- opened_by: "created by <a href='%{user_url}'>%{user}</a> at %{time}"
- opened_by_anonymous: "created by anonymous at %{time}"
- commented_by: "comment from <a href='%{user_url}'>%{user}</a> at %{time}"
- commented_by_anonymous: "comment from anonymous at %{time}"
- closed_by: "resolved by <a href='%{user_url}'>%{user}</a> at %{time}"
- closed_by_anonymous: "resolved by anonymous at %{time}"
- reopened_by: "reactivated by <a href='%{user_url}'>%{user}</a> at %{time}"
- reopened_by_anonymous: "reactivated by anonymous at %{time}"