Settings replaced by Gitlab.config

app/helpers/issues_helper.rb

@@ -48,7 +48,7 @@ module IssuesHelper
     if @project.used_default_issues_tracker?
       project_issues_filter_path(@project)
     else
-      url = Settings[:issues_tracker][@project.issues_tracker]["project_url"]
+      url = Gitlab.config.issues_tracker[@project.issues_tracker]["project_url"]
       url.gsub(':project_id', @project.id.to_s)
          .gsub(':issues_tracker_id', @project.issues_tracker_id.to_s)
     end
@@ -60,7 +60,7 @@ module IssuesHelper
     if @project.used_default_issues_tracker?
       url = new_project_issue_path project_id: @project
     else
-      url = Settings[:issues_tracker][@project.issues_tracker]["new_issue_url"]
+      url = Gitlab.config.issues_tracker[@project.issues_tracker]["new_issue_url"]
       url.gsub(':project_id', @project.id.to_s)
         .gsub(':issues_tracker_id', @project.issues_tracker_id.to_s)
     end
@@ -72,7 +72,7 @@ module IssuesHelper
     if @project.used_default_issues_tracker?
       url = project_issue_url project_id: @project, id: issue_id
     else
-      url = Settings[:issues_tracker][@project.issues_tracker]["issues_url"]
+      url = Gitlab.config.issues_tracker[@project.issues_tracker]["issues_url"]
       url.gsub(':id', issue_id.to_s)
         .gsub(':project_id', @project.id.to_s)
         .gsub(':issues_tracker_id', @project.issues_tracker_id.to_s)