From f729ef08c90b7cd337074b267a7b2768e44a7b6c Mon Sep 17 00:00:00 2001
From: Erik Johnston <erikj@element.io>
Date: Mon, 2 Sep 2024 15:09:04 +0100
Subject: [PATCH] Enable sliding sync support by default (#17648)

Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>
---
 changelog.d/17648.feature      | 1 +
 synapse/config/experimental.py | 6 ++++--
 2 files changed, 5 insertions(+), 2 deletions(-)
 create mode 100644 changelog.d/17648.feature

diff --git a/changelog.d/17648.feature b/changelog.d/17648.feature
new file mode 100644
index 0000000000..49439179da
--- /dev/null
+++ b/changelog.d/17648.feature
@@ -0,0 +1 @@
+Enable native sliding sync support ([MSC3575](https://github.com/matrix-org/matrix-spec-proposals/pull/3575) and [MSC4186](https://github.com/matrix-org/matrix-spec-proposals/pull/4186)) by default.
diff --git a/synapse/config/experimental.py b/synapse/config/experimental.py
index bae9cc8047..5d99c201a7 100644
--- a/synapse/config/experimental.py
+++ b/synapse/config/experimental.py
@@ -338,8 +338,10 @@ class ExperimentalConfig(Config):
         # MSC3391: Removing account data.
         self.msc3391_enabled = experimental.get("msc3391_enabled", False)
 
-        # MSC3575 (Sliding Sync API endpoints)
-        self.msc3575_enabled: bool = experimental.get("msc3575_enabled", False)
+        # MSC3575 (Sliding Sync) alternate endpoints, c.f. MSC4186.
+        #
+        # This is enabled by default as a replacement for the sliding sync proxy.
+        self.msc3575_enabled: bool = experimental.get("msc3575_enabled", True)
 
         # MSC3773: Thread notifications
         self.msc3773_enabled: bool = experimental.get("msc3773_enabled", False)
-- 
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