tag_for_error:
  tag: error
  taggable: first_issue (Issue)
  created_at: 2014-01-01
tag_for_error1:
  tag: error
  taggable: second_issue (Issue)
  created_at: 2015-01-01
tag_for_error2:
  tag: error
  taggable: third_issue (Issue)
  created_at: 2015-01-01
tag_for_feature:
  tag: feature
  taggable: second_issue (Issue)
  created_at: 2015-01-01
tag_for_bug:
  tag: bug
  taggable: second_issue (Issue)
  created_at: 2015-01-01
tag_for_question1:
  tag: question
  taggable: third_issue (Issue)
  created_at: 2015-01-01
tag_for_question2:
  tag: question
  taggable: first_issue (Issue)
  created_at: 2015-01-01
tag_for_question3:
  tag: question
  taggable: second_issue (Issue)
  created_at: 2015-02-01