diff --git a/graph/fixes/fix-health-checkpy-disk-check-excludes-squashfstmpfsdevtmpfs-8f344d.md b/graph/fixes/fix-health-checkpy-disk-check-excludes-squashfstmpfsdevtmpfs-8f344d.md
new file mode 100644
index 00000000000..a541510ef4e
--- /dev/null
+++ b/graph/fixes/fix-health-checkpy-disk-check-excludes-squashfstmpfsdevtmpfs-8f344d.md
@@ -0,0 +1,36 @@
+---
+id: 8f344d36-6005-4bfa-aa98-4e68d571a174
+type: fix
+title: "Fix: health_check.py disk check excludes squashfs/tmpfs/devtmpfs to prevent snap mount false positives"
+tags: [monitoring, claude-runner-monitoring, python, fix, homelab, snap]
+importance: 0.7
+confidence: 0.8
+created: "2026-02-20T20:16:35.251352+00:00"
+updated: "2026-02-20T20:16:35.251352+00:00"
+---
+
+## Problem
+
+VM 106 (pihole1) runs Ubuntu with snap packages. Snap mounts are squashfs filesystems that are read-only and always report 100% disk usage. The `df` command in `health_check.py` was including these mounts, causing false critical alerts on any server with snap packages installed.
+
+## Fix
+
+Changed `df` command on line 228 of `health_check.py` from:
+
+```bash
+df -h --output=pcent,target
+```
+
+to:
+
+```bash
+df -h --output=pcent,target -x squashfs -x tmpfs -x devtmpfs
+```
+
+## Impact
+
+Prevents false positive disk space alerts on any monitored server that has snap packages installed. Also excludes tmpfs and devtmpfs which are virtual/RAM filesystems that don't represent real disk usage concerns.
+
+## Project
+
+CT 302 claude-runner-monitoring, file: `health_check.py`