fix(monitor): record kernel I/O errors on the right disk

AppImage/scripts/notification_events.py

@@ -1402,9 +1402,11 @@ class JournalWatcher:
         if syslog_id != 'kernel' and priority > 3:
             return
         
+        # The kernel writes "dev sdf1, logical block ...": the name stops
+        # at the comma, and a partition is recorded on its disk.
         io_patterns = [
-            r'blk_update_request: I/O error.*dev (\S+)',
-            r'Buffer I/O error on device (\S+)',
+            r'blk_update_request: I/O error.*dev ([^\s,]+)',
+            r'Buffer I/O error on dev(?:ice)? ([^\s,]+)',
             r'SCSI error.*sd(\w)',
             r'(ata\d+)[\.\d]*:.*error',
         ]

AppImage/scripts/tests/test_disk_io_observation_device.py

@@ -0,0 +1,35 @@
+import sys
+import unittest
+from pathlib import Path
+from queue import Queue
+from unittest.mock import patch
+
+SCRIPTS_DIR = Path(__file__).resolve().parents[1]
+if str(SCRIPTS_DIR) not in sys.path:
+    sys.path.insert(0, str(SCRIPTS_DIR))
+
+import notification_events  # noqa: E402
+
+
+class DiskIoObservationDevice(unittest.TestCase):
+    """A kernel I/O error is recorded on its disk, by name alone."""
+
+    def setUp(self):
+        self.watcher = notification_events.JournalWatcher(Queue())
+
+    def recorded(self, message):
+        with patch.object(self.watcher, '_record_disk_io_observation') as record, \
+             patch.object(self.watcher, '_quick_smart_health', return_value='PASSED'):
+            self.watcher._check_disk_io(message, 'kernel', 3)
+        return [call.args[0] for call in record.call_args_list]
+
+    def test_the_comma_after_the_device_is_not_part_of_its_name(self):
+        self.assertEqual(self.recorded('Buffer I/O error on dev sdf1, logical block 0, async page read'), ['sdf'])
+        self.assertEqual(self.recorded('blk_update_request: I/O error, dev sdc, sector 2048 op 0x0:(READ)'), ['sdc'])
+
+    def test_the_older_wording_is_still_read(self):
+        self.assertEqual(self.recorded('Buffer I/O error on device sdb2, logical block 8'), ['sdb'])
+
+
+if __name__ == '__main__':
+    unittest.main()