fluentd / google compute logging for Lumen logs

fluentd-lumen.conf

<source>
    type tail
    format multiline
    format_firstline /\[\d{4}-\d{1,2}-\d{1,2} \d{1,2}:\d{1,2}:\d{1,2}\]/
    format1 /^\[(?<time>\d{4}-\d{1,2}-\d{1,2} \d{1,2}:\d{1,2}:\d{1,2})\] lumen.(?<level>[^\s]+)(?<message>.*)/
    path /path/to/my-site/storage/logs/lumen.log
    pos_file /var/lib/google-fluentd/pos/lumen.pos
    read_from_head true
    tag lumen
</source>