finished sections

X-Ray/_X-Ray.md

@@ -69,11 +69,17 @@ Comes with [[_Elastic BeanStalk]] and [[_Lambda]] by default.
     * Named Filter Expressions.
     * Groups only update after you update them, the data before still remains (subsequent traces only)
 
-* **Annotations and Metadata**:
-    * 
+* **Annotations**:
+    * Up to 50 annotations per trace.
+    * Use to record data that you want to group traces in the console, or when calling the `GetTraceSummaries` API.
+ 
+* **Metadata**:
+    * Metadata are not indexed and values can be any type, including lists and objects.
+    * Use Metadata to record data you want to store in the trace but don't need to use for searching traces.
 
 * **Errors, Faults, and Exceptions**:
-    * 
+    * X-Ray records the Stack Trace and exception details if available.
+