attribute: add String method for Value type

CHANGELOG.md

@@ -11,6 +11,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 ### Added
 
 - Add `ByteSlice` and `ByteSliceValue` functions for new `BYTESLICE` attribute type in `go.opentelemetry.io/otel/attribute`. (#7948)
+- Add `String` method for `Value` type in `go.opentelemetry.io/otel/attribute`. (#8142)
 - Add `Error` field on `Record` type in `go.opentelemetry.io/otel/log/logtest`. (#8148)
 
 ### Changed

attribute/benchmark_test.go

@@ -34,6 +34,15 @@ func benchmarkEmit(kv attribute.KeyValue) func(*testing.B) {
 	}
 }
 
+func benchmarkString(kv attribute.KeyValue) func(*testing.B) {
+	return func(b *testing.B) {
+		b.ReportAllocs()
+		for i := 0; i < b.N; i++ {
+			outStr = kv.Value.String()
+		}
+	}
+}
+
 func BenchmarkBool(b *testing.B) {
 	k, v := "bool", true
 	kv := attribute.Bool(k, v)
@@ -56,6 +65,7 @@ func BenchmarkBool(b *testing.B) {
 			outBool = kv.Value.AsBool()
 		}
 	})
+	b.Run("String", benchmarkString(kv))
 	b.Run("Emit", benchmarkEmit(kv))
 }
 
@@ -89,6 +99,7 @@ func BenchmarkBoolSlice(b *testing.B) {
 					outBoolSlice = kv.Value.AsBoolSlice()
 				}
 			})
+			b.Run("String", benchmarkString(kv))
 			b.Run("Emit", benchmarkEmit(kv))
 		})
 	}
@@ -110,6 +121,7 @@ func BenchmarkInt(b *testing.B) {
 			outKV = attribute.Int(k, v)
 		}
 	})
+	b.Run("String", benchmarkString(kv))
 	b.Run("Emit", benchmarkEmit(kv))
 }
 
@@ -137,6 +149,7 @@ func BenchmarkIntSlice(b *testing.B) {
 					outKV = attribute.IntSlice(k, v)
 				}
 			})
+			b.Run("String", benchmarkString(kv))
 			b.Run("Emit", benchmarkEmit(kv))
 		})
 	}
@@ -164,6 +177,7 @@ func BenchmarkInt64(b *testing.B) {
 			outInt64 = kv.Value.AsInt64()
 		}
 	})
+	b.Run("String", benchmarkString(kv))
 	b.Run("Emit", benchmarkEmit(kv))
 }
 
@@ -197,6 +211,7 @@ func BenchmarkInt64Slice(b *testing.B) {
 					outInt64Slice = kv.Value.AsInt64Slice()
 				}
 			})
+			b.Run("String", benchmarkString(kv))
 			b.Run("Emit", benchmarkEmit(kv))
 		})
 	}
@@ -224,6 +239,7 @@ func BenchmarkFloat64(b *testing.B) {
 			outFloat64 = kv.Value.AsFloat64()
 		}
 	})
+	b.Run("String", benchmarkString(kv))
 	b.Run("Emit", benchmarkEmit(kv))
 }
 
@@ -257,6 +273,7 @@ func BenchmarkFloat64Slice(b *testing.B) {
 					outFloat64Slice = kv.Value.AsFloat64Slice()
 				}
 			})
+			b.Run("String", benchmarkString(kv))
 			b.Run("Emit", benchmarkEmit(kv))
 		})
 	}
@@ -284,6 +301,7 @@ func BenchmarkString(b *testing.B) {
 			outStr = kv.Value.AsString()
 		}
 	})
+	b.Run("String", benchmarkString(kv))
 	b.Run("Emit", benchmarkEmit(kv))
 }
 
@@ -317,6 +335,7 @@ func BenchmarkStringSlice(b *testing.B) {
 					outStrSlice = kv.Value.AsStringSlice()
 				}
 			})
+			b.Run("String", benchmarkString(kv))
 			b.Run("Emit", benchmarkEmit(kv))
 		})
 	}
@@ -347,6 +366,7 @@ func BenchmarkByteSlice(b *testing.B) {
 		}
 	})
 
+	b.Run("String", benchmarkString(kv))
 	b.Run("Emit", benchmarkEmit(kv))
 }