Merge pull request #4733 from segmentio/bill-wilkin-patch-2

Update profile-api-limits.md with additional limitations

src/unify/profile-api-limits.md

@@ -5,6 +5,7 @@ redirect_from:
   - '/profiles/product-limits'
 ---
 
+
 ## Profile API
 
 | Name                    | limit                   | Details                                                                                                                                                             |
@@ -20,3 +21,11 @@ redirect_from:
 | Identity Merges   | 100 merges    | Engage supports up to 100 merges per profile in its identity graph. Merges occur when a common `external_id` joins two existing profiles. For example, if a user initiates a mobile session but then signs in through a web application, a common identifier like `user_id` will join the two user profiles. No additional merges will be added once the profile reaches this limit. Event resolution for the profile, however, will continue. |
 | Identity Mappings | 1000 mappings | Engage supports up to 1000 mappings per profile in its identity graph. Mappings are external identifier values like a `user_id`, email, mobile advertising `id`, or any custom identifier. No additional mappings will be added once the profile reaches this limit. Event resolution for the profile, however, will continue.                                                                                                                 |
 | Identify calls    | 300 traits    | Engage rejects Identify events with 300 or more traits. If your use case requires more than 300 traits, you can split the traits into multiple Identify calls.                                                                                                                                                                                                                                                                                 |
+
+### Unify ingestion limitations
+
+Unify will silently drop events if:
+- The groupId has more than 500 characters.
+- Events have more than 300 properties/traits.
+- messageId is longer than 100 characters.
+- The groupId is empty in a group call or context.groupId is empty in a track call.