Use volatile read

andrewlock · andrewlock · commit f8a1a2621619 · 2026-04-10T13:29:22.000+01:00
diff --git a/tracer/src/Datadog.Trace/Agent/StatsAggregator.cs b/tracer/src/Datadog.Trace/Agent/StatsAggregator.cs
@@ -220,7 +220,7 @@ public SpanCollection ProcessTrace(in SpanCollection trace)
         }
 
         public StatsAggregationKey BuildKey(Span span, out List<byte[]> utf8PeerTags)
-            => BuildKey(span, _peerTagKeys, out utf8PeerTags);
+            => BuildKey(span, Volatile.Read(ref _peerTagKeys), out utf8PeerTags);
 
         internal StatsAggregationKey BuildKey(Span span, List<string> peerTagKeys, out List<byte[]> utf8PeerTags)
         {

Original file line number	Diff line number	Diff line change
`@@ -220,7 +220,7 @@ public SpanCollection ProcessTrace(in SpanCollection trace)`
`220`	`220`	`}`
`221`	`221`
`222`	`222`	`public StatsAggregationKey BuildKey(Span span, out List<byte[]> utf8PeerTags)`
`223`		`- => BuildKey(span, _peerTagKeys, out utf8PeerTags);`
	`223`	`+ => BuildKey(span, Volatile.Read(ref _peerTagKeys), out utf8PeerTags);`
`224`	`224`
`225`	`225`	`internal StatsAggregationKey BuildKey(Span span, List<string> peerTagKeys, out List<byte[]> utf8PeerTags)`
`226`	`226`	`{`