Only update Prom apps specific to environment

app/services/prometheus/create_default_alerts_service.rb

@@ -53,7 +53,11 @@ module Prometheus
     end
 
     def schedule_prometheus_update
-      project.all_clusters.with_application_prometheus.each do |cluster|
+      clusters = project.all_clusters
+      clusters = clusters.with_application_prometheus
+      clusters = clusters.with_deployment_in_environment(environment)
+
+      clusters.each do |cluster|
         application = cluster.application_prometheus
         ::Clusters::Applications::ScheduleUpdateService.new(application, project).execute
       end

spec/services/prometheus/create_default_alerts_service_spec.rb

@@ -3,7 +3,7 @@
 require 'spec_helper'
 
 describe Prometheus::CreateDefaultAlertsService do
-  let_it_be(:project) { create(:project) }
+  let_it_be(:project) { create(:project, :repository) }
   let(:instance) { described_class.new(project: project) }
   let(:expected_alerts) { described_class::DEFAULT_ALERTS }
 
@@ -51,12 +51,16 @@ describe Prometheus::CreateDefaultAlertsService do
         end
 
         context 'cluster with prometheus exists' do
-          let!(:cluster) do
-            cluster = create(:cluster, :with_installed_prometheus)
-            cluster.projects << project
-            cluster
+          let!(:cluster) { create(:cluster, :with_installed_prometheus, projects: [project]) }
+
+          it 'does not schedule an update to prometheus' do
+            expect(::Clusters::Applications::ScheduleUpdateService).not_to receive(:new)
+            execute
           end
 
+          context 'deployment to relevant environment' do
+            let!(:deployment) { create(:deployment, cluster: cluster, environment: environment, sha: project.commit.id) }
+
             it 'schedules an update to prometheus' do
               expect_next_instance_of(::Clusters::Applications::ScheduleUpdateService) do |instance|
                 expect(instance).to receive(:execute)
@@ -65,6 +69,7 @@ describe Prometheus::CreateDefaultAlertsService do
               execute
             end
           end
+        end
 
         context 'multiple environments' do
           let!(:production) { create(:environment, project: project, name: 'production') }