diff --git a/app/models/clusters/applications/jupyter.rb b/app/models/clusters/applications/jupyter.rb
index 7be6a14f585..e43a0fd1786 100644
--- a/app/models/clusters/applications/jupyter.rb
+++ b/app/models/clusters/applications/jupyter.rb
@@ -19,7 +19,7 @@ module Clusters
       def set_initial_status
         return unless not_installable?
 
-        if cluster&.application_ingress_installed? && cluster.application_ingress.external_ip
+        if cluster&.application_ingress_available? && cluster.application_ingress.external_ip
           self.status = 'installable'
         end
       end
diff --git a/app/models/clusters/cluster.rb b/app/models/clusters/cluster.rb
index d7011ef447a..20d53b8e620 100644
--- a/app/models/clusters/cluster.rb
+++ b/app/models/clusters/cluster.rb
@@ -43,8 +43,9 @@ module Clusters
 
     delegate :active?, to: :platform_kubernetes, prefix: true, allow_nil: true
     delegate :rbac?, to: :platform_kubernetes, prefix: true, allow_nil: true
-    delegate :installed?, to: :application_helm, prefix: true, allow_nil: true
-    delegate :installed?, to: :application_ingress, prefix: true, allow_nil: true
+    delegate :available?, to: :application_helm, prefix: true, allow_nil: true
+    delegate :available?, to: :application_ingress, prefix: true, allow_nil: true
+    delegate :available?, to: :application_prometheus, prefix: true, allow_nil: true
 
     enum platform_type: {
       kubernetes: 1
diff --git a/app/models/clusters/concerns/application_core.rb b/app/models/clusters/concerns/application_core.rb
index e3deedfb036..683b45331f6 100644
--- a/app/models/clusters/concerns/application_core.rb
+++ b/app/models/clusters/concerns/application_core.rb
@@ -15,7 +15,7 @@ module Clusters
         def set_initial_status
           return unless not_installable?
 
-          self.status = 'installable' if cluster&.application_helm_installed?
+          self.status = 'installable' if cluster&.application_helm_available?
         end
 
         def self.application_name
diff --git a/app/models/clusters/concerns/application_status.rb b/app/models/clusters/concerns/application_status.rb
index a9df59fc059..93bdf9c223d 100644
--- a/app/models/clusters/concerns/application_status.rb
+++ b/app/models/clusters/concerns/application_status.rb
@@ -66,6 +66,10 @@ module Clusters
           end
         end
       end
+
+      def available?
+        installed? || updated?
+      end
     end
   end
 end
diff --git a/app/models/project_services/prometheus_service.rb b/app/models/project_services/prometheus_service.rb
index 509e5b6089b..f141502d5df 100644
--- a/app/models/project_services/prometheus_service.rb
+++ b/app/models/project_services/prometheus_service.rb
@@ -26,7 +26,7 @@ class PrometheusService < MonitoringService
   end
 
   def editable?
-    manual_configuration? || !prometheus_installed?
+    manual_configuration? || !prometheus_available?
   end
 
   def title
@@ -75,17 +75,17 @@ class PrometheusService < MonitoringService
     RestClient::Resource.new(api_url) if api_url && manual_configuration? && active?
   end
 
-  def prometheus_installed?
+  def prometheus_available?
     return false if template?
     return false unless project
 
-    project.clusters.enabled.any? { |cluster| cluster.application_prometheus&.installed? }
+    project.clusters.enabled.any? { |cluster| cluster.application_prometheus_available? }
   end
 
   private
 
   def synchronize_service_state
-    self.active = prometheus_installed? || manual_configuration?
+    self.active = prometheus_available? || manual_configuration?
 
     true
   end
diff --git a/app/views/projects/services/prometheus/_configuration_banner.html.haml b/app/views/projects/services/prometheus/_configuration_banner.html.haml
index 898b55e4b39..dfcb1c5d240 100644
--- a/app/views/projects/services/prometheus/_configuration_banner.html.haml
+++ b/app/views/projects/services/prometheus/_configuration_banner.html.haml
@@ -7,7 +7,7 @@
 - else
   .container-fluid
     .row
-      - if service.prometheus_installed?
+      - if service.prometheus_available?
         .col-sm-2
           .svg-container
             = image_tag 'illustrations/monitoring/getting_started.svg'
diff --git a/changelogs/unreleased/51972-prometheus-not-showing-as-installed-even-though-it-is.yml b/changelogs/unreleased/51972-prometheus-not-showing-as-installed-even-though-it-is.yml
new file mode 100644
index 00000000000..73b035fca00
--- /dev/null
+++ b/changelogs/unreleased/51972-prometheus-not-showing-as-installed-even-though-it-is.yml
@@ -0,0 +1,5 @@
+---
+title: Show available clusters when installed or updated
+merge_request: 22356
+author:
+type: fixed
diff --git a/spec/models/clusters/applications/ingress_spec.rb b/spec/models/clusters/applications/ingress_spec.rb
index c55953c8d22..1580ef36127 100644
--- a/spec/models/clusters/applications/ingress_spec.rb
+++ b/spec/models/clusters/applications/ingress_spec.rb
@@ -4,7 +4,7 @@ describe Clusters::Applications::Ingress do
   let(:ingress) { create(:clusters_applications_ingress) }
 
