RuntimeMetric unused struct removed

Author: benngarcia

lib/prometheus_exporter/instrumentation/delayed_job.rb

@@ -4,8 +4,6 @@ module PrometheusExporter::Instrumentation
   class DelayedJob
     JOB_CLASS_REGEXP = %r{job_class: (\w+:{0,2})+}.freeze
 
-    RuntimeMetric = Struct.new(:max_attempts, :enqueued_count, :pending_count, :ready_count)
-
     class << self
       def register_plugin(client: nil)
         instrumenter = self.new(client: client)