Remove join through projects

app/models/project.rb

@@ -435,7 +435,6 @@ class Project < ApplicationRecord
   scope :with_merge_requests_available_for_user, ->(current_user) { with_feature_available_for_user(:merge_requests, current_user) }
   scope :with_merge_requests_enabled, -> { with_feature_enabled(:merge_requests) }
   scope :with_remote_mirrors, -> { joins(:remote_mirrors).where(remote_mirrors: { enabled: true }).distinct }
-  scope :with_grafana_integration_enabled, -> { joins(:grafana_integration).where(grafana_integrations: { enabled: true }) }
 
   scope :with_group_runners_enabled, -> do
     joins(:ci_cd_settings)

lib/gitlab/grafana_embed_usage_data.rb

@@ -5,9 +5,9 @@ module Gitlab
     class << self
       def issue_count
         # rubocop:disable CodeReuse/ActiveRecord
-        Issue.joins(project: :grafana_integration)
-          .merge(Project.with_grafana_integration_enabled)
+        Issue.joins('JOIN grafana_integrations USING (project_id)')
           .where("issues.description LIKE '%' || grafana_integrations.grafana_url || '%'")
+          .where(grafana_integrations: { enabled: true })
           .count
         # rubocop:enable CodeReuse/ActiveRecord
       end