[fluentd-gcp addon] Restore the metric for the number of read log entries

cluster/addons/fluentd-gcp/fluentd-gcp-configmap.yaml

@@ -332,6 +332,19 @@ data:
       </metric>
     </match>
 
+    # This filter allows to count the number of log entries read by fluentd
+    # before they are processed by the output plugin. This in turn allows to
+    # monitor the number of log entries that were read but never sent, e.g.
+    # because of liveness probe removing buffer.
+    <filter **>
+      @type prometheus
+      <metric>
+        type counter
+        name logging_entry_count
+        desc Total number of log entries generated by either application containers or system components
+      </metric>
+    </filter>
+
     # We use 2 output stanzas - one to handle the container logs and one to handle
     # the node daemon logs, the latter of which explicitly sends its logs to the
     # compute.googleapis.com service rather than container.googleapis.com to keep
@@ -383,7 +396,7 @@ data:
       num_threads 2
     </match>
 metadata:
-  name: fluentd-gcp-config-v1.1
+  name: fluentd-gcp-config-v1.1.2
   namespace: kube-system
   labels:
     addonmanager.kubernetes.io/mode: Reconcile

cluster/addons/fluentd-gcp/fluentd-gcp-ds.yaml

@@ -117,7 +117,7 @@ spec:
           path: /usr/lib64
       - name: config-volume
         configMap:
-          name: fluentd-gcp-config-v1.1
+          name: fluentd-gcp-config-v1.1.2
       - name: ssl-certs
         hostPath:
           path: /etc/ssl/certs