   include_examples 'cluster application core specs', :clusters_applications_ingress
-  include_examples 'cluster application status specs', :cluster_application_ingress
+  include_examples 'cluster application status specs', :clusters_applications_ingress
 
   before do
     allow(ClusterWaitForIngressIpAddressWorker).to receive(:perform_in)
diff --git a/spec/models/clusters/applications/prometheus_spec.rb b/spec/models/clusters/applications/prometheus_spec.rb
index f34b4ece8db..f9776acd4c8 100644
--- a/spec/models/clusters/applications/prometheus_spec.rb
+++ b/spec/models/clusters/applications/prometheus_spec.rb
@@ -4,7 +4,7 @@ describe Clusters::Applications::Prometheus do
   include KubernetesHelpers
 
   include_examples 'cluster application core specs', :clusters_applications_prometheus
-  include_examples 'cluster application status specs', :cluster_application_prometheus
+  include_examples 'cluster application status specs', :clusters_applications_prometheus
 
   describe '.installed' do
     subject { described_class.installed }
diff --git a/spec/models/clusters/applications/runner_spec.rb b/spec/models/clusters/applications/runner_spec.rb
index eda8d519f60..42448b42c8e 100644
--- a/spec/models/clusters/applications/runner_spec.rb
+++ b/spec/models/clusters/applications/runner_spec.rb
@@ -4,7 +4,7 @@ describe Clusters::Applications::Runner do
   let(:ci_runner) { create(:ci_runner) }
 
   include_examples 'cluster application core specs', :clusters_applications_runner
-  include_examples 'cluster application status specs', :cluster_application_runner
+  include_examples 'cluster application status specs', :clusters_applications_runner
 
   it { is_expected.to belong_to(:runner) }
 
diff --git a/spec/models/clusters/cluster_spec.rb b/spec/models/clusters/cluster_spec.rb
index 2727191eb9b..34d321ec604 100644
--- a/spec/models/clusters/cluster_spec.rb
+++ b/spec/models/clusters/cluster_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Clusters::Cluster do
@@ -15,8 +17,9 @@ describe Clusters::Cluster do
   it { is_expected.to delegate_method(:on_creation?).to(:provider) }
   it { is_expected.to delegate_method(:active?).to(:platform_kubernetes).with_prefix }
   it { is_expected.to delegate_method(:rbac?).to(:platform_kubernetes).with_prefix }
-  it { is_expected.to delegate_method(:installed?).to(:application_helm).with_prefix }
-  it { is_expected.to delegate_method(:installed?).to(:application_ingress).with_prefix }
+  it { is_expected.to delegate_method(:available?).to(:application_helm).with_prefix }
+  it { is_expected.to delegate_method(:available?).to(:application_ingress).with_prefix }
+  it { is_expected.to delegate_method(:available?).to(:application_prometheus).with_prefix }
   it { is_expected.to respond_to :project }
 
   describe '.enabled' do
diff --git a/spec/models/project_services/prometheus_service_spec.rb b/spec/models/project_services/prometheus_service_spec.rb
index 7afb1b4a8e3..f2cb927df37 100644
--- a/spec/models/project_services/prometheus_service_spec.rb
+++ b/spec/models/project_services/prometheus_service_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe PrometheusService, :use_clean_rails_memory_store_caching do
@@ -83,13 +85,22 @@ describe PrometheusService, :use_clean_rails_memory_store_caching do
     end
   end
 
-  describe '#prometheus_installed?' do
+  describe '#prometheus_available?' do
     context 'clusters with installed prometheus' do
       let!(:cluster) { create(:cluster, projects: [project]) }
       let!(:prometheus) { create(:clusters_applications_prometheus, :installed, cluster: cluster) }
 
       it 'returns true' do
-        expect(service.prometheus_installed?).to be(true)
+        expect(service.prometheus_available?).to be(true)
+      end
+    end
+
+    context 'clusters with updated prometheus' do
+      let!(:cluster) { create(:cluster, projects: [project]) }
+      let!(:prometheus) { create(:clusters_applications_prometheus, :updated, cluster: cluster) }
+
+      it 'returns true' do
+        expect(service.prometheus_available?).to be(true)
       end
     end
 
@@ -98,7 +109,7 @@ describe PrometheusService, :use_clean_rails_memory_store_caching do
       let!(:prometheus) { create(:clusters_applications_prometheus, cluster: cluster) }
 
       it 'returns false' do
-        expect(service.prometheus_installed?).to be(false)
+        expect(service.prometheus_available?).to be(false)
       end
     end
 
