[Exporter.Prometheus] Add TargetInfoEnabled option

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

@@ -10,6 +10,8 @@ OpenTelemetry.Exporter.PrometheusAspNetCoreOptions.ScrapeEndpointPath.get -> str
 OpenTelemetry.Exporter.PrometheusAspNetCoreOptions.ScrapeEndpointPath.set -> void
 OpenTelemetry.Exporter.PrometheusAspNetCoreOptions.ScrapeResponseCacheDurationMilliseconds.get -> int
 OpenTelemetry.Exporter.PrometheusAspNetCoreOptions.ScrapeResponseCacheDurationMilliseconds.set -> void
+OpenTelemetry.Exporter.PrometheusAspNetCoreOptions.TargetInfoEnabled.get -> bool
+OpenTelemetry.Exporter.PrometheusAspNetCoreOptions.TargetInfoEnabled.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, string? optionsName) -> Microsoft.AspNetCore.Builder.IApplicationBuilder!

src/OpenTelemetry.Exporter.Prometheus.AspNetCore/CHANGELOG.md

@@ -27,6 +27,10 @@ Notes](../../RELEASENOTES.md).
   schemes when negotiated via the `Accept` header.
   ([#7439](https://github.com/open-telemetry/opentelemetry-dotnet/pull/7439))
 
+* Add `PrometheusAspNetCoreOptions.TargetInfoEnabled` property to enable or
+  disable the `target_info` metric in Prometheus metrics. Defaults to `true`.
+  ([#7438](https://github.com/open-telemetry/opentelemetry-dotnet/pull/7438))
+
 ## 1.16.0-beta.1
 
 Released 2026-Jun-10

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

@@ -48,5 +48,15 @@ public int ScrapeResponseCacheDurationMilliseconds
         set => this.ExporterOptions.ScrapeResponseCacheDurationMilliseconds = value;
     }
 
+    /// <summary>
+    /// Gets or sets a value indicating whether to include a <c>target_info</c> metric in the scrape response.
+    /// Default value: <see langword="true"/>.
+    /// </summary>
+    public bool TargetInfoEnabled
+    {
+        get => this.ExporterOptions.TargetInfoEnabled;
+        set => this.ExporterOptions.TargetInfoEnabled = value;
+    }
+
     internal PrometheusExporterOptions ExporterOptions { get; } = new();
 }

src/OpenTelemetry.Exporter.Prometheus.AspNetCore/README.md

@@ -142,6 +142,12 @@ Configures scrape endpoint response caching. Multiple scrape requests within the
 cache duration time period will receive the same previously generated response.
 The default value is `300`. Set to `0` to disable response caching.
 
+### TargetInfoEnabled
+
+Specifies whether to produce a
+[`target_info`](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/compatibility/prometheus_and_openmetrics.md#resource-attributes-1)
+metric. Default value: `true`. Set to `false` to disable the `target_info` metric.
+
 ## Troubleshooting
 
 This component uses an

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

@@ -7,6 +7,8 @@ OpenTelemetry.Exporter.PrometheusHttpListenerOptions.DisableTotalNameSuffixForCo
 OpenTelemetry.Exporter.PrometheusHttpListenerOptions.DisableTotalNameSuffixForCounters.set -> void
 OpenTelemetry.Exporter.PrometheusHttpListenerOptions.ScopeInfoEnabled.get -> bool
 OpenTelemetry.Exporter.PrometheusHttpListenerOptions.ScopeInfoEnabled.set -> void
+OpenTelemetry.Exporter.PrometheusHttpListenerOptions.TargetInfoEnabled.get -> bool
+OpenTelemetry.Exporter.PrometheusHttpListenerOptions.TargetInfoEnabled.set -> void
 OpenTelemetry.Exporter.PrometheusHttpListenerOptions.PrometheusHttpListenerOptions() -> void
 OpenTelemetry.Exporter.PrometheusHttpListenerOptions.ScrapeEndpointPath.get -> string?
 OpenTelemetry.Exporter.PrometheusHttpListenerOptions.ScrapeEndpointPath.set -> void

src/OpenTelemetry.Exporter.Prometheus.HttpListener/CHANGELOG.md

@@ -30,6 +30,10 @@ Notes](../../RELEASENOTES.md).
   schemes when negotiated via the `Accept` header.
   ([#7439](https://github.com/open-telemetry/opentelemetry-dotnet/pull/7439))
 
