telegraf/plugins/inputs/file/README.md

File Input Plugin

The file plugin updates a list of files every interval and parses the contents using the selected input data format.

Files will always be read in their entirety, if you wish to tail/follow a file use the tail input plugin instead.

Configuration:

[[inputs.file]]
  ## Files to parse each interval.
  ## These accept standard unix glob matching rules, but with the addition of
  ## ** as a "super asterisk". ie:
  ##   /var/log/**.log     -> recursively find all .log files in /var/log
  ##   /var/log/*/*.log    -> find all .log files with a parent dir in /var/log
  ##   /var/log/apache.log -> only read the apache log file
  files = ["/var/log/apache/access.log"]

  ## Data format to consume.
  ## Each data format has its own unique set of configuration options, read
  ## more about them here:
  ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
  data_format = "influx"

  ## Name a tag containing the name of the file the data was parsed from.  Leave empty
  ## to disable.
  # file_tag = ""