Remove InfluxDB username/password

InfluxDB over UDP doesn't use authentication, thus there's no need for
these settings.

app/controllers/admin/application_settings_controller.rb

@@ -70,8 +70,6 @@ class Admin::ApplicationSettingsController < Admin::ApplicationController
       :metrics_enabled,
       :metrics_host,
       :metrics_port,
-      :metrics_username,
-      :metrics_password,
       :metrics_pool_size,
       :metrics_timeout,
       :metrics_method_call_threshold,

app/views/admin/application_settings/_form.html.haml

@@ -179,14 +179,6 @@
           your server configuration specifies a database to store data in when
           sending messages to this port, without it metrics data will not be
           saved.
-    .form-group
-      = f.label :metrics_username, 'InfluxDB username', class: 'control-label col-sm-2'
-      .col-sm-10
-        = f.text_field :metrics_username, class: 'form-control'
-    .form-group
-      = f.label :metrics_password, 'InfluxDB password', class: 'control-label col-sm-2'
-      .col-sm-10
-        = f.text_field :metrics_password, class: 'form-control'
     .form-group
       = f.label :metrics_pool_size, 'Connection pool size', class: 'control-label col-sm-2'
       .col-sm-10

db/migrate/20160106164438_remove_influxdb_credentials.rb

+class RemoveInfluxdbCredentials < ActiveRecord::Migration
+  def change
+    remove_column :application_settings, :metrics_username, :string
+    remove_column :application_settings, :metrics_password, :string
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20151229112614) do
+ActiveRecord::Schema.define(version: 20160106164438) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -54,8 +54,6 @@ ActiveRecord::Schema.define(version: 20151229112614) do
     t.integer  "two_factor_grace_period",           default: 48
     t.boolean  "metrics_enabled",                   default: false
     t.string   "metrics_host",                      default: "localhost"
-    t.string   "metrics_username"
-    t.string   "metrics_password"
     t.integer  "metrics_pool_size",                 default: 16
     t.integer  "metrics_timeout",                   default: 10
     t.integer  "metrics_method_call_threshold",     default: 10

lib/gitlab/metrics.rb

@@ -13,8 +13,6 @@ module Gitlab
         timeout:               current_application_settings[:metrics_timeout],
         method_call_threshold: current_application_settings[:metrics_method_call_threshold],
         host:                  current_application_settings[:metrics_host],
-        username:              current_application_settings[:metrics_username],
-        password:              current_application_settings[:metrics_password],
         port:                  current_application_settings[:metrics_port]
       }
     end
@@ -90,12 +88,10 @@ module Gitlab
     if enabled?
       @pool = ConnectionPool.new(size: settings[:pool_size], timeout: settings[:timeout]) do
         host = settings[:host]
-        user = settings[:username]
-        pw   = settings[:password]
         port = settings[:port]
 
         InfluxDB::Client.
-          new(udp: { host: host, port: port }, username: user, password: pw)
+          new(udp: { host: host, port: port })
       end
     end
   end