diff --git a/lib/gitlab/metrics/dashboard/processor.rb b/lib/gitlab/metrics/dashboard/processor.rb
index 46fd2f9440d..cc34ac53051 100644
--- a/lib/gitlab/metrics/dashboard/processor.rb
+++ b/lib/gitlab/metrics/dashboard/processor.rb
@@ -14,17 +14,18 @@ module Gitlab
           Stages::Sorter
         ].freeze
 
-        def initialize(project, environment)
+        def initialize(project, environment, dashboard)
           @project = project
           @environment = environment
+          @dashboard = dashboard
         end
 
         # Returns a new dashboard hash with the results of
         # running transforms on the dashboard.
-        def process(raw_dashboard)
-          raw_dashboard.deep_symbolize_keys.tap do |dashboard|
+        def process
+          @dashboard.deep_symbolize_keys.tap do |dashboard|
             sequence.each do |stage|
-              stage.new(@project, @environment).transform!(dashboard)
+              stage.new(@project, @environment, dashboard).transform!
             end
           end
         end
diff --git a/lib/gitlab/metrics/dashboard/service.rb b/lib/gitlab/metrics/dashboard/service.rb
index b8f144a7222..79d563cce4f 100644
--- a/lib/gitlab/metrics/dashboard/service.rb
+++ b/lib/gitlab/metrics/dashboard/service.rb
@@ -32,7 +32,7 @@ module Gitlab
 
         # Returns a new dashboard Hash, supplemented with DB info
         def process_dashboard(dashboard)
-          Gitlab::Metrics::Dashboard::Processor.new(project, params[:environment]).process(dashboard)
+          Gitlab::Metrics::Dashboard::Processor.new(project, params[:environment], dashboard).process
         end
       end
     end
diff --git a/lib/gitlab/metrics/dashboard/stages/base_stage.rb b/lib/gitlab/metrics/dashboard/stages/base_stage.rb
index daecb2698ae..dd4aae6c115 100644
--- a/lib/gitlab/metrics/dashboard/stages/base_stage.rb
+++ b/lib/gitlab/metrics/dashboard/stages/base_stage.rb
@@ -9,18 +9,16 @@ module Gitlab
 
           DEFAULT_PANEL_TYPE = 'area-chart'
 
-          attr_reader :project, :environment
+          attr_reader :project, :environment, :dashboard
 
-          def initialize(project, environment)
+          def initialize(project, environment, dashboard)
             @project = project
             @environment = environment
+            @dashboard = dashboard
           end
 
           # Entry-point to the stage
-          # @param dashboard [Hash]
-          # @param project [Project]
-          # @param environment [Environment]
-          def transform!(_dashboard)
+          def transform!
             raise NotImplementedError
           end
 
diff --git a/lib/gitlab/metrics/dashboard/stages/common_metrics_inserter.rb b/lib/gitlab/metrics/dashboard/stages/common_metrics_inserter.rb
index 20e6b98e20b..3406021bbea 100644
--- a/lib/gitlab/metrics/dashboard/stages/common_metrics_inserter.rb
+++ b/lib/gitlab/metrics/dashboard/stages/common_metrics_inserter.rb
@@ -8,7 +8,7 @@ module Gitlab
           # For each metric in the dashboard config, attempts to
           # find a corresponding database record. If found,
           # includes the record's id in the dashboard config.
-          def transform!(dashboard)
+          def transform!
             common_metrics = ::PrometheusMetric.common
 
             for_metrics(dashboard) do |metric|
diff --git a/lib/gitlab/metrics/dashboard/stages/project_metrics_inserter.rb b/lib/gitlab/metrics/dashboard/stages/project_metrics_inserter.rb
index 0dc87f1ec16..221610a14d1 100644
--- a/lib/gitlab/metrics/dashboard/stages/project_metrics_inserter.rb
+++ b/lib/gitlab/metrics/dashboard/stages/project_metrics_inserter.rb
@@ -8,7 +8,7 @@ module Gitlab
           # Inserts project-specific metrics into the dashboard
           # config. If there are no project-specific metrics,
           # this will have no effect.
-          def transform!(dashboard)
+          def transform!
             project.prometheus_metrics.each do |project_metric|
               group = find_or_create_panel_group(dashboard[:panel_groups], project_metric)
               panel = find_or_create_panel(group[:panels], project_metric)
diff --git a/lib/gitlab/metrics/dashboard/stages/sorter.rb b/lib/gitlab/metrics/dashboard/stages/sorter.rb
index 9c4183fff99..ba5aa78059c 100644
--- a/lib/gitlab/metrics/dashboard/stages/sorter.rb
+++ b/lib/gitlab/metrics/dashboard/stages/sorter.rb
@@ -5,22 +5,22 @@ module Gitlab
     module Dashboard
       module Stages
         class Sorter < BaseStage
-          def transform!(dashboard)
+          def transform!
             missing_panel_groups! unless dashboard[:panel_groups].is_a? Array
 
-            sort_groups!(dashboard)
-            sort_panels!(dashboard)
+            sort_groups!
+            sort_panels!
           end
 
           private
 
           # Sorts the groups in the dashboard by the :priority key
-          def sort_groups!(dashboard)
+          def sort_groups!
             dashboard[:panel_groups] = dashboard[:panel_groups].sort_by { |group| -group[:priority].to_i }
           end
 
           # Sorts the panels in the dashboard by the :weight key
-          def sort_panels!(dashboard)
+          def sort_panels!
             dashboard[:panel_groups].each do |group|
               missing_panels! unless group[:panels].is_a? Array
 
diff --git a/spec/lib/gitlab/metrics/dashboard/processor_spec.rb b/spec/lib/gitlab/metrics/dashboard/processor_spec.rb
index e27ba2f1f4e..ee7c93fce8d 100644
--- a/spec/lib/gitlab/metrics/dashboard/processor_spec.rb
+++ b/spec/lib/gitlab/metrics/dashboard/processor_spec.rb
@@ -8,8 +8,8 @@ describe Gitlab::Metrics::Dashboard::Processor do
   let(:dashboard_yml) { YAML.load_file('spec/fixtures/lib/gitlab/metrics/dashboard/sample_dashboard.yml') }
 
   describe 'process' do
-    let(:process_params) { [project, environment] }
-    let(:dashboard) { described_class.new(*process_params).process(dashboard_yml) }
+    let(:process_params) { [project, environment, dashboard_yml] }
+    let(:dashboard) { described_class.new(*process_params).process }
 
     context 'when dashboard config corresponds to common metrics' do
       let!(:common_metric) { create(:prometheus_metric, :common, identifier: 'metric_a1') }