeEndpointPath.set -> void
-OpenTelemetry.Exporter.Prometheus.HttpListener.Shared.PrometheusExporterOptions.ScrapeResponseCacheDurationMilliseconds.get -> int
-OpenTelemetry.Exporter.Prometheus.HttpListener.Shared.PrometheusExporterOptions.ScrapeResponseCacheDurationMilliseconds.set -> void
-OpenTelemetry.Metrics.PrometheusExporterHttpListenerMeterProviderBuilderExtensions
-static OpenTelemetry.Metrics.PrometheusExporterHttpListenerMeterProviderBuilderExtensions.AddPrometheusHttpListener(this OpenTelemetry.Metrics.MeterProviderBuilder builder, System.Action<OpenTelemetry.Exporter.Prometheus.HttpListener.Shared.PrometheusExporterOptions> configureExporterOptions = null, System.Action<OpenTelemetry.Exporter.Prometheus.HttpListener.PrometheusHttpListenerOptions> configureListenerOptions = null) -> OpenTelemetry.Metrics.MeterProviderBuilder
+OpenTelemetry.Exporter.Prometheus.PrometheusHttpListenerOptions
+OpenTelemetry.Exporter.Prometheus.PrometheusHttpListenerOptions.Prefixes.get -> System.Collections.Generic.IReadOnlyCollection<string>
+OpenTelemetry.Exporter.Prometheus.PrometheusHttpListenerOptions.Prefixes.set -> void
+OpenTelemetry.Exporter.Prometheus.PrometheusHttpListenerOptions.PrometheusHttpListenerOptions() -> void
+OpenTelemetry.Exporter.Prometheus.PrometheusHttpListenerOptions.ScrapeEndpointPath.get -> string
+OpenTelemetry.Exporter.Prometheus.PrometheusHttpListenerOptions.ScrapeEndpointPath.set -> void
+OpenTelemetry.Metrics.PrometheusHttpListenerMeterProviderBuilderExtensions
+static OpenTelemetry.Metrics.PrometheusHttpListenerMeterProviderBuilderExtensions.AddPrometheusHttpListener(this OpenTelemetry.Metrics.MeterProviderBuilder builder, System.Action<OpenTelemetry.Exporter.Prometheus.PrometheusHttpListenerOptions> configure = null) -> OpenTelemetry.Metrics.MeterProviderBuilder

src/OpenTelemetry.Exporter.Prometheus.HttpListener/.publicApi/netstandard2.0/PublicAPI.Unshipped.txt

@@ -1,12 +1,8 @@
-OpenTelemetry.Exporter.Prometheus.HttpListener.PrometheusHttpListenerOptions
-OpenTelemetry.Exporter.Prometheus.HttpListener.PrometheusHttpListenerOptions.Prefixes.get -> System.Collections.Generic.IReadOnlyCollection<string>
-OpenTelemetry.Exporter.Prometheus.HttpListener.PrometheusHttpListenerOptions.Prefixes.set -> void
-OpenTelemetry.Exporter.Prometheus.HttpListener.PrometheusHttpListenerOptions.PrometheusHttpListenerOptions() -> void
-OpenTelemetry.Exporter.Prometheus.HttpListener.Shared.PrometheusExporterOptions
-OpenTelemetry.Exporter.Prometheus.HttpListener.Shared.PrometheusExporterOptions.PrometheusExporterOptions() -> void
-OpenTelemetry.Exporter.Prometheus.HttpListener.Shared.PrometheusExporterOptions.ScrapeEndpointPath.get -> string
-OpenTelemetry.Exporter.Prometheus.HttpListener.Shared.PrometheusExporterOptions.ScrapeEndpointPath.set -> void
-OpenTelemetry.Exporter.Prometheus.HttpListener.Shared.PrometheusExporterOptions.ScrapeResponseCacheDurationMilliseconds.get -> int
-OpenTelemetry.Exporter.Prometheus.HttpListener.Shared.PrometheusExporterOptions.ScrapeResponseCacheDurationMilliseconds.set -> void
-OpenTelemetry.Metrics.PrometheusExporterHttpListenerMeterProviderBuilderExtensions
-static OpenTelemetry.Metrics.PrometheusExporterHttpListenerMeterProviderBuilderExtensions.AddPrometheusHttpListener(this OpenTelemetry.Metrics.MeterProviderBuilder builder, System.Action<OpenTelemetry.Exporter.Prometheus.HttpListener.Shared.PrometheusExporterOptions> configureExporterOptions = null, System.Action<OpenTelemetry.Exporter.Prometheus.HttpListener.PrometheusHttpListenerOptions> configureListenerOptions = null) -> OpenTelemetry.Metrics.MeterProviderBuilder
+OpenTelemetry.Exporter.Prometheus.PrometheusHttpListenerOptions
+OpenTelemetry.Exporter.Prometheus.PrometheusHttpListenerOptions.Prefixes.get -> System.Collections.Generic.IReadOnlyCollection<string>
+OpenTelemetry.Exporter.Prometheus.PrometheusHttpListenerOptions.Prefixes.set -> void
+OpenTelemetry.Exporter.Prometheus.PrometheusHttpListenerOptions.PrometheusHttpListenerOptions() -> void
+OpenTelemetry.Exporter.Prometheus.PrometheusHttpListenerOptions.ScrapeEndpointPath.get -> string
+OpenTelemetry.Exporter.Prometheus.PrometheusHttpListenerOptions.ScrapeEndpointPath.set -> void
+OpenTelemetry.Metrics.PrometheusHttpListenerMeterProviderBuilderExtensions
+static OpenTelemetry.Metrics.PrometheusHttpListenerMeterProviderBuilderExtensions.AddPrometheusHttpListener(this OpenTelemetry.Metrics.MeterProviderBuilder builder, System.Action<OpenTelemetry.Exporter.Prometheus.PrometheusHttpListenerOptions> configure = null) -> OpenTelemetry.Metrics.MeterProviderBuilder

src/OpenTelemetry.Exporter.Prometheus.HttpListener/Shared/PrometheusCollectionManager.cs → src/OpenTelemetry.Exporter.Prometheus.HttpListener/Internal/PrometheusCollectionManager.cs

