Adds integration test for the _health_report and _node/plugins APIs. (#18306) (#18310)

* Adds integration test for the _health_report API.

* Add _node/plugins API integration test.

(cherry picked from commit 08f4c52)

Co-authored-by: Mashhur <[email protected]>

Author: mergify[bot]

qa/integration/services/monitoring_api.rb

@@ -74,4 +74,14 @@ def logging_reset
     resp = Manticore.put("http://localhost:#{@port}/_node/logging/reset", {headers: {"Content-Type" => "application/json"}}).body
     JSON.parse(resp)
   end
+
+  def health_report
+    resp = Manticore.get("http://localhost:#{@port}/_health_report").body
+    JSON.parse(resp)
+  end
+
+  def node_plugins
+    resp = Manticore.get("http://localhost:#{@port}/_node/plugins").body
+    JSON.parse(resp)
+  end
 end

qa/integration/specs/monitoring_api_spec.rb

@@ -205,6 +205,42 @@
     end
   end
 
+  it 'retrieves health report' do
+    logstash_service = @fixture.get_service("logstash")
+    logstash_service.start_with_stdin
+    logstash_service.wait_for_logstash
+    Stud.try(max_retry.times, [StandardError, RSpec::Expectations::ExpectationNotMetError]) do
+      # health_report can fail if the subsystem isn't ready
+      result = logstash_service.monitoring_api.health_report rescue nil
+      expect(result).not_to be_nil
+      expect(result).to be_a(Hash)
+      expect(result).to include("status")
+      expect(result["status"]).to match(/^(green|yellow|red)$/)
+    end
+  end
+
+  it 'retrieves node plugins information' do
+    logstash_service = @fixture.get_service("logstash")
+    logstash_service.start_with_stdin
+    logstash_service.wait_for_logstash
+    Stud.try(max_retry.times, [StandardError, RSpec::Expectations::ExpectationNotMetError]) do
+      # node_plugins can fail if the subsystem isn't ready
+      result = logstash_service.monitoring_api.node_plugins rescue nil
+      expect(result).not_to be_nil
+      expect(result).to be_a(Hash)
+      expect(result).to include("plugins")
+      plugins = result["plugins"]
+      expect(plugins).to be_a(Array)
+      expect(plugins.size).to be > 0
+      # verify plugin structure and that stdin plugin is present
+      stdin_plugin = plugins.find { |p| p["name"] == "logstash-input-stdin" }
+      expect(stdin_plugin).not_to be_nil
+      expect(stdin_plugin).to include("name")
+      expect(stdin_plugin["name"]).to eq("logstash-input-stdin")
+      expect(stdin_plugin).to include("version")
+    end
+  end
+
   shared_examples "pipeline metrics" do
     # let(:pipeline_id) { defined?(super()) or fail NotImplementedError }
     let(:settings_overrides) do