Merge pull request #5223 from segmentio/tanjinhong72-patch-2

Add faq that retries could account for events not filtered by Destination Filter

Author: pwseg

src/connections/destinations/destination-filters.md

@@ -229,3 +229,9 @@ Destination Filters can't target properties or traits with spaces in the field n
 #### Can I use destination filters to drop events unsupported by a destination?
 
 The check for unsupported events types happens before any destination filter checks. As a result, Destination Filters can't prevent unsupported event type errors. To filter these events, use the [Integrations Object](/docs/guides/filtering-data/#filtering-with-the-integrations-object).
+
+#### Why do I see events sent through after I just added a destination filter?
+
+Destination filters only filter events sent after filter setup. If you just added a destination filter but still see some events going through, you're likely seeing retries from failed events that occurred before you set up the filter.
+
+When Segment sends an event to a destination but encounters a timeout error, it attempts to send the event again. As a result, if you add a destination filter while Segment is trying to send a failed event, these retries could filter through, since they reflect events that occurred before filter setup.