From feb6f035c8c420fd141f773edee621dabb6bc413 Mon Sep 17 00:00:00 2001
From: tiennm99 <tiennm99@outlook.com>
Date: Tue, 6 Oct 2026 16:50:22 +0700
Subject: [PATCH] fix(alloy): mount /run/udev for diskstats device properties

node-exporter's diskstats collector reads udev device properties from
/run/udev/data; without the mount it logs an error and drops those labels.
---
 alloy/README.md   | 1 +
 alloy/compose.yml | 1 +
 2 files changed, 2 insertions(+)

diff --git a/alloy/README.md b/alloy/README.md
index 51e45a7..52008fa 100644
--- a/alloy/README.md
+++ b/alloy/README.md
@@ -131,6 +131,7 @@ the disclosure one.
 | `/sys:/sys:ro` | node-exporter and cadvisor cgroups |
 | `/:/rootfs:ro` | filesystem collector, via `rootfs_path` |
 | `/dev/disk/:/dev/disk:ro` | node-exporter diskstats device labels |
+| `/run/udev:/run/udev:ro` | node-exporter diskstats udev device properties (`/run/udev/data`) |
 | `/var/lib/docker:ro` | cadvisor container metadata |
 | `/var/log:/var/log:ro` | `loki.source.journal` and `loki.source.file` |
 | `/etc/machine-id:ro` | Stable host id for the journal reader |
diff --git a/alloy/compose.yml b/alloy/compose.yml
index 84345c8..435040d 100644
--- a/alloy/compose.yml
+++ b/alloy/compose.yml
@@ -29,6 +29,7 @@ services:
       - /sys:/sys:ro
       - /:/rootfs:ro
       - /dev/disk/:/dev/disk:ro
+      - /run/udev:/run/udev:ro
       - /var/lib/docker/:/var/lib/docker:ro
       - /var/log:/var/log:ro
       - /etc/machine-id:/etc/machine-id:ro