don't alert on /run/credentials/systemd fs problems

Author: sjpb

environments/common/files/prometheus/rules/node-exporter.rules

@@ -44,8 +44,12 @@ groups:
       summary: Host out of inodes (instance {{ $labels.instance }})
       description: "Disk is almost running out of available inodes (< 10% left)\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
 
+  # Modified: ignore /run/credentials paths
   - alert: HostFilesystemDeviceError
-    expr: node_filesystem_device_error{fstype!~"^(fuse.*|tmpfs|cifs|nfs)"} == 1
+    expr: node_filesystem_device_error{
+            fstype!~"^(fuse.*|tmpfs|cifs|nfs)",
+            mountpoint!~"/run/credentials/.*"
+          } == 1
     for: 2m
     labels:
       severity: critical