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

app/controllers/super_admin/instance_statuses_controller.rb

@@ -0,0 +1,44 @@
+class SuperAdmin::InstanceStatusesController < SuperAdmin::ApplicationController
+  def show
+    @metrics = {}
+    chatwoot_version
+    sha
+    postgres_status
+    redis_metrics
+  end
+
+  def chatwoot_version
+    @metrics['Chatwoot version'] = Chatwoot.config[:version]
+  end
+
+  def sha
+    sha = `git rev-parse HEAD`
+    @metrics['Git SHA'] = sha.presence || 'n/a'
+  end
+
+  def postgres_status
+    @metrics['Postgres alive'] = if ActiveRecord::Base.connection.active?
+                                   'true'
+                                 else
+                                   'false'
+                                 end
+  end
+
+  def redis_metrics
+    r = Redis.new(Redis::Config.app)
+    if r.ping == 'PONG'
+      redis_server = r.info
+      @metrics['Redis alive'] = 'false'
+      @metrics['Redis version'] = redis_server['redis_version']
+      @metrics['Redis number of connected clients'] = redis_server['connected_clients']
+      @metrics["Redis 'maxclients' setting"] = redis_server['maxclients']
+      @metrics['Redis memory used'] = redis_server['used_memory_human']
+      @metrics['Redis memory peak'] = redis_server['used_memory_peak_human']
+      @metrics['Redis total memory available'] = redis_server['total_system_memory_human']
+      @metrics["Redis 'maxmemory' setting"] = redis_server['maxmemory']
+      @metrics["Redis 'maxmemory_policy' setting"] = redis_server['maxmemory_policy']
+    end
+  rescue Redis::CannotConnectError
+    @metrics['Redis alive'] = false
+  end
+end