fluent-test-tail.conf

# Have a source directive for each log file source file.
<source>
    # Fluentd input tail plugin, will start reading from the tail of the log
    @type tail
    # Specify the log file path. This supports wild card character
    path /var/lib/docker/containers/*/*json*.log
    # This is recommended ?~@~S Fluentd will record the position it last read into this file. Change this folder according to your server
    pos_file PATH /var/lib/docker/containers/*/docker-containerid.log.pos
    # tag is used to correlate the directives. For example, source with corresponding filter and match directives.
    tag dockerlog
    format /(?<message>.*)/
    #reads the fields from the log file in the specified format
</source>

#<source>
# @type prometheus
#</source>

#<source>
#  @type prometheus_output_monitor
#</source>

#<source>
#  @type prometheus_monitor
#</source>

#<source>
#  @type prometheus_tail_monitor
#</source>

#for printing fluentd collected logs to stdout of host machine when you run fluentd
<match **>
  @type stdout
</match>