remove aufs hung check

config/kernel-monitor-filelog.json

@@ -42,12 +42,6 @@
 			"reason": "KernelOops",
 			"pattern": "divide error: 0000 \\[#\\d+\\] SMP"
 		},
-		{
-			"type": "permanent",
-			"condition": "KernelDeadlock",
-			"reason": "AUFSUmountHung",
-			"pattern": "task umount\\.aufs:\\w+ blocked for more than \\w+ seconds\\."
-		},
 		{
 			"type": "permanent",
 			"condition": "KernelDeadlock",

config/kernel-monitor.json

@@ -63,12 +63,6 @@
 			"reason": "MemoryReadError",
 			"pattern": "CE memory read error .*"
 		},
-		{
-			"type": "permanent",
-			"condition": "KernelDeadlock",
-			"reason": "AUFSUmountHung",
-			"pattern": "task umount\\.aufs:\\w+ blocked for more than \\w+ seconds\\."
-		},
 		{
 			"type": "permanent",
 			"condition": "KernelDeadlock",

deployment/node-problem-detector-config.yaml

@@ -50,12 +50,6 @@ data:
     			"reason": "MemoryReadError",
     			"pattern": "CE memory read error .*"
             },
-            {
-                "type": "permanent",
-                "condition": "KernelDeadlock",
-                "reason": "AUFSUmountHung",
-                "pattern": "task umount\\.aufs:\\w+ blocked for more than \\w+ seconds\\."
-            },
             {
                 "type": "permanent",
                 "condition": "KernelDeadlock",

pkg/util/metrics/testdata/sample_metrics.txt

@@ -18,7 +18,6 @@ disk_weighted_io{device="sda8"} 160
 host_uptime{kernel_version="4.14.127+",os_version="cos 73-11647.217.0"} 81
 # HELP problem_counter Number of times a specific type of problem have occurred.
 # TYPE problem_counter counter
-problem_counter{reason="AUFSUmountHung"} 0
 problem_counter{reason="ContainerdStart"} 1
 problem_counter{reason="CorruptDockerImage"} 0
 problem_counter{reason="CorruptDockerOverlay2"} 0
@@ -35,7 +34,6 @@ problem_counter{reason="TaskHung"} 0
 problem_counter{reason="UnregisterNetDevice"} 0
 # HELP problem_gauge Whether a specific type of problem is affecting the node or not.
 # TYPE problem_gauge gauge
-problem_gauge{reason="AUFSUmountHung",type="KernelDeadlock"} 0
 problem_gauge{reason="CorruptDockerOverlay2",type="CorruptDockerOverlay2"} 0
 problem_gauge{reason="DockerHung",type="KernelDeadlock"} 0
 problem_gauge{reason="FilesystemIsReadOnly",type="ReadonlyFilesystem"} 0