From dbd3ecb74cdad68d1efe3f0024cc3551f502a4c3 Mon Sep 17 00:00:00 2001
From: Duncan Harvey <duncan.harvey@datadoghq.com>
Date: Tue, 28 Apr 2026 10:27:02 -0400
Subject: [PATCH 1/2] add hash trait to tracer metadata

---
 libdd-library-config/src/tracer_metadata.rs | 30 ++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/libdd-library-config/src/tracer_metadata.rs b/libdd-library-config/src/tracer_metadata.rs
index f84cb24478..5b76536685 100644
--- a/libdd-library-config/src/tracer_metadata.rs
+++ b/libdd-library-config/src/tracer_metadata.rs
@@ -4,7 +4,7 @@ use libdd_trace_protobuf::opentelemetry::proto as otel_proto;
 use std::default::Default;
 
 /// This struct MUST be backward compatible.
-#[derive(serde::Serialize, Debug, PartialEq, Eq)]
+#[derive(serde::Serialize, Debug, PartialEq, Eq, Hash)]
 pub struct TracerMetadata {
     /// Version of the schema.
     pub schema_version: u8,
@@ -247,6 +247,34 @@ mod tests {
             .as_ref()
     }
 
+    #[test]
+    fn tracer_metadata_hash() {
+        use std::collections::hash_map::DefaultHasher;
+        use std::hash::{Hash, Hasher};
+
+        fn hash(m: &TracerMetadata) -> u64 {
+            let mut h = DefaultHasher::new();
+            m.hash(&mut h);
+            h.finish()
+        }
+
+        let a = TracerMetadata {
+            tracer_language: "python".into(),
+            ..Default::default()
+        };
+        let b = TracerMetadata {
+            tracer_language: "python".into(),
+            ..Default::default()
+        };
+        let c = TracerMetadata {
+            tracer_language: "ruby".into(),
+            ..Default::default()
+        };
+
+        assert_eq!(hash(&a), hash(&b));
+        assert_ne!(hash(&a), hash(&c));
+    }
+
     #[test]
     fn tracer_metadata_equality() {
         let a = TracerMetadata {

From b04a4bb50e5b29ae3dbddd6cce0c571024cbe029 Mon Sep 17 00:00:00 2001
From: Duncan Harvey <35278470+duncanpharvey@users.noreply.github.com>
Date: Tue, 28 Apr 2026 11:50:48 -0400
Subject: [PATCH 2/2] remove hash test from TracerMetadata

Co-authored-by: Yann Hamdaoui <yann.hamdaoui@gmail.com>
---
 libdd-library-config/src/tracer_metadata.rs | 28 ---------------------
 1 file changed, 28 deletions(-)

diff --git a/libdd-library-config/src/tracer_metadata.rs b/libdd-library-config/src/tracer_metadata.rs
index 5b76536685..03d0ae9b4c 100644
--- a/libdd-library-config/src/tracer_metadata.rs
+++ b/libdd-library-config/src/tracer_metadata.rs
@@ -247,34 +247,6 @@ mod tests {
             .as_ref()
     }
 
-    #[test]
-    fn tracer_metadata_hash() {
-        use std::collections::hash_map::DefaultHasher;
-        use std::hash::{Hash, Hasher};
-
-        fn hash(m: &TracerMetadata) -> u64 {
-            let mut h = DefaultHasher::new();
-            m.hash(&mut h);
-            h.finish()
-        }
-
-        let a = TracerMetadata {
-            tracer_language: "python".into(),
-            ..Default::default()
-        };
-        let b = TracerMetadata {
-            tracer_language: "python".into(),
-            ..Default::default()
-        };
-        let c = TracerMetadata {
-            tracer_language: "ruby".into(),
-            ..Default::default()
-        };
-
-        assert_eq!(hash(&a), hash(&b));
-        assert_ne!(hash(&a), hash(&c));
-    }
-
     #[test]
     fn tracer_metadata_equality() {
         let a = TracerMetadata {