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Merge pull request segmentio#3907 from segmentio/events-at-limits-updates
Add Events at Limits Updates
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‎src/engage/faqs.md

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@@ -66,14 +66,14 @@ The audience in the image below includes all users that have Product Added in th
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> info ""
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> Funnel Audiences compute based on all instances of the parent event within the lookback period. This means that if you have a user that Product Added ⟶ Order Completed ⟶ Product Added, this user would be entered into the Abandoned Cart state despite having previously completed an order.
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<!--PW 9/6/22 ## What is Engage Merge Protection?
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## What is Engage Merge Protection?
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Engage merge protection algorithm protects your identity graph from unnecessary merges by finding and removing untrusted external IDs. Here's an example:
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![Merge protection](images/merge_protection.png "An image representing the merge protection flow")
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In this example, `anonymous_id: a1` is not reset during a `User Logout`. Without merge protection rules, Segment would merge `user_id u1` and `user_id u2`. Instead, the identity resolution algorithm detects that such a merge would break `user_id` uniqueness and prevents the merge.
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This is especially helpful for preventing "blob users" that are merged together by non-unique anonymous IDs or by common group emails like `[email protected]`. -->
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This is especially helpful for preventing "blob users" that are merged together by non-unique anonymous IDs or by common group emails like `[email protected]`.
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## Which destinations support syncing the identity graph?
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Most destinations on the Segment Platform are built up around a user model. They assume that a user will have a single userId. Further, most Destinations are not built to handle anonymous traffic.

‎src/profiles/faqs.md

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If you want Identity Graph to operate on a different custom ID, you can pass it in using `context.externalIds` on an `identify()` or `track()`. If you're interested in this feature, contact your CSM to discuss the best way to implement this feature.
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<!--PW 9/6/22
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## How does Profiles handle identity merging?
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Each incoming event is analyzed and external IDs are extracted (`user_id`, `anonymous_id`, `email`). The simplified algorithm works as follows:
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4. If Segment finds multiple matching profiles, Segment applies the identity resolution settings for merge protection. Specifically, Segment uses identifier limits and priorities to add the correct identifiers to the profile.
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5. Segment then applies [Profile limits](/docs/profiles/profile-api-limits/) to ensure profiles remain under these limits. Segment doesn't add any further merges or mappings if the profile is at either limit, but event resolution for the profile will continue.
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{% comment %}
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![Identity graph merging](images/merging_1.png "Flowchart of Segment receiving an incoming event")
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![Identity graph merging](images/merging_2.png "Flowchart of Segment searching for profiles by external ID")
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![Identity graph merging](images/merging_3.png "Flowchart of Segment merging profiles") -->
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![Identity graph merging](images/merging_3.png "Flowchart of Segment merging profiles")
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{% endcomment %}
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## Is all matching deterministic, or is there any support for probabilistic matching?
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All Profile matching is deterministic and based on first-party data that you've collected.

‎src/profiles/profile-api-limits.md

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## Identity
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| name | Limit | Details |
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| ----------------- | ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
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| 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. Segment drops additional message merge attempts, which usually indicate corrupt profiles. Once the limit is reached, Segment rejects additional events. |
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| 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. Segment drops additional message mapping attempts, which usually indicate corrupt profiles. This limit counts mappings across all merged profiles. |
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| 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. |
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| name | Limit | Details |
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| ----------------- | ------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| 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. |
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| 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. |
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| 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. |

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