Prototype: Complex attributes (Option B)

Author: trask

api/all/src/main/java/io/opentelemetry/api/common/AttributeKey.java

@@ -70,4 +70,16 @@ static AttributeKey<List<Long>> longArrayKey(String key) {
   static AttributeKey<List<Double>> doubleArrayKey(String key) {
     return InternalAttributeKeyImpl.create(key, AttributeType.DOUBLE_ARRAY);
   }
+
+  static AttributeKey<byte[]> byteArrayKey(String key) {
+    return InternalAttributeKeyImpl.create(key, AttributeType.BYTE_ARRAY);
+  }
+
+  static AttributeKey<List<Value<?>>> valueArrayKey(String key) {
+    return InternalAttributeKeyImpl.create(key, AttributeType.VALUE_ARRAY);
+  }
+
+  static AttributeKey<List<KeyValue>> valueMapKey(String key) {
+    return InternalAttributeKeyImpl.create(key, AttributeType.VALUE_MAP);
+  }
 }

api/all/src/main/java/io/opentelemetry/api/common/AttributeType.java

@@ -17,5 +17,8 @@ public enum AttributeType {
   STRING_ARRAY,
   BOOLEAN_ARRAY,
   LONG_ARRAY,
-  DOUBLE_ARRAY
+  DOUBLE_ARRAY,
+  BYTE_ARRAY,
+  VALUE_ARRAY,
+  VALUE_MAP
 }