[Exporter.Prometheus] Add TargetInfoEnabled option

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

@@ -4,10 +4,14 @@ OpenTelemetry.Exporter.PrometheusAspNetCoreOptions
 OpenTelemetry.Exporter.PrometheusAspNetCoreOptions.DisableTotalNameSuffixForCounters.get -> bool
 OpenTelemetry.Exporter.PrometheusAspNetCoreOptions.DisableTotalNameSuffixForCounters.set -> void
 OpenTelemetry.Exporter.PrometheusAspNetCoreOptions.PrometheusAspNetCoreOptions() -> void
+OpenTelemetry.Exporter.PrometheusAspNetCoreOptions.ScopeInfoEnabled.get -> bool
+OpenTelemetry.Exporter.PrometheusAspNetCoreOptions.ScopeInfoEnabled.set -> void
 OpenTelemetry.Exporter.PrometheusAspNetCoreOptions.ScrapeEndpointPath.get -> string?
 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

@@ -10,6 +10,14 @@ Notes](../../RELEASENOTES.md).
 * Added a verbose-level diagnostic event for ignored metrics.
   ([#7429](https://github.com/open-telemetry/opentelemetry-dotnet/pull/7429))
 
+* Add `PrometheusAspNetCoreOptions.ScopeInfoEnabled` property to enable or
+  disable scope labels in Prometheus metrics. Defaults to `true`.
+  ([#7436](https://github.com/open-telemetry/opentelemetry-dotnet/pull/7436))
+
+* Add `PrometheusAspNetCoreOptions.TargetInfoEnabled` property to enable or
+  disable the `target_info` metric in Prometheus metrics. Defaults to `true`.
+  ([#TODO](https://github.com/open-telemetry/opentelemetry-dotnet/pull/TODO))
+
 ## 1.16.0-beta.1
 
 Released 2026-Jun-10

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

@@ -26,6 +26,16 @@ public bool DisableTotalNameSuffixForCounters
         set => this.ExporterOptions.DisableTotalNameSuffixForCounters = value;
     }
 
+    /// <summary>
+    /// Gets or sets a value indicating whether the scope information (name, version, schema URL) is added to the scrape response.
+    /// Default value: <see langword="true"/>.
+    /// </summary>
+    public bool ScopeInfoEnabled
+    {
+        get => this.ExporterOptions.ScopeInfoEnabled;
+        set => this.ExporterOptions.ScopeInfoEnabled = value;
+    }
+
     /// <summary>
     /// Gets or sets the cache duration in milliseconds for scrape responses. Default value: 300.
     /// </summary>
@@ -38,5 +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

@@ -124,6 +124,12 @@ to expose the scraping endpoint on a different port.
 The `PrometheusExporter` can be configured using the `PrometheusAspNetCoreOptions`
 properties.
 
+### ScopeInfoEnabled
+
+Specifies whether metrics include
+[scope labels](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/compatibility/prometheus_and_openmetrics.md#instrumentation-scope-1).
+Default value: `true`. Set to `false` to disable scope labels.
+
 ### ScrapeEndpointPath
 
 Defines the path for the Prometheus scrape endpoint for the middleware
@@ -136,6 +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

@@ -5,6 +5,10 @@ OpenTelemetry.Exporter.PrometheusHttpListenerOptions.Port.get -> int
 OpenTelemetry.Exporter.PrometheusHttpListenerOptions.Port.set -> void
 OpenTelemetry.Exporter.PrometheusHttpListenerOptions.DisableTotalNameSuffixForCounters.get -> bool
 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.UriPrefixes.get -> System.Collections.Generic.IReadOnlyCollection<string!>!
 OpenTelemetry.Exporter.PrometheusHttpListenerOptions.UriPrefixes.set -> void
 OpenTelemetry.Exporter.PrometheusHttpListenerOptions.PrometheusHttpListenerOptions() -> void

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

@@ -10,6 +10,14 @@ Notes](../../RELEASENOTES.md).
 * Added a verbose-level diagnostic event for ignored metrics.
   ([#7429](https://github.com/open-telemetry/opentelemetry-dotnet/pull/7429))
 
