Add structured logging to MergeRequestMergeabilityCheckWorker

Changelog: added

app/workers/merge_request_mergeability_check_worker.rb

@@ -14,7 +14,7 @@ class MergeRequestMergeabilityCheckWorker
     merge_request = MergeRequest.find_by_id(merge_request_id)
 
     unless merge_request
-      logger.error("Failed to find merge request with ID: #{merge_request_id}")
+      Sidekiq.logger.error(worker: self.class.name, message: "Failed to find merge request", merge_request_id: merge_request_id)
       return
     end
 
@@ -23,6 +23,6 @@ class MergeRequestMergeabilityCheckWorker
         .new(merge_request)
         .execute(recheck: false, retry_lease: false)
 
-    logger.error("Failed to check mergeability of merge request (#{merge_request_id}): #{result.message}") if result.error?
+    Sidekiq.logger.error(worker: self.class.name, message: "Failed to check mergeability of merge request: #{result.message}", merge_request_id: merge_request_id) if result.error?
   end
 end

spec/workers/merge_request_mergeability_check_worker_spec.rb

@@ -10,6 +10,12 @@ RSpec.describe MergeRequestMergeabilityCheckWorker do
       it 'does not execute MergeabilityCheckService' do
         expect(MergeRequests::MergeabilityCheckService).not_to receive(:new)
 
+        expect(Sidekiq.logger).to receive(:error).once
+          .with(
+            merge_request_id: 1,
+            worker: "MergeRequestMergeabilityCheckWorker",
+            message: 'Failed to find merge request')
+
         subject.perform(1)
       end
     end
@@ -24,6 +30,20 @@ RSpec.describe MergeRequestMergeabilityCheckWorker do
 
         subject.perform(merge_request.id)
       end
+
+      it 'structurally logs a failed mergeability check' do
+        expect_next_instance_of(MergeRequests::MergeabilityCheckService, merge_request) do |service|
+          expect(service).to receive(:execute).and_return(double(error?: true, message: "solar flares"))
+        end
+
+        expect(Sidekiq.logger).to receive(:error).once
+          .with(
+            merge_request_id: merge_request.id,
+            worker: "MergeRequestMergeabilityCheckWorker",
+            message: 'Failed to check mergeability of merge request: solar flares')
+
+        subject.perform(merge_request.id)
+      end
     end
 
     it_behaves_like 'an idempotent worker' do