Add CountBoardsMetric

config/metrics/counts_all/20210216181252_boards.yml

 ---
 key_path: counts.boards
-description: Count of total Boards created 
+description: Count of Boards created
 product_section: dev
 product_stage: plan
 product_group: group::project management
-product_category: boards 
+product_category: boards
 value_type: number
 status: data_available
 time_frame: all
 data_source: database
+instrumentation_class: 'Gitlab::Usage::Metrics::Instrumentations::CountBoardsMetric'
 distribution:
 - ce
-- ee 
+- ee
 tier:
 - free
-- premium 
-- ultimate 
+- premium
+- ultimate

doc/development/usage_ping/dictionary.md

@@ -468,7 +468,7 @@ Tiers: `free`
 
 ### `counts.boards`
 
-Count of total Boards created
+Count of Boards created
 
 [YAML definition](https://gitlab.com/gitlab-org/gitlab/-/blob/master/config/metrics/counts_all/20210216181252_boards.yml)
 

lib/gitlab/usage/metrics/instrumentations/count_boards_metric.rb

+# frozen_string_literal: true
+
+module Gitlab
+  module Usage
+    module Metrics
+      module Instrumentations
+        class CountBoardsMetric < DatabaseMetric
+          operation :count
+
+          relation { Board }
+        end
+      end
+    end
+  end
+end

spec/lib/gitlab/usage/metrics/instrumentations/count_boards_metric_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::Usage::Metrics::Instrumentations::CountBoardsMetric do
+  let_it_be(:board) { create(:board) }
+
+  it_behaves_like 'a correct instrumented metric value', { time_frame: 'all', data_source: 'database' }, 1
+end

spec/lib/gitlab/usage_data_metrics_spec.rb

@@ -20,6 +20,10 @@ RSpec.describe Gitlab::UsageDataMetrics do
       it 'includes top level keys' do
         expect(subject).to include(:uuid)
       end
+
+      it 'includes counts keys' do
+        expect(subject[:counts]).to include(:boards)
+      end
     end
   end
 end