[sdk-traces] SamplingResult constructors accept null parameters (#5614)

Author: Kielek

src/OpenTelemetry/.publicApi/Stable/PublicAPI.Shipped.txt

@@ -315,8 +315,8 @@ OpenTelemetry.Trace.SamplingResult.Equals(OpenTelemetry.Trace.SamplingResult oth
 OpenTelemetry.Trace.SamplingResult.SamplingResult() -> void
 OpenTelemetry.Trace.SamplingResult.SamplingResult(bool isSampled) -> void
 OpenTelemetry.Trace.SamplingResult.SamplingResult(OpenTelemetry.Trace.SamplingDecision decision) -> void
-OpenTelemetry.Trace.SamplingResult.SamplingResult(OpenTelemetry.Trace.SamplingDecision decision, string! traceStateString) -> void
-OpenTelemetry.Trace.SamplingResult.SamplingResult(OpenTelemetry.Trace.SamplingDecision decision, System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string!, object!>>! attributes) -> void
+OpenTelemetry.Trace.SamplingResult.SamplingResult(OpenTelemetry.Trace.SamplingDecision decision, string? traceStateString) -> void
+OpenTelemetry.Trace.SamplingResult.SamplingResult(OpenTelemetry.Trace.SamplingDecision decision, System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string!, object!>>? attributes) -> void
 OpenTelemetry.Trace.SamplingResult.SamplingResult(OpenTelemetry.Trace.SamplingDecision decision, System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string!, object!>>? attributes, string? traceStateString) -> void
 OpenTelemetry.Trace.SamplingResult.TraceStateString.get -> string?
 OpenTelemetry.Trace.TraceIdRatioBasedSampler

src/OpenTelemetry/CHANGELOG.md

@@ -25,6 +25,11 @@
   supported in stable builds.
   ([#5607](https://github.com/open-telemetry/opentelemetry-dotnet/pull/5607))
 
+* Fixed the nullable annotations for the `SamplingResult` constructors
+  to allow `null` being supplied as `attributes` or `traceStateString`
+  which has always been supported.
+  ([#5614](https://github.com/open-telemetry/opentelemetry-dotnet/pull/5614))
+
 ## 1.8.1
 
 Released 2024-Apr-17

src/OpenTelemetry/Trace/SamplingResult.cs

@@ -32,7 +32,7 @@ public SamplingResult(bool isSampled)
     /// <param name="decision">indicates whether an activity object is recorded and sampled.</param>
     /// <param name="attributes">Attributes associated with the sampling decision. Attributes list passed to
     /// this method must be immutable. Mutations of the collection and/or attribute values may lead to unexpected behavior.</param>
-    public SamplingResult(SamplingDecision decision, IEnumerable<KeyValuePair<string, object>> attributes)
+    public SamplingResult(SamplingDecision decision, IEnumerable<KeyValuePair<string, object>>? attributes)
         : this(decision, attributes, traceStateString: null)
     {
     }
@@ -42,7 +42,7 @@ public SamplingResult(SamplingDecision decision, IEnumerable<KeyValuePair<string
     /// </summary>
     /// <param name="decision">indicates whether an activity object is recorded and sampled.</param>
     /// <param name="traceStateString">traceStateString associated with the created Activity.</param>
-    public SamplingResult(SamplingDecision decision, string traceStateString)
+    public SamplingResult(SamplingDecision decision, string? traceStateString)
         : this(decision, attributes: null, traceStateString)
     {
     }
@@ -67,7 +67,7 @@ public SamplingResult(SamplingDecision decision, IEnumerable<KeyValuePair<string
     }
 
     /// <summary>
-    /// Gets a value indicating indicates whether an activity object is recorded and sampled.
+    /// Gets a value indicating whether an activity object is recorded and sampled.
     /// </summary>
     public SamplingDecision Decision { get; }