init plus overview

Author: pwseg

src/unify/unify-event-filtering.md

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+---
+title: Unify Event Filtering
+plan: unify
+---
+
+Unify Event Filtering lets you control which events reach your Unify space. 
+
+## Overview
+
+With Unify Event Filtering, you can use block events that aren’t useful for identity resolution or downstream activation, keeping your space cleaner and more efficient.
+
+Event Filtering is useful when you’re sending a lot of different event types into Segment but only some of them are relevant to Unify. For example, you might want to:
+
+- Drop telemetry or system events that don’t describe user behavior
+- Filter out events from certain regions or user groups
+- Keep events in Connections, but exclude them from Unify
+