Move ReadonlyFilesystem to separate config file

Moved the ReadonlyFilesystem Node Condition to a separate plugin
configuration file and updated NPD to contain the appropiate new flags.

deployment/node-problem-detector-config.yaml

@@ -64,6 +64,30 @@ data:
             }
         ]
     }
+  readonly-monitor.json: |
+    {
+        "plugin": "kmsg",
+        "logPath": "/dev/kmsg",
+        "lookback": "5m",
+        "bufferSize": 10,
+        "source": "readonly-monitor",
+        "metricsReporting": true,
+        "conditions": [
+            {
+                "type": "ReadonlyFilesystem",
+                "reason": "FilesystemIsNotReadOnly",
+                "message": "Filesystem is not read-only"
+            }
+        ],
+        "rules": [
+            {
+                "type": "permanent",
+                "condition": "ReadonlyFilesystem",
+                "reason": "FilesystemIsReadOnly",
+                "pattern": "Remounting filesystem read-only"
+            }
+        ]
+    }
   docker-monitor.json: |
     {
         "plugin": "journald",

deployment/node-problem-detector-healthchecker.yaml

@@ -28,7 +28,7 @@ spec:
         command:
         - /node-problem-detector
         - --logtostderr
-        - --config.system-log-monitor=/config/kernel-monitor.json,/config/docker-monitor.json
+        - --config.system-log-monitor=/config/kernel-monitor.json,/config/readonly-monitor.json,/config/docker-monitor.json
         - --config.custom-plugin-monitor=/config/health-checker-kubelet.json
         image: registry.k8s.io/node-problem-detector/node-problem-detector:v0.8.19
         resources:
@@ -86,6 +86,8 @@ spec:
           items:
           - key: kernel-monitor.json
             path: kernel-monitor.json
+          - key: readonly-monitor.json
+            path: readonly-monitor.json
           - key: docker-monitor.json
             path: docker-monitor.json
       - name: machine-id

deployment/node-problem-detector.yaml

@@ -28,7 +28,7 @@ spec:
         command:
         - /node-problem-detector
         - --logtostderr
-        - --config.system-log-monitor=/config/kernel-monitor.json,/config/docker-monitor.json
+        - --config.system-log-monitor=/config/kernel-monitor.json,/config/readonly-monitor.json,/config/docker-monitor.json
         image: registry.k8s.io/node-problem-detector/node-problem-detector:v0.8.19
         resources:
           limits:
@@ -78,6 +78,8 @@ spec:
           items:
           - key: kernel-monitor.json
             path: kernel-monitor.json
+          - key: readonly-monitor.json
+            path: readonly-monitor.json
           - key: docker-monitor.json
             path: docker-monitor.json
       tolerations: