Remove all references to Gitlab::CorrelationId

This class has been replaced with Labkit::Correlation::CorrelationId

lib/gitlab/correlation_id.rb

-# frozen_string_literal: true
-
-module Gitlab
-  module CorrelationId
-    LOG_KEY = 'correlation_id'.freeze
-
-    class << self
-      def use_id(correlation_id, &blk)
-        # always generate a id if null is passed
-        correlation_id ||= new_id
-
-        ids.push(correlation_id || new_id)
-
-        begin
-          yield(current_id)
-        ensure
-          ids.pop
-        end
-      end
-
-      def current_id
-        ids.last
-      end
-
-      def current_or_new_id
-        current_id || new_id
-      end
-
-      private
-
-      def ids
-        Thread.current[:correlation_id] ||= []
-      end
-
-      def new_id
-        SecureRandom.uuid
-      end
-    end
-  end
-end

lib/gitlab/tracing.rb

@@ -30,7 +30,7 @@ def self.tracing_url
       # Avoid using `format` since it can throw TypeErrors
       # which we want to avoid on unsanitised env var input
       tracing_url_template.to_s
-        .gsub(/\{\{\s*correlation_id\s*\}\}/, Gitlab::CorrelationId.current_id.to_s)
+        .gsub(/\{\{\s*correlation_id\s*\}\}/, Labkit::Correlation::CorrelationId.current_id.to_s)
         .gsub(/\{\{\s*service\s*\}\}/, Gitlab.process_name)
     end
   end

spec/lib/gitlab/tracing_spec.rb

@@ -59,7 +59,7 @@
       it 'returns the correct state for .tracing_url' do
         expect(described_class).to receive(:tracing_url_enabled?).and_return(tracing_url_enabled?)
         allow(described_class).to receive(:tracing_url_template).and_return(tracing_url_template)
-        allow(Gitlab::CorrelationId).to receive(:current_id).and_return(correlation_id)
+        allow(Labkit::Correlation::CorrelationId).to receive(:current_id).and_return(correlation_id)
         allow(Gitlab).to receive(:process_name).and_return(process_name)
 
         expect(described_class.tracing_url).to eq(tracing_url)