Add benchmarks (#2080)

Author: utpilla

opentelemetry/benches/attributes.rs

@@ -1,15 +1,17 @@
 /* OS: Ubuntu 22.04.4 LTS (5.15.153.1-microsoft-standard-WSL2)
 Hardware: Intel(R) Xeon(R) Platinum 8370C CPU @ 2.80GHz, 16vCPUs,
 RAM: 64.0 GB
-| Test                           | Average time|
-|--------------------------------|-------------|
-| CreateOTelKey_Static           |      1.2 ns |
-| CreateOTelKey_Owned            |     12.6 ns |
-| CreateOTelKey_Arc              |    23.35 ns |
-| CreateOTelKeyValue             |     3.24 ns |
-| CreateTupleKeyValue            |      671 ps |
-| CreateOtelKeyValueArray        |     18.4 ns |
-| CreateTupleKeyValueArray       |     2.73 ns |
+| Test                                             | Average time|
+|--------------------------------------------------|-------------|
+| CreateOTelKey_Static                             |      1.2 ns |
+| CreateOTelKey_Owned                              |     12.6 ns |
+| CreateOTelKey_Arc                                |    23.35 ns |
+| CreateOTelKeyValue                               |     3.24 ns |
+| CreateTupleKeyValue                              |      671 ps |
+| CreateOtelKeyValueArray                          |     18.4 ns |
+| CreateOtelKeyValueArrayWithMixedValueTypes       |     18.1 ns |
+| CreateOtelKeyValueArrayWithNonStaticValues       |     90.1 ns |
+| CreateTupleKeyValueArray                         |     2.73 ns |
 */
 
 use criterion::{black_box, criterion_group, criterion_main, Criterion};
@@ -65,6 +67,30 @@ fn attributes_creation(c: &mut Criterion) {
         });
     });
 
+    c.bench_function("CreateOtelKeyValueArrayWithMixedValueTypes", |b| {
+        b.iter(|| {
+            let _v1 = black_box([
+                KeyValue::new("attribute1", true),
+                KeyValue::new("attribute2", 100),
+                KeyValue::new("attribute3", 100.5),
+                KeyValue::new("attribute4", "value"),
+            ]);
+        });
+    });
+
+    let value = "value1value2value3value4".to_owned();
+
+    c.bench_function("CreateOtelKeyValueArrayWithNonStaticValues", |b| {
+        b.iter(|| {
+            let _v1 = black_box([
+                KeyValue::new("attribute1", value[0..6].to_owned()), // value[0..6] = "value1"
+                KeyValue::new("attribute2", value[6..12].to_owned()), // value[6..12] = "value2"
+                KeyValue::new("attribute3", value[12..18].to_owned()), // value[12..18] = "value3"
+                KeyValue::new("attribute4", value[18..24].to_owned()), // value[18..24] = "value4"
+            ]);
+        });
+    });
+
     c.bench_function("CreateTupleKeyValueArray", |b| {
         b.iter(|| {
             let _v1 = black_box([