Creates SystemStatusController and SystemMetricsService for status in…

…fo UI + Defines functions to get stats and queue info from Sidekiq

app/controllers/system_status_controller.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+class SystemStatusController < ApplicationController
+  # service = SystemMetricsService.new
+end

app/services/get_system_metrics.rb

@@ -0,0 +1,52 @@
+# frozen_string_literal: true
+
+require 'sidekiq/api'
+
+class SystemMetricsService
+  def initialize
+    @queues = YAML.load_file('config/sidekiq.yml')[:queues]
+    fetch_sidekiq_stats
+  end
+
+  def fetch_sidekiq_stats
+    stats = Sidekiq::Stats.new
+
+    @processed_jobs_stat = stats.processed
+    @failed_jobs_stat = stats.failed # Failed Job Retention
+    @enqueued_jobs_stat = stats.enqueued
+    @scheduled_jobs_stat = stats.scheduled_size
+
+    # also allow stats from selected dates to be viewed
+    # using Stats::History
+  end
+
+  # def fetch_system_health_metrics
+  # end
+
+  # def fetch_reliability_metrics
+  # end
+
+  # def fetch_availability_metrics
+  # end
+
+  # def fetch_processing_efficiency_metrics
+  # end
+
+  # def fetch_resource_utilization_metrics
+  # end
+
+  def fetch_queue_management_metrics
+    # Queue latency; how long jobs wait in the queue before processing
+    @queues.map do |queue_name|
+      queue = Sidekiq::Queue.new(queue_name)
+      {
+        name: queue.name,
+        size: queue.size,
+        latency: queue.latency
+      }
+    end
+  end
+
+  # def fetch_data_freshness_metrics
+  # end
+end