backport of commit 2fc8e35

website/content/docs/platform/aws/lambda-extension.mdx

@@ -243,12 +243,16 @@ request will be forwarded to Vault and the response returned and cached.
 Currently, the cache key is a hash of the request URL path, headers, body, and
 token.
 
-<Warning title="Distributed tracing headers may negate the cache">
-
-  The Vault Lambda Extension cache key includes headers from proxy requests. As
-  a result, distributed tracing headers like `traceparent` can lead to
-  individualized hashes that make repeated requests appear unique and cause cache
-  misses.
+<Warning title="Nonstandard distributed tracing headers may negate the cache">
+
+  The Vault Lambda Extension cache key includes headers from proxy requests, but 
+  excludes the standard distributed tracing headers `traceparent` and
+  `tracestate` because trace IDs are unique per request and would lead to unique
+  hashes for repeated requests.
+
+  Some distributed tracing tools may add nonstandard tracing headers, which can 
+  also lead to individualized hashes that make repeated requests unique and 
+  cause cache misses.
 
 </Warning>