Move the logging-related directories to where I think they belong.

1. Move fluentd-gcp to be a core cluster addon, rather than a contrib.
2. Get rid of the synthetic logger under contrib, since the exact same
synthetic logger was also included in the logging-demo.
3. Move the logging-demo to examples, since it's effectively an example.

We should also consider adding on a GCP section to the logging-demo
example :)

cluster/addons/fluentd-gcp/fluentd-gcp-image/Dockerfile

@@ -0,0 +1,25 @@
+# This Dockerfile will build an image that is configured
+# to use Fluentd to collect all Docker container log files
+# and then cause them to be ingested using the Google Cloud
+# Logging API. This configuration assumes that the host performning
+# the collection is a VM that has been created with a logging.write
+# scope and that the Logging API has been enabled for the project
+# in the Google Developer Console. 
+
+FROM ubuntu:14.04
+MAINTAINER Satnam Singh "satnam@google.com"
+
+# Disable prompts from apt.
+ENV DEBIAN_FRONTEND noninteractive
+ENV OPTS_APT -y --force-yes --no-install-recommends
+
+RUN apt-get -q update && \
+    apt-get -y install curl && \
+    apt-get clean && \
+    curl -s https://storage.googleapis.com/signals-agents/logging/google-fluentd-install.sh | sudo bash
+
+# Copy the Fluentd configuration file for logging Docker container logs.
+COPY google-fluentd.conf /etc/google-fluentd/google-fluentd.conf
+
+# Start Fluentd to pick up our config that watches Docker container logs.
+CMD /usr/sbin/google-fluentd -qq > /var/log/google-fluentd.log

cluster/addons/fluentd-gcp/fluentd-gcp-image/Makefile

@@ -0,0 +1,16 @@
+# The build rule builds a Docker image that logs all Docker contains logs to
+# Google Compute Platform using the Cloud Logging API. The push rule pushes
+# the image to DockerHub.
+# Satnam Singh (satnam@google.com)
+
+.PHONY:	build push
+
+
+TAG = 1.2
+
+build:
+	docker build -t gcr.io/google_containers/fluentd-gcp:$(TAG) .
+
+push:
+	gcloud preview docker push gcr.io/google_containers/fluentd-gcp:$(TAG)
+

cluster/addons/fluentd-gcp/fluentd-gcp-image/README.md

@@ -0,0 +1,8 @@
+# Collecting Docker Log Files with Fluentd and sending to GCP.
+This directory contains the source files needed to make a Docker image
+that collects Docker container log files using [Fluentd](http://www.fluentd.org/)
+and sends them to GCP.
+This image is designed to be used as part of the [Kubernetes](https://github.com/GoogleCloudPlatform/kubernetes)
+cluster bring up process. The image resides at DockerHub under the name
+[kubernetes/fluentd-gcp](https://registry.hub.docker.com/u/kubernetes/fluentd-gcp/).
+

cluster/addons/fluentd-gcp/fluentd-gcp-image/google-fluentd.conf

@@ -0,0 +1,51 @@
+# This Fluentd configuration file specifies the colleciton
+# of all Docker container log files under /var/lib/docker/containers/...
+# followed by ingestion using the Google Cloud Logging API.
+# This configuration assumes the correct installation of the the
+# Google fluentd plug-in. Currently the collector uses a text format
+# rather than JSON (which is the format used to store the Docker
+# log files). When the fluentd plug-in can accept JSON this
+# configuraiton file should be changed by specifying:
+#    format json
+# in the source section.
+# This configuration file assumes that the VM host running
+# this configuraiton has been created with a logging.write scope.
+# Maintainer: Satnam Singh (satnam@google.com)
+
+<source>
+  type tail
+  format none
+  time_key time
+  path /var/lib/docker/containers/*/*-json.log
+  pos_file /var/lib/docker/containers/gcp-containers.log.pos
+  time_format %Y-%m-%dT%H:%M:%S
+  tag docker.*
+  read_from_head true
+</source>
+
+<match docker.**>
+  type google_cloud
+  flush_interval 5s
+  # Never wait longer than 5 minutes between retries.
+  max_retry_wait 300
+  # Disable the limit on the number of retries (retry forever).
+  disable_retry_limit
+</match>
+
+<source>
+  type tail
+  format none
+  time_key time
+  path /varlog/kubelet.log
+  pos_file /varlog/gcp-kubelet.log.pos
+  tag kubelet
+</source>
+
+<match kubelet>
+  type google_cloud
+  flush_interval 5s
+  # Never wait longer than 5 minutes between retries.
+  max_retry_wait 300
+  # Disable the limit on the number of retries (retry forever).
+  disable_retry_limit
+</match>