+* Add `PrometheusHttpListenerOptions.ScopeInfoEnabled` property to enable or
+  disable scope labels in Prometheus metrics. Defaults to `true`.
+  ([#7436](https://github.com/open-telemetry/opentelemetry-dotnet/pull/7436))
+
+* Add `PrometheusHttpListenerOptions.TargetInfoEnabled` property to enable or
+  disable the `target_info` metric in Prometheus metrics. Defaults to `true`.
+  ([#TODO](https://github.com/open-telemetry/opentelemetry-dotnet/pull/TODO))
+
 ## 1.16.0-beta.1
 
 Released 2026-Jun-10

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

@@ -16,6 +16,8 @@ internal sealed class PrometheusCollectionManager
     private readonly ConcurrentDictionary<PrometheusProtocol, PrometheusProtocolState> protocolStates = new();
 
     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;
@@ -29,6 +31,8 @@ internal sealed class PrometheusCollectionManager
     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 = [];
@@ -351,8 +355,9 @@ private bool TryWriteResponse(PrometheusProtocol protocol, PrometheusProtocolSta
         {
             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);
 
             foreach (var metricState in metricStates)
             {
@@ -369,7 +374,8 @@ private bool TryWriteResponse(PrometheusProtocol protocol, PrometheusProtocolSta
                             metricState.WriteUnit,
                             metricState.WriteHelp,
                             metricState.Unit,
-                            metricState.Help);
+                            metricState.Help,
+                            options);
 
                         break;
                     }

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

@@ -23,7 +23,9 @@ public PrometheusExporter(PrometheusExporterOptions options)
     {
         Guard.ThrowIfNull(options);
 
+        this.ScopeInfoEnabled = options.ScopeInfoEnabled;
         this.ScrapeResponseCacheDurationMilliseconds = options.ScrapeResponseCacheDurationMilliseconds;
+        this.TargetInfoEnabled = options.TargetInfoEnabled;
         this.DisableTotalNameSuffixForCounters = options.DisableTotalNameSuffixForCounters;
 
         this.CollectionManager = new PrometheusCollectionManager(this);
@@ -42,6 +44,10 @@ public PrometheusExporter(PrometheusExporterOptions options)
 
     internal PrometheusCollectionManager CollectionManager { get; }
 
+    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

@@ -12,9 +12,17 @@ internal sealed class PrometheusExporterOptions
 {
     public PrometheusExporterOptions()
     {
+        this.ScopeInfoEnabled = true;
         this.ScrapeResponseCacheDurationMilliseconds = 300;
+        this.TargetInfoEnabled = true;
     }
 
+    /// <summary>
+    /// Gets or sets a value indicating whether the scope information (name, version, schema URL) is added to the scrape response.
+    /// Default value: <see langword="true"/>.
+    /// </summary>
+    public bool ScopeInfoEnabled { get; set; }
+
     /// <summary>
     /// Gets or sets the cache duration in milliseconds for scrape responses. Default value: 300.
     /// </summary>
@@ -31,6 +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/Internal/Shared/Serialization/OpenMetricsSerializer.cs

@@ -52,7 +52,12 @@ protected override int WriteExplicitBound(byte[] buffer, int cursor, double expl
     protected override bool ShouldWriteSumAndCount(bool hasNegativeBucketBounds)
         => !hasNegativeBucketBounds;
 
-    protected override int WriteCounterExemplar(byte[] buffer, int cursor, in MetricPoint metricPoint, PrometheusMetric prometheusMetric, bool isLongValue)
+    protected override int WriteCounterExemplar(
+        byte[] buffer,
+        int cursor,
+        in MetricPoint metricPoint,
+        PrometheusMetric prometheusMetric,
+        bool isLongValue)
     {
         if (prometheusMetric.Type == PrometheusType.Counter &&
             TryGetLatestExemplar(metricPoint, out var exemplar))
@@ -63,11 +68,17 @@ protected override int WriteCounterExemplar(byte[] buffer, int cursor, in Metric
         return cursor;
     }
 