+* Add `PrometheusHttpListenerOptions.TargetInfoEnabled` property to enable or
+  disable the `target_info` metric in Prometheus metrics. Defaults to `true`.
+  ([#7438](https://github.com/open-telemetry/opentelemetry-dotnet/pull/7438))
+
 ## 1.16.0-beta.1
 
 Released 2026-Jun-10

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

@@ -17,6 +17,7 @@ internal sealed class PrometheusCollectionManager
 
     private readonly PrometheusExporter exporter;
     private readonly bool scopeInfoEnabled;
+    private readonly bool targetInfoEnabled;
     private readonly TimeSpan scrapeResponseCacheDuration;
     private readonly long baseTimestamp = Stopwatch.GetTimestamp();
     private readonly PrometheusExporter.ExportFunc onCollectRef;
@@ -31,6 +32,7 @@ public PrometheusCollectionManager(PrometheusExporter exporter)
     {
         this.exporter = exporter;
         this.scopeInfoEnabled = this.exporter.ScopeInfoEnabled;
+        this.targetInfoEnabled = this.exporter.TargetInfoEnabled;
         this.scrapeResponseCacheDuration = TimeSpan.FromMilliseconds(this.exporter.ScrapeResponseCacheDurationMilliseconds);
         this.onCollectRef = this.OnCollect;
         this.metricsCache = [];
@@ -353,7 +355,7 @@ private bool TryWriteResponse(in PrometheusProtocol protocol, PrometheusProtocol
         {
             var serializer = TextFormatSerializer.GetSerializer(protocol);
 
-            var cursor = this.WriteTargetInfo(serializer, state);
+            var cursor = this.targetInfoEnabled ? this.WriteTargetInfo(serializer, state) : 0;
             var metricStates = this.GetMetricStates(serializer, metrics);
             var options = new TextFormatSerializerOptions(suppressScopeInfo: !this.scopeInfoEnabled);
 

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

@@ -25,6 +25,7 @@ public PrometheusExporter(PrometheusExporterOptions options)
 
         this.ScopeInfoEnabled = options.ScopeInfoEnabled;
         this.ScrapeResponseCacheDurationMilliseconds = options.ScrapeResponseCacheDurationMilliseconds;
+        this.TargetInfoEnabled = options.TargetInfoEnabled;
         this.DisableTotalNameSuffixForCounters = options.DisableTotalNameSuffixForCounters;
 
         this.CollectionManager = new PrometheusCollectionManager(this);
@@ -45,6 +46,8 @@ public PrometheusExporter(PrometheusExporterOptions options)
 
     internal bool ScopeInfoEnabled { get; }
 
+    internal bool TargetInfoEnabled { get; }
+
     internal int ScrapeResponseCacheDurationMilliseconds { get; }
 
     internal bool DisableTotalNameSuffixForCounters { get; }

src/OpenTelemetry.Exporter.Prometheus.HttpListener/Internal/Shared/PrometheusExporterOptions.cs

@@ -14,6 +14,7 @@ public PrometheusExporterOptions()
     {
         this.ScopeInfoEnabled = true;
         this.ScrapeResponseCacheDurationMilliseconds = 300;
+        this.TargetInfoEnabled = true;
     }
 
     /// <summary>
@@ -38,6 +39,12 @@ public int ScrapeResponseCacheDurationMilliseconds
         }
     }
 
