journald to Stackdriver fluentd config

google-fluentd.conf

# Copyright 2017 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Pipe in journal entries and send them to Stackdriver.
# Requires fluent-plugin-stdin.
# Use: `journalctl --output=json --follow --no-tail --boot`

<source>
  @type stdin
  tag journald
  format json
</source>

<filter journald>
  @type record_transformer
  enable_ruby
  <record>
    timestampSeconds ${record["__REALTIME_TIMESTAMP"].to_i/1000000}
    timestampNanos ${record["__REALTIME_TIMESTAMP"].to_i % 1000000 * 1000}
    severity ${{"0" => "EMERGENCY", "1" => "ALERT", "2" => "CRITICAL", "3" => "ERROR", "4" => "WARNING", "5" => "NOTICE", "6" => "INFO", "7" => "DEBUG"}[record["PRIORITY"]]}
    message ${record["MESSAGE"]}
  </record>
</filter>

<filter journald>
  @type record_transformer
  renew_time_key timestampSeconds
  remove_keys MESSAGE
</filter>

<match **>
  @type google_cloud
</match>