Add (optional) UUID to log name

[josephlewis42]

This proposal is to add the ability for the user to request a UUID in the log name and optionally turn off the hostname e.g. logstash_2018-01-01T01:01:00.part1.{{UUID}}.log. This has the following benefits:

1. A new log won't clobber the old one after Logstash is restarted on a host with the same name. See @neuromantik33 description in #20 for more info.
2. Users could turn off using the hostname in their file names if:
   • They don't want an information leak: @joshdvir opened #9 for this
   • They needed to be able to use a single glob to match their logs to import into BigQuery @arslanm had to modify the plugin in #19 to do this

Thoughts @neuromantik33, @joshdvir and @arslanm?

[arslanm]

LGTM

[joshdvir]

LGTM

[josephlewis42]

I have this functionality built out now, it would be awesome if one of ya'll would give it a go and give thumbs up/down. I have a pre-release gem published here, the version is 3.1.0.

There are two new configuration options. Both are boolean:

• include_uuid - default false, appends a UUID before the file extension .log[.gz]
• include_hostname - default true, whether or not to include the hostname in the prefix.