+    /// <summary>
+    /// Gets or sets a value indicating whether to include a <c>target_info</c> metric in the scrape response.
+    /// Default value: <see langword="true"/>.
+    /// </summary>
+    public bool TargetInfoEnabled { get; set; }
+
     /// <summary>
     /// Gets or sets a value indicating whether addition of _total suffix for counter metric names is disabled. Default value: <see langword="false"/>.
     /// </summary>

src/OpenTelemetry.Exporter.Prometheus.HttpListener/PrometheusHttpListenerMeterProviderBuilderExtensions.cs

@@ -69,6 +69,7 @@ private static BaseExportingMetricReader BuildPrometheusHttpListenerMetricReader
         {
             ScopeInfoEnabled = options.ScopeInfoEnabled,
             ScrapeResponseCacheDurationMilliseconds = options.ScrapeResponseCacheDurationMilliseconds,
+            TargetInfoEnabled = options.TargetInfoEnabled,
             DisableTotalNameSuffixForCounters = options.DisableTotalNameSuffixForCounters,
         });
 

src/OpenTelemetry.Exporter.Prometheus.HttpListener/PrometheusHttpListenerOptions.cs

@@ -93,5 +93,11 @@ public int ScrapeResponseCacheDurationMilliseconds
         }
     }
 
+    /// <summary>
+    /// Gets or sets a value indicating whether to include a <c>target_info</c> metric in the scrape response.
+    /// Default value: <see langword="true"/>.
+    /// </summary>
+    public bool TargetInfoEnabled { get; set; } = true;
+
     internal Action<PrometheusHttpListenerOptions, System.Net.HttpListener>? ConfigureHttpListener { get; set; }
 }

src/OpenTelemetry.Exporter.Prometheus.HttpListener/README.md

@@ -63,6 +63,7 @@ variables.
 * `ScopeInfoEnabled`: Whether to include scope labels in metrics (default `true`).
 * `ScrapeEndpointPath`: Defines the Prometheus scrape endpoint path.
   (default `"/metrics"`).
+* `TargetInfoEnabled`: Whether to produce a `target_info` metric (default `true`).
 * `DisableTotalNameSuffixForCounters`: Whether to disable the `_total` suffix for
   counter metrics (default `false`).
 * `DisableTimestamp`: Whether to disable the timestamp for metrics (default `false`).
@@ -108,6 +109,12 @@ Configures scrape endpoint response caching. Multiple scrape requests within the
 cache duration time period will receive the same previously generated response.
 The default value is `300`. Set to `0` to disable response caching.
 
+### TargetInfoEnabled
+
+Specifies whether to produce a
+[`target_info`](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/compatibility/prometheus_and_openmetrics.md#resource-attributes-1)
+metric. Default value: `true`. Set to `false` to disable the `target_info` metric.
+
 ## Troubleshooting
 
 This component uses an

test/OpenTelemetry.Exporter.Prometheus.AspNetCore.Tests/PrometheusExporterMiddlewareTests.cs

@@ -48,6 +48,20 @@ public async Task RunWithScopeInfoEnabledConfigured(bool scopeInfoEnabled)
         await Verify(output, "text", PrometheusSerializerTests.VerifySettings).UseParameters(scopeInfoEnabled);
     }
 
+    [Theory]
+    [InlineData(true)]
+    [InlineData(false)]
+    public async Task RunWithTargetInfoEnabledConfigured(bool targetInfoEnabled)
+    {
+        var output = await RunPrometheusExporterMiddlewareIntegrationTest(
+            "/metrics",
+            app => app.UseOpenTelemetryPrometheusScrapingEndpoint(),
+            services => services.Configure<PrometheusAspNetCoreOptions>(o => o.TargetInfoEnabled = targetInfoEnabled),
+            assertResponseContent: false);
+
+        await Verify(output, "text", PrometheusSerializerTests.VerifySettings).UseParameters(targetInfoEnabled);
+    }
+
     [Fact]
     public async Task RunWithCustomScrapeEndpointPath()
     {

test/OpenTelemetry.Exporter.Prometheus.HttpListener.Tests/PrometheusHttpListenerTests.cs

