Use AlreadyArchivedError if it's the case

app/workers/ci/archive_traces_cron_worker.rb

@@ -12,9 +12,8 @@ module Ci
       Ci::Build.finished.with_live_trace.find_each(batch_size: 100) do |build|
         begin
           build.trace.archive!
+        rescue ::Gitlab::Ci::Trace::AlreadyArchivedError
         rescue => e
-          next if e.message.include?('Already archived')
-
           failed_archive_counter.increment
           Rails.logger.error "Failed to archive stale live trace. id: #{build.id} message: #{e.message}"
         end

lib/gitlab/ci/trace.rb

@@ -6,7 +6,7 @@ module Gitlab
       LEASE_TIMEOUT = 1.hour
 
       ArchiveError = Class.new(StandardError)
-      WriteError = Class.new(StandardError)
+      AlreadyArchivedError = Class.new(StandardError)
 
       attr_reader :job
 
@@ -83,7 +83,7 @@ module Gitlab
       def write(mode)
         stream = Gitlab::Ci::Trace::Stream.new do
           if trace_artifact
-            raise WriteError, 'Already archived'
+            raise AlreadyArchivedError, 'Could not write to the archived trace'
           elsif current_path
             File.open(current_path, mode)
           elsif Feature.enabled?('ci_enable_live_trace')
@@ -120,7 +120,7 @@ module Gitlab
       private
 
       def unsafe_archive!
-        raise ArchiveError, 'Already archived' if trace_artifact
+        raise AlreadyArchivedError, 'Could not archive again' if trace_artifact
         raise ArchiveError, 'Job is not finished yet' unless job.complete?
 
         if job.trace_chunks.any?

spec/requests/api/runner_spec.rb

@@ -851,6 +851,7 @@ describe API::Runner, :clean_gitlab_redis_shared_state do
         it 'does not update job status and job trace' do
           update_job(state: 'success', trace: 'BUILD TRACE UPDATED')
 
+          job.reload
           expect(response).to have_gitlab_http_status(403)
           expect(response.header['Job-Status']).to eq 'failed'
           expect(job.trace.raw).to eq 'Job failed'

spec/support/shared_examples/ci_trace_shared_examples.rb

@@ -155,7 +155,7 @@ shared_examples_for 'common trace features' do
       end
 
       it 'raises an error' do
-        expect { subject }.to raise_error('Already archived')
+        expect { subject }.to raise_error(Gitlab::Ci::Trace::AlreadyArchivedError)
       end
     end
   end
@@ -596,7 +596,7 @@ shared_examples_for 'trace with disabled live trace feature' do
 
       it 'does not archive' do
         expect_any_instance_of(described_class).not_to receive(:archive_stream!)
-        expect { subject }.to raise_error('Already archived')
+        expect { subject }.to raise_error(Gitlab::Ci::Trace::AlreadyArchivedError)
         expect(build.job_artifacts_trace.file.exists?).to be_truthy
       end
     end
@@ -783,7 +783,7 @@ shared_examples_for 'trace with enabled live trace feature' do
 
       it 'does not archive' do
         expect_any_instance_of(described_class).not_to receive(:archive_stream!)
-        expect { subject }.to raise_error('Already archived')
+        expect { subject }.to raise_error(Gitlab::Ci::Trace::AlreadyArchivedError)
         expect(build.job_artifacts_trace.file.exists?).to be_truthy
       end
     end