Expose Resource Monitoring Snapshot API (#5392)

* Expose Snapshot API

* Remove more unnecessary suppressions of S4049

src/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring/ISnapshotProvider.cs

@@ -1,12 +1,16 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Diagnostics.CodeAnalysis;
+using Microsoft.Shared.DiagnosticIds;
+
 namespace Microsoft.Extensions.Diagnostics.ResourceMonitoring;
 
 /// <summary>
 /// An interface to be implemented by a provider that represents an underlying system and gets resources data about it.
 /// </summary>
-internal interface ISnapshotProvider
+[Experimental(diagnosticId: DiagnosticIds.Experiments.ResourceMonitoring, UrlFormat = DiagnosticIds.UrlFormat)]
+public interface ISnapshotProvider
 {
     /// <summary>
     /// Gets the static values of CPU and memory limitations defined by the system.
@@ -17,7 +21,5 @@ internal interface ISnapshotProvider
     /// Get a snapshot of the resource utilization of the system.
     /// </summary>
     /// <returns>An appropriate sample.</returns>
-#pragma warning disable S4049 // Properties should be preferred
     Snapshot GetSnapshot();
-#pragma warning restore S4049 // Properties should be preferred
 }

src/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring/ResourceUtilization.cs

@@ -3,6 +3,7 @@
 
 using System;
 using System.Diagnostics.CodeAnalysis;
+using Microsoft.Shared.DiagnosticIds;
 using Microsoft.Shared.Diagnostics;
 
 namespace Microsoft.Extensions.Diagnostics.ResourceMonitoring;
@@ -41,7 +42,11 @@ public readonly struct ResourceUtilization
     /// </summary>
     public SystemResources SystemResources { get; }
 
-    internal Snapshot Snapshot { get; } = default;
+    /// <summary>
+    /// Gets the latest snapshot of the resource utilization of the system.
+    /// </summary>
+    [Experimental(diagnosticId: DiagnosticIds.Experiments.ResourceMonitoring, UrlFormat = DiagnosticIds.UrlFormat)]
+    public Snapshot Snapshot { get; } = default;
 
     /// <summary>
     /// Initializes a new instance of the <see cref="ResourceUtilization"/> struct.

src/Libraries/Microsoft.Extensions.Diagnostics.ResourceMonitoring/Snapshot.cs

@@ -3,6 +3,7 @@
 
 using System;
 using System.Diagnostics.CodeAnalysis;
+using Microsoft.Shared.DiagnosticIds;
 using Microsoft.Shared.Diagnostics;
 
 namespace Microsoft.Extensions.Diagnostics.ResourceMonitoring;
@@ -11,7 +12,8 @@ namespace Microsoft.Extensions.Diagnostics.ResourceMonitoring;
 /// A snapshot of CPU and memory usage taken periodically over time.
 /// </summary>
 [SuppressMessage("Performance", "CA1815:Override equals and operator equals on value types", Justification = "Comparing instances is not an expected scenario")]
-internal readonly struct Snapshot
+[Experimental(diagnosticId: DiagnosticIds.Experiments.ResourceMonitoring, UrlFormat = DiagnosticIds.UrlFormat)]
+public readonly struct Snapshot
 {
     /// <summary>
     /// Gets the total CPU time that has elapsed since startup.

src/Libraries/Microsoft.Extensions.Options.Contextual/Provider/NullConfigureContextualOptions.cs

@@ -13,7 +13,6 @@ public static class NullConfigureContextualOptions
     /// </summary>
     /// <typeparam name="TOptions">The options type to configure.</typeparam>
     /// <returns>A do-nothing instance of <see cref="IConfigureContextualOptions{TOptions}"/>.</returns>
-    [System.Diagnostics.CodeAnalysis.SuppressMessage("Minor Code Smell", "S4049:Properties should be preferred", Justification = "Not possible for generic methods.")]
     public static IConfigureContextualOptions<TOptions> GetInstance<TOptions>()
         where TOptions : class
         => NullConfigureContextualOptions<TOptions>.Instance;