@@ -46,6 +46,22 @@ public async Task RunHttpServerWithScopeInfoEnabledConfigured(bool scopeInfoEnab
         await Verify(output, "text", PrometheusSerializerTests.VerifySettings).UseParameters(scopeInfoEnabled);
     }
 
+    [Theory]
+    [InlineData(true)]
+    [InlineData(false)]
+    public async Task RunHttpServerWithTargetInfoEnabledConfigured(bool targetInfoEnabled)
+    {
+        var output = await RunPrometheusExporterHttpServerIntegrationTest(
+            configureListener: (options) =>
+            {
+                options.TargetInfoEnabled = targetInfoEnabled;
+                return options.Port;
+            },
+            assertResponseContent: false);
+
+        await Verify(output, "text", PrometheusSerializerTests.VerifySettings).UseParameters(targetInfoEnabled);
+    }
+
     [Fact]
     public async Task RunHttpServerWithNoMetrics()
     {

test/OpenTelemetry.Exporter.Prometheus.HttpListener.Tests/snapshots/PrometheusSerializer.RunHttpServerWithTargetInfoEnabledConfigured_targetInfoEnabled=False.verified.text

@@ -0,0 +1,5 @@
+# TYPE counter_double_bytes counter
+# UNIT counter_double_bytes bytes
+counter_double_bytes_total{otel_scope_name="PrometheusHttpListenerTests",otel_scope_version="1.0.1",key1="value1",key2="value2"} 101.17
+counter_double_bytes_created{otel_scope_name="PrometheusHttpListenerTests",otel_scope_version="1.0.1",key1="value1",key2="value2"} <TIMESTAMP>
+# EOF

test/OpenTelemetry.Exporter.Prometheus.HttpListener.Tests/snapshots/PrometheusSerializer.RunHttpServerWithTargetInfoEnabledConfigured_targetInfoEnabled=True.verified.text

@@ -0,0 +1,8 @@
+# TYPE target info
+# HELP target Target metadata
+target_info{service_name="my_service",service_instance_id="id1"} 1
+# TYPE counter_double_bytes counter
+# UNIT counter_double_bytes bytes
+counter_double_bytes_total{otel_scope_name="PrometheusHttpListenerTests",otel_scope_version="1.0.1",key1="value1",key2="value2"} 101.17
+counter_double_bytes_created{otel_scope_name="PrometheusHttpListenerTests",otel_scope_version="1.0.1",key1="value1",key2="value2"} <TIMESTAMP>
+# EOF

test/OpenTelemetry.Exporter.Prometheus.HttpListener.Tests/snapshots/PrometheusSerializer.RunWithTargetInfoEnabledConfigured_targetInfoEnabled=False.verified.text

@@ -0,0 +1,5 @@
+# TYPE counter_double_bytes counter
+# UNIT counter_double_bytes bytes
+counter_double_bytes_total{otel_scope_name="PrometheusExporterMiddlewareTests",otel_scope_version="1.0.1",key1="value1",key2="value2"} 101.17
+counter_double_bytes_created{otel_scope_name="PrometheusExporterMiddlewareTests",otel_scope_version="1.0.1",key1="value1",key2="value2"} <TIMESTAMP>
+# EOF

test/OpenTelemetry.Exporter.Prometheus.HttpListener.Tests/snapshots/PrometheusSerializer.RunWithTargetInfoEnabledConfigured_targetInfoEnabled=True.verified.text

@@ -0,0 +1,8 @@
+# TYPE target info
+# HELP target Target metadata
+target_info{service_name="my_service",service_instance_id="id1"} 1
+# TYPE counter_double_bytes counter
+# UNIT counter_double_bytes bytes
+counter_double_bytes_total{otel_scope_name="PrometheusExporterMiddlewareTests",otel_scope_version="1.0.1",key1="value1",key2="value2"} 101.17
+counter_double_bytes_created{otel_scope_name="PrometheusExporterMiddlewareTests",otel_scope_version="1.0.1",key1="value1",key2="value2"} <TIMESTAMP>
+# EOF