Add link to gitlab_issue

Add url for the gitlab issue for issues created
from a sentry issue on the error tracking details page

app/services/error_tracking/issue_details_service.rb

@@ -2,12 +2,35 @@
 
 module ErrorTracking
   class IssueDetailsService < ErrorTracking::BaseService
+    include Gitlab::Routing
+    include Gitlab::Utils::StrongMemoize
+
     private
 
     def perform
       response = project_error_tracking_setting.issue_details(issue_id: params[:issue_id])
 
-      compose_response(response)
+      compose_response(response) do
+        # The gitlab_issue attribute can contain an absolute GitLab url from the Sentry Client
+        # here we overwrite that in favor of our own data if we have it
+        response[:issue].gitlab_issue = gitlab_issue_url if gitlab_issue_url
+      end
+    end
+
+    def gitlab_issue_url
+      strong_memoize(:gitlab_issue_url) do
+        # Use the absolute url to match the GitLab issue url that the Sentry api provides
+        project_issue_url(project, gitlab_issue.iid) if gitlab_issue
+      end
+    end
+
+    def gitlab_issue
+      strong_memoize(:gitlab_issue) do
+        SentryIssueFinder
+          .new(project, current_user: current_user)
+          .execute(params[:issue_id])
+          &.issue
+      end
     end
 
     def parse_response(response)

changelogs/unreleased/42646-include-issues-created-in-gitlab-on-sentry-error-details-page.yml

+---
+title: Include issues created in GitLab on error tracking details page
+merge_request: 23605
+author:
+type: changed

doc/user/project/operations/error_tracking.md

@@ -61,9 +61,9 @@ By default, a **Create issue** button is displayed:
 
 ![Error Details without Issue Link](img/error_details_v12_7.png)
 
-If you create a GitLab issue from the error, the **Create issue** button will change to a **View issue** button:
+If you create a GitLab issue from the error, the **Create issue** button will change to a **View issue** button and a link to the GitLab issue will surface within the error detail section:
 
-![Error Details with Issue Link](img/error_details_with_issue_v12_7.png)
+![Error Details with Issue Link](img/error_details_with_issue_v12_8.png)
 
 ## Taking Action on errors
 

spec/services/error_tracking/issue_details_service_spec.rb

@@ -9,6 +9,7 @@ describe ErrorTracking::IssueDetailsService do
     context 'with authorized user' do
       context 'when issue_details returns a detailed error' do
         let(:detailed_error) { build(:detailed_error_tracking_error) }
+        let(:params) { { issue_id: detailed_error.id } }
 
         before do
           expect(error_tracking_setting)
@@ -18,6 +19,19 @@ describe ErrorTracking::IssueDetailsService do
         it 'returns the detailed error' do
           expect(result).to eq(status: :success, issue: detailed_error)
         end
+
+        it 'returns the gitlab_issue when the error has a sentry_issue' do
+          gitlab_issue = create(:issue, project: project)
+          create(:sentry_issue, issue: gitlab_issue, sentry_issue_identifier: detailed_error.id)
+
+          expect(result[:issue].gitlab_issue).to include(
+            "http", "/#{project.full_path}/issues/#{gitlab_issue.iid}"
+          )
+        end
+
+        it 'returns the gitlab_issue path from sentry when the error has no sentry_issue' do
+          expect(result[:issue].gitlab_issue).to eq(detailed_error.gitlab_issue)
+        end
       end
 
       include_examples 'error tracking service data not ready', :issue_details

spec/support/shared_contexts/sentry_error_tracking_shared_context.rb

@@ -6,9 +6,10 @@ shared_context 'sentry error tracking context' do
 
   let(:sentry_url) { 'https://sentrytest.gitlab.com/api/0/projects/sentry-org/sentry-project' }
   let(:token) { 'test-token' }
+  let(:params) { {} }
   let(:result) { subject.execute }
 
-  subject { described_class.new(project, user) }
+  subject { described_class.new(project, user, params) }
 
   let(:error_tracking_setting) do
     create(:project_error_tracking_setting, api_url: sentry_url, token: token, project: project)