Add test checking if prometheus integration is enabled after prometheus is installed

app/models/clusters/applications/prometheus.rb

@@ -10,6 +10,15 @@ module Clusters
 
       default_value_for :version, VERSION
 
+      state_machine :status do
+        after_transition any => [:installed] do |application|
+          application.cluster.projects.each do |project|
+            # raise "exe"
+            project.prometheus_service&.update(active: true)
+          end
+        end
+      end
+
       def chart
         'stable/prometheus'
       end

app/models/project_services/prometheus_service.rb

+module Gitlab
+  PrometheusError = Class.new(StandardError)
+end
+
 class PrometheusService < MonitoringService
   include ReactiveService
 
@@ -8,7 +12,6 @@ class PrometheusService < MonitoringService
   #  Access to prometheus is directly through the API
   prop_accessor :api_url
   boolean_accessor :manual_configuration
-  boolean_accessor :prometheus_installed
 
   with_options presence: true, if: :manual_configuration? do
     validates :api_url, url: true
@@ -18,10 +21,9 @@ class PrometheusService < MonitoringService
 
   after_save :clear_reactive_cache!
 
-
   def initialize_properties
     if properties.nil?
-      self.properties = { prometheus_installed: false }
+      self.properties = { }
     end
   end
 
@@ -54,7 +56,6 @@ class PrometheusService < MonitoringService
           }
         ]
       },
-
       {
         type: 'text',
         name: 'api_url',
@@ -126,6 +127,10 @@ class PrometheusService < MonitoringService
     end
   end
 
+  def prometheus_installed?
+    cluster_with_prometheus.present?
+  end
+
   private
 
   def cluster_with_prometheus(environment_id = nil)
@@ -135,7 +140,7 @@ class PrometheusService < MonitoringService
                  project.clusters.enabled.select { |c| c.environment_scope == '*' || c.environment_scope == '' }
                end
 
-    clusters.detect { |cluster| cluster.application_prometheus.installed? }
+    clusters.detect { |cluster| cluster.application_prometheus&.installed? }
   end
 
   def rename_data_to_metrics(metrics)
@@ -144,7 +149,8 @@ class PrometheusService < MonitoringService
   end
 
   def synchronize_service_state!
-    self.active = prometheus_installed? || manual_configuration? || cluster_with_prometheus.present?
-    self.prometheus_installed = !manual_configuration? && cluster_with_prometheus.present?
+    self.active = prometheus_installed? || self.manual_configuration?
+
+    true
   end
 end

app/views/projects/services/prometheus/_help.html.haml

+.row.prepend-top-default.append-bottom-default
+  %p
+    - unless @service.manual_configuration?
+      - if @service.prometheus_installed?
+        = link_to 'Manage installed Prometheus', project_clusters_path(@project), class: 'btn btn-cancel'
+      - else
+        = link_to 'Install Prometheus', project_clusters_path(@project), class: 'btn btn-cancel'
+    - else
+      To automatically install prometheus disable manual configuration
+

lib/gitlab/prometheus/queries/environment_query.rb

@@ -2,8 +2,7 @@ module Gitlab
   module Prometheus
     module Queries
       class EnvironmentQuery < BaseQuery
-        def query(environment_id)
-          ::Environment.find_by(id: environment_id).try do |environment|
+        def query
           environment_slug = environment.slug
           timeframe_start = 8.hours.ago.to_f
           timeframe_end = Time.now.to_f
@@ -21,5 +20,4 @@ module Gitlab
       end
     end
   end
-  end
 end

lib/gitlab/prometheus/queries/matched_metrics_query.rb

@@ -4,7 +4,7 @@ module Gitlab
       class MatchedMetricsQuery < BaseQuery
         MAX_QUERY_ITEMS = 40.freeze
 
-        def query
+        def query(_ = nil)
           groups_data.map do |group, data|
             {
               group: group.name,

spec/lib/gitlab/prometheus/queries/additional_metrics_deployment_query_spec.rb

@@ -7,7 +7,7 @@ describe Gitlab::Prometheus::Queries::AdditionalMetricsDeploymentQuery do
 
   include_examples 'additional metrics query' do
     let(:deployment) { create(:deployment, environment: environment) }
-    let(:query_params) { [deployment.id] }
+    let(:query_params) { [environment.id, deployment.id] }
 
     it 'queries using specific time' do
       expect(client).to receive(:query_range).with(anything,

spec/lib/gitlab/prometheus/queries/deployment_query_spec.rb

@@ -31,7 +31,7 @@ describe Gitlab::Prometheus::Queries::DeploymentQuery do
     expect(client).to receive(:query).with('avg(rate(container_cpu_usage_seconds_total{container_name!="POD",environment="environment-slug"}[30m])) * 100',
                                            time: stop_time)
 
-    expect(subject.query(deployment.id)).to eq(memory_values: nil, memory_before: nil, memory_after: nil,
+    expect(subject.query(environment.id, deployment.id)).to eq(memory_values: nil, memory_before: nil, memory_after: nil,
                                                cpu_values: nil, cpu_before: nil, cpu_after: nil)
   end
 end

spec/models/clusters/applications/prometheus_spec.rb

@@ -6,6 +6,24 @@ describe Clusters::Applications::Prometheus do
 
   include_examples 'cluster application specs', described_class
 
+  describe 'transition to installed' do
+    let(:project) { create(:project) }
+    let(:cluster) { create(:cluster, projects: [project]) }
+    let(:prometheus_service) { double('prometheus_service') }
+
+    subject { create(:clusters_applications_prometheus, :installing, cluster: cluster) }
+
+    before do
+      allow(project).to receive(:prometheus_service).and_return prometheus_service
+    end
+
+    it 'ensures Prometheus service is activated' do
+      expect(prometheus_service).to receive(:update).with(active: true)
+
+      subject.make_installed
+    end
+  end
+
   describe "#chart_values_file" do
     subject { create(:clusters_applications_prometheus).chart_values_file }