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filestat Input Plugin

The filestat plugin gathers metrics about file existence, size, and other stats.

Configuration:

# Read stats about given file(s)
[[inputs.filestat]]
  ## Files to gather stats about.
  ## These accept standard unix glob matching rules, but with the addition of
  ## ** as a "super asterisk". See https://github.com/gobwas/glob.
  files = ["/etc/telegraf/telegraf.conf", "/var/log/**.log"]
  ## If true, read the entire file and calculate an md5 checksum.
  md5 = false

Measurements & Fields:

filestat
- exists (int, 0 | 1)
- size_bytes (int, bytes)
- md5 (optional, string)

Tags:

All measurements have the following tags:
- file (the path the to file, as specified in the config)

Example Output:

$ telegraf -config /etc/telegraf/telegraf.conf -input-filter filestat -test
* Plugin: filestat, Collection 1
> filestat,file=/tmp/foo/bar,host=tyrion exists=0i 1461203374493128216
> filestat,file=/Users/sparrc/ws/telegraf.conf,host=tyrion exists=1i,size=47894i 1461203374493199335