Implement json logging for application.log
The application.log is causing us difficulty (https://gitlab.com/gitlab-com/infrastructure/issues/4244#note_81693147). It would be helpful if it were structured as JSON and used the same timestamp format as other logs. For reference here are some other other log timestamp formats:
- Gitaly 2018-05-23T13:41:10Z
- Pages 2018-05-23T11:14:50Z
- production_json 2018-05-23T15:24:23.915Z
- geo 2018-05-23T16:04:23.624Z
- sidekiq: 2018-05-23T14:40:00.808Z
- api_json: 2018-05-23T15:47:07.471Z
- gitlab-shell: 2018-05-23T15:45:56+00:00
- application.log May 23, 2018 09:56
Proposal
Introduce a structured version of application.log:
- Retain
application.log. - Introduce a new structured logfile,
application_json.log. - In the structured logfile, use a timestamp format that is consistent with other log files, e.g.
2018-05-23T15:24:23.915Z. This is being worked on in another issue.
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