-    protected override int WriteCounterCreated(byte[] buffer, int cursor, Metric metric, PrometheusMetric prometheusMetric, in MetricPoint metricPoint)
+    protected override int WriteCounterCreated(
+        byte[] buffer,
+        int cursor,
+        Metric metric,
+        PrometheusMetric prometheusMetric,
+        in MetricPoint metricPoint,
+        in TextFormatSerializerOptions options)
     {
         if (prometheusMetric.Type == PrometheusType.Counter)
         {
-            cursor = this.WriteCreatedMetric(buffer, cursor, metric, prometheusMetric, metricPoint);
+            cursor = this.WriteCreatedMetric(buffer, cursor, metric, prometheusMetric, metricPoint, options);
         }
 
         return cursor;
@@ -83,8 +94,8 @@ protected override int WriteHistogramBucketExemplar(byte[] buffer, int cursor, i
         return cursor;
     }
 
-    protected override int WriteHistogramCreated(byte[] buffer, int cursor, Metric metric, PrometheusMetric prometheusMetric, in MetricPoint metricPoint)
-        => this.WriteCreatedMetric(buffer, cursor, metric, prometheusMetric, metricPoint, ReservedHistogramLabelNames);
+    protected override int WriteHistogramCreated(byte[] buffer, int cursor, Metric metric, PrometheusMetric prometheusMetric, in MetricPoint metricPoint, in TextFormatSerializerOptions options)
+        => this.WriteCreatedMetric(buffer, cursor, metric, prometheusMetric, metricPoint, options, ReservedHistogramLabelNames);
 
     private static bool TryGetLatestExemplar(in MetricPoint metricPoint, out Exemplar exemplar)
     {
@@ -150,12 +161,13 @@ private int WriteCreatedMetric(
         Metric metric,
         PrometheusMetric prometheusMetric,
         in MetricPoint metricPoint,
+        in TextFormatSerializerOptions options,
         IReadOnlyCollection<string>? reservedOutputKeys = null)
     {
         cursor = this.WriteMetricMetadataName(buffer, cursor, prometheusMetric);
 
         cursor = WriteAsciiStringNoEscape(buffer, cursor, "_created");
-        cursor = WriteTags(buffer, cursor, metric, metricPoint.Tags, reservedOutputKeys: reservedOutputKeys);
+        cursor = WriteTags(buffer, cursor, metric, metricPoint.Tags, options, reservedOutputKeys: reservedOutputKeys);
 
         buffer[cursor++] = unchecked((byte)' ');
 

src/OpenTelemetry.Exporter.Prometheus.HttpListener/Internal/Shared/Serialization/PrometheusTextSerializer.cs

@@ -38,12 +38,12 @@ protected override bool ShouldWriteSumAndCount(bool hasNegativeBucketBounds)
     protected override int WriteCounterExemplar(byte[] buffer, int cursor, in MetricPoint metricPoint, PrometheusMetric prometheusMetric, bool isLongValue)
         => cursor;
 
-    protected override int WriteCounterCreated(byte[] buffer, int cursor, Metric metric, PrometheusMetric prometheusMetric, in MetricPoint metricPoint)
+    protected override int WriteCounterCreated(byte[] buffer, int cursor, Metric metric, PrometheusMetric prometheusMetric, in MetricPoint metricPoint, in TextFormatSerializerOptions options)
         => cursor;
 
     protected override int WriteHistogramBucketExemplar(byte[] buffer, int cursor, in MetricPoint metricPoint, double lowerBoundExclusive, double upperBoundInclusive)
         => cursor;
 
-    protected override int WriteHistogramCreated(byte[] buffer, int cursor, Metric metric, PrometheusMetric prometheusMetric, in MetricPoint metricPoint)
+    protected override int WriteHistogramCreated(byte[] buffer, int cursor, Metric metric, PrometheusMetric prometheusMetric, in MetricPoint metricPoint, in TextFormatSerializerOptions options)
         => cursor;
 }