From d16bd4742a74d3d3b4dafc59c774df8760df342d Mon Sep 17 00:00:00 2001
From: Martin Weinelt <hexa@darmstadt.ccc.de>
Date: Wed, 23 Sep 2026 21:00:10 +0200
Subject: [PATCH] nixos/matrix-synapse: fix process metrics

ProcSubset=pid is too strict and breaks the ProcessCollector within
prometheus-python-client. The metrics are used in the Synapse dashboard.

(cherry picked from commit 9e3a8ef12da7342623d28f1d0a3ad0baed198e93)
---
 nixos/modules/services/matrix/synapse.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nixos/modules/services/matrix/synapse.nix b/nixos/modules/services/matrix/synapse.nix
index e3477ba9ba35..cb0263a18c50 100644
--- a/nixos/modules/services/matrix/synapse.nix
+++ b/nixos/modules/services/matrix/synapse.nix
@@ -1494,7 +1494,7 @@ in
             PrivateDevices = true;
             PrivateTmp = true;
             PrivateUsers = true;
-            ProcSubset = "pid";
+            ProcSubset = "all"; # pid breaks most process metrics
             ProtectClock = true;
             ProtectControlGroups = true;
             ProtectHome = true;