EXPERIMENTAL: Allow logs to be shipped via different methods.

See https://github.com/dwbutler/logstash-logger#uri-configuration for
a list of available methods.

lib/discourse_logstash_logger.rb

@@ -0,0 +1,16 @@
+require 'logstash-logger'
+
+class DiscourseLogstashLogger
+  def self.logger(uri:, type:)
+    LogStashLogger.new(
+      uri: uri,
+      sync: true,
+      customize_event: ->(event) {
+        event['hostname'] = `hostname`.chomp
+        event['severity'] = Object.const_get("Logger::Severity::#{event['severity']}")
+        event['severity_name'] = event['severity']
+        event['type'] = type
+      },
+    )
+  end
+end