@@ -106,13 +117,13 @@ describe PrometheusService, :use_clean_rails_memory_store_caching do
       let(:cluster) { create(:cluster, projects: [project]) }
 
       it 'returns false' do
-        expect(service.prometheus_installed?).to be(false)
+        expect(service.prometheus_available?).to be(false)
       end
     end
 
     context 'no clusters' do
       it 'returns false' do
-        expect(service.prometheus_installed?).to be(false)
+        expect(service.prometheus_available?).to be(false)
       end
     end
   end
@@ -150,7 +161,7 @@ describe PrometheusService, :use_clean_rails_memory_store_caching do
 
     context 'with prometheus installed in the cluster' do
       before do
-        allow(service).to receive(:prometheus_installed?).and_return(true)
+        allow(service).to receive(:prometheus_available?).and_return(true)
       end
 
       context 'when service is inactive' do
diff --git a/spec/support/shared_examples/models/cluster_application_core_shared_examples.rb b/spec/support/shared_examples/models/cluster_application_core_shared_examples.rb
index 87d12a784ba..1f76b981292 100644
--- a/spec/support/shared_examples/models/cluster_application_core_shared_examples.rb
+++ b/spec/support/shared_examples/models/cluster_application_core_shared_examples.rb
@@ -11,60 +11,4 @@ shared_examples 'cluster application core specs' do |application_name|
       expect(Clusters::Cluster::APPLICATIONS[subject.name]).to eq(described_class)
     end
   end
-
-  describe 'status state machine' do
-    describe '#make_installing' do
-      subject { create(application_name, :scheduled) }
-
-      it 'is installing' do
-        subject.make_installing!
-
-        expect(subject).to be_installing
-      end
-    end
-
-    describe '#make_installed' do
-      subject { create(application_name, :installing) }
-
-      it 'is installed' do
-        subject.make_installed
-
-        expect(subject).to be_installed
-      end
-    end
-
-    describe '#make_errored' do
-      subject { create(application_name, :installing) }
-      let(:reason) { 'some errors' }
-
-      it 'is errored' do
-        subject.make_errored(reason)
-
-        expect(subject).to be_errored
-        expect(subject.status_reason).to eq(reason)
-      end
-    end
-
-    describe '#make_scheduled' do
-      subject { create(application_name, :installable) }
-
-      it 'is scheduled' do
-        subject.make_scheduled
-
-        expect(subject).to be_scheduled
-      end
-
-      describe 'when was errored' do
-        subject { create(application_name, :errored) }
-
-        it 'clears #status_reason' do
-          expect(subject.status_reason).not_to be_nil
-
-          subject.make_scheduled!
-
-          expect(subject.status_reason).to be_nil
-        end
-      end
-    end
-  end
 end
diff --git a/spec/support/shared_examples/models/cluster_application_status_shared_examples.rb b/spec/support/shared_examples/models/cluster_application_status_shared_examples.rb
index 765dd32f4ba..82f0dd5d00f 100644
--- a/spec/support/shared_examples/models/cluster_application_status_shared_examples.rb
+++ b/spec/support/shared_examples/models/cluster_application_status_shared_examples.rb
@@ -28,4 +28,87 @@ shared_examples 'cluster application status specs' do |application_name|
       end
     end
   end
+
+  describe 'status state machine' do
+    describe '#make_installing' do
+      subject { create(application_name, :scheduled) }
+
+      it 'is installing' do
+        subject.make_installing!
+
+        expect(subject).to be_installing
+      end
+    end
+
+    describe '#make_installed' do
+      subject { create(application_name, :installing) }
+
+      it 'is installed' do
+        subject.make_installed
+
+        expect(subject).to be_installed
+      end
+    end
+
+    describe '#make_errored' do
+      subject { create(application_name, :installing) }
+      let(:reason) { 'some errors' }
+
+      it 'is errored' do
+        subject.make_errored(reason)
+
+        expect(subject).to be_errored
+        expect(subject.status_reason).to eq(reason)
+      end
+    end
+
+    describe '#make_scheduled' do
+      subject { create(application_name, :installable) }
+
+      it 'is scheduled' do
+        subject.make_scheduled
+
+        expect(subject).to be_scheduled
+      end
+
+      describe 'when was errored' do
+        subject { create(application_name, :errored) }
+
+        it 'clears #status_reason' do
+          expect(subject.status_reason).not_to be_nil
+
+          subject.make_scheduled!
+
+          expect(subject.status_reason).to be_nil
+        end
+      end
+    end
+  end
+
+  describe '#available?' do
+    using RSpec::Parameterized::TableSyntax
+
+    where(:trait, :available) do
+      :not_installable  | false
+      :installable      | false
+      :scheduled        | false
+      :installing       | false
+      :installed        | true
+      :updating         | false
+      :updated          | true
+      :errored          | false
+      :update_errored   | false
+      :timeouted        | false
+    end
+
+    with_them do
+      subject { build(application_name, trait) }
+
+      if params[:available]
+        it { is_expected.to be_available }
+      else
+        it { is_expected.not_to be_available }
+      end
+    end
+  end
 end