Convert githost.log to JSON format

This will make it easier to parse this in production and adds the
`correlation_id` if available.

3 files changed, 16 insertions, 9 deletions

diff --git a/changelogs/unreleased/sh-make-githost-json.yml b/changelogs/unreleased/sh-make-githost-json.yml
new file mode 100644
index 00000000000..f4113a693cc
--- /dev/null
+++ b/changelogs/unreleased/sh-make-githost-json.yml
@@ -0,0 +1,5 @@
+---
+title: Convert githost.log to JSON format
+merge_request: 30967
+author:
+type: changed
diff --git a/doc/administration/logs.md b/doc/administration/logs.md
index 5a2f389d298..563701b8677 100644
--- a/doc/administration/logs.md
+++ b/doc/administration/logs.md
@@ -157,16 +157,22 @@ This file lives in `/var/log/gitlab/gitlab-rails/githost.log` for
 Omnibus GitLab packages or in `/home/git/gitlab/log/githost.log` for
 installations from source.
 
+NOTE: **Note:**
+After 12.2, this file will be stored in JSON format.
+
 GitLab has to interact with Git repositories but in some rare cases
 something can go wrong and in this case you will know what exactly
 happened. This log file contains all failed requests from GitLab to Git
 repositories. In the majority of cases this file will be useful for developers
 only. For example:
 
-```
-December 03, 2014 13:20 -> ERROR -> Command failed [1]: /usr/bin/git --git-dir=/Users/vsizov/gitlab-development-kit/gitlab/tmp/tests/gitlab-satellites/group184/gitlabhq/.git --work-tree=/Users/vsizov/gitlab-development-kit/gitlab/tmp/tests/gitlab-satellites/group184/gitlabhq merge --no-ff -mMerge branch 'feature_conflict' into 'feature' source/feature_conflict
-
-error: failed to push some refs to '/Users/vsizov/gitlab-development-kit/repositories/gitlabhq/gitlab_git.git'
+```json
+{
+   "severity":"ERROR",
+   "time":"2019-07-19T22:16:12.528Z",
+   "correlation_id":"FeGxww5Hj64",
+   "message":"Command failed [1]: /usr/bin/git --git-dir=/Users/vsizov/gitlab-development-kit/gitlab/tmp/tests/gitlab-satellites/group184/gitlabhq/.git --work-tree=/Users/vsizov/gitlab-development-kit/gitlab/tmp/tests/gitlab-satellites/group184/gitlabhq merge --no-ff -mMerge branch 'feature_conflict' into 'feature' source/feature_conflict\n\nerror: failed to push some refs to '/Users/vsizov/gitlab-development-kit/repositories/gitlabhq/gitlab_git.git'"
+}
 ```
 
 ## `audit_json.log`
diff --git a/lib/gitlab/git_logger.rb b/lib/gitlab/git_logger.rb
index dac4ddd320f..ded5349be01 100644
--- a/lib/gitlab/git_logger.rb
+++ b/lib/gitlab/git_logger.rb
@@ -1,13 +1,9 @@
 # frozen_string_literal: true
 
 module Gitlab
-  class GitLogger < Gitlab::Logger
+  class GitLogger < JsonLogger
     def self.file_name_noext
       'githost'
     end
-
-    def format_message(severity, timestamp, progname, msg)
-      "#{timestamp.to_s(:long)} -> #{severity} -> #{msg}\n"
-    end
   end
 end