GCE/Windows: send container logs to the proper resource

cluster/gce/windows/k8s-node-setup.psm1

@@ -1262,6 +1262,43 @@ $FLUENTD_CONFIG = @'
   remove_keys stream,log
 </match>
 
+# TODO: detect exceptions and forward them as one log entry using the
+# detect_exceptions plugin
+
+# This section is exclusive for k8s_container logs. These logs come with
+# 'raw.stderr' or 'raw.stdout' tags.
+<match {raw.stderr,raw.stdout}>
+  @type google_cloud
+  # Try to detect JSON formatted log entries.
+  detect_json true
+  # Allow log entries from multiple containers to be sent in the same request.
+  split_logs_by_tag false
+  # Set the buffer type to file to improve the reliability and reduce the memory consumption
+  buffer_type file
+  buffer_path /var/log/fluentd-buffers/kubernetes.containers.buffer
+  # Set queue_full action to block because we want to pause gracefully
+  # in case of the off-the-limits load instead of throwing an exception
+  buffer_queue_full_action block
+  # Set the chunk limit conservatively to avoid exceeding the recommended
+  # chunk size of 5MB per write request.
+  buffer_chunk_limit 512k
+  # Cap the combined memory usage of this buffer and the one below to
+  # 512KiB/chunk * (6 + 2) chunks = 4 MiB
+  buffer_queue_limit 6
+  # Never wait more than 5 seconds before flushing logs in the non-error case.
+  flush_interval 5s
+  # Never wait longer than 30 seconds between retries.
+  max_retry_wait 30
+  # Disable the limit on the number of retries (retry forever).
+  disable_retry_limit
+  # Use multiple threads for processing.
+  num_threads 2
+  use_grpc true
+  # Skip timestamp adjustment as this is in a controlled environment with
+  # known timestamp format. This helps with CPU usage.
+  adjust_invalid_timestamps false
+</match>
+
 # Attach local_resource_id for 'k8s_node' monitored resource.
 <filter **>
   @type record_transformer