Allow projects to be displayed when Gitaly fails to load pipeline status

changelogs/unreleased/34722-dashboard-projectscontroller-should-tolerate-single-gitaly-node-fai.yml

+---
+title: Fix pipeline status loading errors on project dashboard page caused by Gitaly
+  connection failures
+merge_request: 23378
+author:
+type: fixed

lib/gitlab/cache/ci/project_pipeline_status.rb

@@ -59,6 +59,10 @@ module Gitlab
           end
 
           self.loaded = true
+        rescue GRPC::Unavailable, GRPC::DeadlineExceeded => e
+          # Handle Gitaly connection issues gracefully
+          Gitlab::ErrorTracking
+            .track_exception(e, project_id: project.id)
         end
 
         def load_from_project

spec/lib/gitlab/cache/ci/project_pipeline_status_spec.rb

@@ -114,6 +114,24 @@ describe Gitlab::Cache::Ci::ProjectPipelineStatus, :clean_gitlab_redis_cache do
       pipeline_status.load_status
       pipeline_status.load_status
     end
+
+    it 'handles Gitaly unavailable exceptions gracefully' do
+      allow(pipeline_status).to receive(:commit).and_raise(GRPC::Unavailable)
+
+      expect(Gitlab::ErrorTracking).to receive(:track_exception).with(
+        an_instance_of(GRPC::Unavailable), project_id: project.id
+      )
+      expect { pipeline_status.load_status }.not_to raise_error
+    end
+
+    it 'handles Gitaly timeout exceptions gracefully' do
+      allow(pipeline_status).to receive(:commit).and_raise(GRPC::DeadlineExceeded)
+
+      expect(Gitlab::ErrorTracking).to receive(:track_exception).with(
+        an_instance_of(GRPC::DeadlineExceeded), project_id: project.id
+      )
+      expect { pipeline_status.load_status }.not_to raise_error
+    end
   end
 
   describe "#load_from_project", :clean_gitlab_redis_cache do