@@ -20,12 +20,12 @@
 using System.Threading.Tasks;
 using OpenTelemetry.Metrics;
 
-namespace OpenTelemetry.Exporter.Prometheus.HttpListener.Shared
+namespace OpenTelemetry.Exporter.Prometheus
 {
     internal sealed class PrometheusCollectionManager
     {
         private readonly PrometheusExporter exporter;
-        private readonly int scrapeResponseCacheDurationInMilliseconds;
+        private readonly int scrapeResponseCacheDurationMilliseconds;
         private readonly Func<Batch<Metric>, ExportResult> onCollectRef;
         private byte[] buffer = new byte[85000]; // encourage the object to live in LOH (large object heap)
         private int globalLockState;
@@ -38,7 +38,7 @@ internal sealed class PrometheusCollectionManager
         public PrometheusCollectionManager(PrometheusExporter exporter)
         {
             this.exporter = exporter;
-            this.scrapeResponseCacheDurationInMilliseconds = this.exporter.Options.ScrapeResponseCacheDurationMilliseconds;
+            this.scrapeResponseCacheDurationMilliseconds = this.exporter.ScrapeResponseCacheDurationMilliseconds;
             this.onCollectRef = this.OnCollect;
         }
 
@@ -53,8 +53,8 @@ public Task<CollectionResponse> EnterCollect()
             // If we are within {ScrapeResponseCacheDurationMilliseconds} of the
             // last successful collect, return the previous view.
             if (this.previousDataViewGeneratedAtUtc.HasValue
-                && this.scrapeResponseCacheDurationInMilliseconds > 0
-                && this.previousDataViewGeneratedAtUtc.Value.AddMilliseconds(this.scrapeResponseCacheDurationInMilliseconds) >= DateTime.UtcNow)
+                && this.scrapeResponseCacheDurationMilliseconds > 0
+                && this.previousDataViewGeneratedAtUtc.Value.AddMilliseconds(this.scrapeResponseCacheDurationMilliseconds) >= DateTime.UtcNow)
             {
                 Interlocked.Increment(ref this.readerCount);
                 this.ExitGlobalLock();

src/OpenTelemetry.Exporter.Prometheus.HttpListener/Shared/PrometheusExporter.cs → src/OpenTelemetry.Exporter.Prometheus.HttpListener/Internal/PrometheusExporter.cs

@@ -15,32 +15,34 @@
 // </copyright>
 
 using System;
-#if PROMETHEUS_ASPNETCORE
-using OpenTelemetry.Exporter.Prometheus.AspNetCore;
-#endif
+using OpenTelemetry.Internal;
 using OpenTelemetry.Metrics;
 
-namespace OpenTelemetry.Exporter.Prometheus.HttpListener.Shared
+namespace OpenTelemetry.Exporter.Prometheus
 {
     /// <summary>
     /// Exporter of OpenTelemetry metrics to Prometheus.
     /// </summary>
     [ExportModes(ExportModes.Pull)]
     internal sealed class PrometheusExporter : BaseExporter<Metric>, IPullMetricExporter
     {
-        internal const string HttpListenerStartFailureExceptionMessage = "PrometheusExporter http listener could not be started.";
-        internal readonly PrometheusExporterOptions Options;
         private Func<int, bool> funcCollect;
         private Func<Batch<Metric>, ExportResult> funcExport;
         private bool disposed = false;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="PrometheusExporter"/> class.
         /// </summary>
-        /// <param name="options">Options for the exporter.</param>
-        public PrometheusExporter(PrometheusExporterOptions options)
+        /// <param name="scrapeEndpointPath">Scraping endpoint.</param>
+        /// <param name="scrapeResponseCacheDurationMilliseconds">
+        /// The cache duration in milliseconds for scrape responses. Default value: 0.
+        /// </param>
+        public PrometheusExporter(string scrapeEndpointPath = null, int scrapeResponseCacheDurationMilliseconds = 0)
         {
-            this.Options = options;
+            Guard.ThrowIfOutOfRange(scrapeResponseCacheDurationMilliseconds, min: 0);
+
+            this.ScrapeEndpointPath = scrapeEndpointPath ?? "/metrics";
+            this.ScrapeResponseCacheDurationMilliseconds = scrapeResponseCacheDurationMilliseconds;
             this.CollectionManager = new PrometheusCollectionManager(this);
         }
 
@@ -63,6 +65,10 @@ internal Func<Batch<Metric>, ExportResult> OnExport
 
         internal PrometheusCollectionManager CollectionManager { get; }
 
+        internal int ScrapeResponseCacheDurationMilliseconds { get; }
+
+        internal string ScrapeEndpointPath { get; }
+
         /// <inheritdoc/>
         public override ExportResult Export(in Batch<Metric> metrics)
         {

src/OpenTelemetry.Exporter.Prometheus.HttpListener/Shared/PrometheusExporterEventSource.cs → src/OpenTelemetry.Exporter.Prometheus.HttpListener/Internal/PrometheusExporterEventSource.cs

@@ -18,7 +18,7 @@
 using System.Diagnostics.Tracing;
 using OpenTelemetry.Internal;
 
-namespace OpenTelemetry.Exporter.Prometheus.HttpListener.Shared
+namespace OpenTelemetry.Exporter.Prometheus
 {
     /// <summary>
     /// EventSource events emitted from the project.