Add missing GitlabLogger#error method

CHANGELOG

+v7.1.2
+  - Add missing GitlabLogger#error method (!200)
+
 v7.1.1
   - Flush log file after every write (!199)
 

VERSION

-7.1.1
+7.1.2

lib/gitlab_logger.rb

@@ -20,7 +20,8 @@ class GitlabLogger
   LEVELS = {
     Logger::INFO => 'info'.freeze,
     Logger::DEBUG => 'debug'.freeze,
-    Logger::WARN => 'warn'.freeze
+    Logger::WARN => 'warn'.freeze,
+    Logger::ERROR => 'error'.freeze
   }.freeze
 
   def initialize(level, path, log_format)
@@ -47,6 +48,10 @@ class GitlabLogger
     log_at(Logger::WARN, message, data)
   end
 
+  def error(message, data = {})
+    log_at(Logger::ERROR, message, data)
+  end
+
   private
 
   attr_reader :log_file, :log_format

spec/gitlab_logger_spec.rb

@@ -38,6 +38,24 @@ describe GitlabLogger do
     end
   end
 
+  describe '#error' do
+    context 'when the log level is too high' do
+      let(:level) { Logger::FATAL }
+
+      it 'does nothing' do
+        subject.info('hello world')
+
+        expect(output.string).to eq('')
+      end
+    end
+
+    it 'logs data' do
+      subject.error('hello world', foo: 'bar')
+
+      expect(first_line).to eq('time="1973-11-29T21:33:09+00:00" level=error msg="hello world" foo=bar pid=1234')
+    end
+  end
+
   describe '#info' do
     context 'when the log level is too high' do
       let(:level) { Logger::ERROR }