Fix Canary Ingress weight is not reflected on UI immediately

This commit fixes the caching issue that the cached rollout status
is being used even after the entity is updated.

app/models/environment.rb

@@ -405,6 +405,11 @@ class Environment < ApplicationRecord
     deployment_platform.patch_ingress(deployment_namespace, ingress, data)
   end
 
+  def clear_all_caches
+    expire_etag_cache
+    clear_reactive_cache!
+  end
+
   private
 
   def rollout_status_available?

app/services/environments/canary_ingress/update_service.rb

@@ -24,6 +24,7 @@ module Environments
         end
 
         if environment.patch_ingress(canary_ingress, patch_data)
+          environment.clear_all_caches
           success
         else
           error(_('Failed to update the Canary Ingress.'), :bad_request)

changelogs/unreleased/fix-canary-update-service-to-invalidate-cache.yml

+---
+title: Fix Canary Ingress weight is not reflected on UI immediately
+merge_request: 50246
+author:
+type: fixed

spec/models/environment_spec.rb

@@ -1547,4 +1547,18 @@ RSpec.describe Environment, :use_clean_rails_memory_store_caching do
       end
     end
   end
+
+  describe '#clear_all_caches' do
+    subject { environment.clear_all_caches }
+
+    it 'clears all caches on the environment' do
+      expect_next_instance_of(Gitlab::EtagCaching::Store) do |store|
+        expect(store).to receive(:touch).with(environment.etag_cache_key)
+      end
+
+      expect(environment).to receive(:clear_reactive_cache!)
+
+      subject
+    end
+  end
 end

spec/services/environments/canary_ingress/update_service_spec.rb

@@ -117,6 +117,12 @@ RSpec.describe Environments::CanaryIngress::UpdateService, :clean_gitlab_redis_c
           expect(subject[:status]).to eq(:success)
           expect(subject[:message]).to be_nil
         end
+
+        it 'clears all caches' do
+          expect(environment).to receive(:clear_all_caches)
+
+          subject
+        end
       end
 
       context 'when patch request does not succeed' do