[Metrics API] Remove unnecessary auto trait implementations

opentelemetry-sdk/src/metrics/mod.rs

@@ -104,7 +104,7 @@ fn calculate_hash(values: &[KeyValue]) -> u64 {
 
 impl AttributeSet {
     fn new(mut values: Vec<KeyValue>) -> Self {
-        values.sort_unstable();
+        values.sort_unstable_by(|a, b| a.key.cmp(&b.key));
         let hash = calculate_hash(&values);
         AttributeSet(values, hash)
     }

opentelemetry/src/metrics/mod.rs

@@ -1,6 +1,5 @@
 //! # OpenTelemetry Metrics API
 
-use std::cmp::Ordering;
 use std::hash::{Hash, Hasher};
 use std::result;
 use std::sync::Arc;
@@ -91,19 +90,6 @@ impl Hash for KeyValue {
     }
 }
 
-impl PartialOrd for KeyValue {
-    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
-        Some(self.cmp(other))
-    }
-}
-
-/// Ordering is based on the key only.
-impl Ord for KeyValue {
-    fn cmp(&self, other: &Self) -> Ordering {
-        self.key.cmp(&other.key)
-    }
-}
-
 impl Eq for KeyValue {}
 
 /// SDK implemented trait for creating instruments
@@ -300,27 +286,6 @@ mod tests {
         }
     }
 
-    #[test]
-    fn kv_float_order() {
-        // TODO: Extend this test to all value types, not just F64
-        let float_vals = [
-            0.0,
-            1.0,
-            -1.0,
-            f64::INFINITY,
-            f64::NEG_INFINITY,
-            f64::NAN,
-            f64::MIN,
-            f64::MAX,
-        ];
-
-        for v in float_vals {
-            let kv1 = KeyValue::new("a", v);
-            let kv2 = KeyValue::new("b", v);
-            assert!(kv1 < kv2, "Order is solely based on key!");
-        }
-    }
-
     fn hash_helper<T: Hash>(item: &T) -> u64 {
         let mut hasher = DefaultHasher::new();
         item.hash(&mut hasher);