feat: add chatwoot instance status in superadmin (#6045)

* feat: add chatwoot instance status in superadmin

* feat: add redis metrics to instance health page

* chore: fix rubocop

* chore: rescue redis no connection

* chore: add rspec

* chore: refactor

* feat: add instance health to /api

* chore: rescue postgres

* chore: fix spec

app/controllers/api_controller.rb

@@ -2,6 +2,24 @@ class ApiController < ApplicationController
   skip_before_action :set_current_user, only: [:index]
 
   def index
-    render json: { version: Chatwoot.config[:version], timestamp: Time.now.utc.to_formatted_s(:db) }
+    render json: { version: Chatwoot.config[:version],
+                   timestamp: Time.now.utc.to_formatted_s(:db),
+                   queue_services: redis_status,
+                   data_services: postgres_status }
+  end
+
+  private
+
+  def redis_status
+    r = Redis.new(Redis::Config.app)
+    return 'ok' if r.ping
+  rescue Redis::CannotConnectError
+    'failing'
+  end
+
+  def postgres_status
+    ActiveRecord::Base.connection.active? ? 'ok' : 'failing'
+  rescue ActiveRecord::ConnectionNotEstablished
+    'failing'
   end
 end