Add alert assignee table, model, API support

Adds table and model for AlertManagement::AlertAssignee, which
will enable the association of users with alerts. This will
aide in triaging incoming alerts for a project.

This commit also adds the ability to read assignees for alerts
to the GraphQL API.

app/assets/javascripts/alert_management/components/alert_details.vue

@@ -15,11 +15,13 @@ import { s__ } from '~/locale';
 import query from '../graphql/queries/details.query.graphql';
 import { fetchPolicies } from '~/lib/graphql';
 import TimeAgoTooltip from '~/vue_shared/components/time_ago_tooltip.vue';
+import glFeatureFlagsMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
 import { ALERTS_SEVERITY_LABELS, trackAlertsDetailsViewsOptions } from '../constants';
 import createIssueQuery from '../graphql/mutations/create_issue_from_alert.graphql';
 import { visitUrl, joinPaths } from '~/lib/utils/url_utility';
 import Tracking from '~/tracking';
 import { toggleContainerClasses } from '~/lib/utils/dom_utils';
+import SystemNote from './system_notes/system_note.vue';
 import AlertSidebar from './alert_sidebar.vue';
 
 const containerEl = document.querySelector('.page-with-contextual-sidebar');
@@ -47,7 +49,9 @@ export default {
     GlTable,
     TimeAgoTooltip,
     AlertSidebar,
+    SystemNote,
   },
+  mixins: [glFeatureFlagsMixin()],
   props: {
     alertId: {
       type: String,
@@ -159,6 +163,9 @@ export default {
       const { category, action } = trackAlertsDetailsViewsOptions;
       Tracking.event(category, action);
     },
+    alertRefresh() {
+      this.$apollo.queries.alert.refetch();
+    },
   },
 };
 </script>
@@ -287,6 +294,13 @@ export default {
             </div>
             <div class="gl-pl-2" data-testid="service">{{ alert.service }}</div>
           </div>
+          <template v-if="glFeatures.alertAssignee">
+            <div v-if="alert.notes" class="issuable-discussion">
+              <ul class="notes main-notes-list timeline">
+                <system-note v-for="note in alert.notes.nodes" :key="note.id" :note="note" />
+              </ul>
+            </div>
+          </template>
         </gl-tab>
         <gl-tab data-testid="fullDetailsTab" :title="$options.i18n.fullAlertDetailsTitle">
           <gl-table
@@ -309,6 +323,7 @@ export default {
         :project-path="projectPath"
         :alert="alert"
         :sidebar-collapsed="sidebarCollapsed"
+        @alert-refresh="alertRefresh"
         @toggle-sidebar="toggleSidebar"
         @alert-sidebar-error="handleAlertSidebarError"
       />

app/assets/javascripts/alert_management/components/alert_sidebar.vue

@@ -53,6 +53,7 @@ export default {
         v-if="glFeatures.alertAssignee"
         :project-path="projectPath"
         :alert="alert"
+        @alert-refresh="$emit('alert-refresh')"
         @toggle-sidebar="$emit('toggle-sidebar')"
         @alert-sidebar-error="$emit('alert-sidebar-error', $event)"
       />

app/assets/javascripts/alert_management/components/sidebar/sidebar_assignees.vue

@@ -141,6 +141,7 @@ export default {
         })
         .then(() => {
           this.hideDropdown();
+          this.$emit('alert-refresh');
         })
         .catch(() => {
           this.$emit('alert-sidebar-error', this.$options.UPDATE_ALERT_ASSIGNEES_ERROR);

app/assets/javascripts/alert_management/components/system_notes/system_note.vue

+<script>
+import NoteHeader from '~/notes/components/note_header.vue';
+import { spriteIcon } from '~/lib/utils/common_utils';
+
+export default {
+  components: {
+    NoteHeader,
+  },
+  props: {
+    note: {
+      type: Object,
+      required: true,
+    },
+  },
+  computed: {
+    noteAnchorId() {
+      return `note_${this.note?.id?.split('/').pop()}`;
+    },
+    iconHtml() {
+      return spriteIcon('user');
+    },
+  },
+};
+</script>
+
+<template>
+  <li :id="noteAnchorId" class="timeline-entry note system-note note-wrapper">
+    <div class="timeline-entry-inner">
+      <div class="timeline-icon" v-html="iconHtml"></div>
+      <div class="timeline-content">
+        <div class="note-header">
+          <note-header :author="note.author" :created-at="note.createdAt" :note-id="note.id">
+            <span v-html="note.bodyHtml"></span>
+          </note-header>
+        </div>
+      </div>
+    </div>
+  </li>
+</template>

app/assets/javascripts/alert_management/graphql/fragments/alert_note.fragment.graphql

+#import "~/graphql_shared/fragments/author.fragment.graphql"
+
+fragment AlertNote on Note {
+    id
+    author {
+        id
+        state
+        ...Author
+    }
+    body
+    bodyHtml
+    createdAt
+    discussion {
+        id
+    }
+}

app/assets/javascripts/alert_management/graphql/fragments/detailItem.fragment.graphql → app/assets/javascripts/alert_management/graphql/fragments/detail_item.fragment.graphql

 #import "./list_item.fragment.graphql"
+#import "./alert_note.fragment.graphql"
 
 fragment AlertDetailItem on AlertManagementAlert {
   ...AlertListItem
@@ -8,4 +9,9 @@ fragment AlertDetailItem on AlertManagementAlert {
   description
   updatedAt
   details
+  notes {
+    nodes {
+      ...AlertNote
+    }
+  }
 }

app/assets/javascripts/alert_management/graphql/queries/details.query.graphql

-#import "../fragments/detailItem.fragment.graphql"
+#import "../fragments/detail_item.fragment.graphql"
 
 query alertDetails($fullPath: ID!, $alertId: String) {
     project(fullPath: $fullPath) {

app/graphql/types/alert_management/alert_type.rb

@@ -6,6 +6,8 @@ module Types
       graphql_name 'AlertManagementAlert'
       description "Describes an alert from the project's Alert Management"
 
+      implements(Types::Notes::NoteableType)
+
       authorize :read_alert_management_alert
 
       field :iid,

app/graphql/types/notes/noteable_type.rb

@@ -19,6 +19,8 @@ module Types
             Types::SnippetType
           when ::DesignManagement::Design
             Types::DesignManagement::DesignType
+          when ::AlertManagement::Alert
+            Types::AlertManagement::AlertType
           else
             raise "Unknown GraphQL type for #{object}"
           end

app/models/alert_management/alert.rb

@@ -8,6 +8,7 @@ module AlertManagement
     include AtomicInternalId
     include ShaAttribute
     include Sortable
+    include Noteable
     include Gitlab::SQL::Pattern
 
     STATUSES = {
@@ -30,6 +31,9 @@ module AlertManagement
     has_many :alert_assignees, inverse_of: :alert
     has_many :assignees, through: :alert_assignees
 
+    has_many :notes, as: :noteable, inverse_of: :noteable, dependent: :delete_all # rubocop:disable Cop/ActiveRecordDependent
+    has_many :user_mentions, class_name: 'AlertManagement::AlertUserMention', foreign_key: :alert_management_alert_id
+
     has_internal_id :iid, scope: :project, init: ->(s) { s.project.alert_management_alerts.maximum(:iid) }
 
     sha_attribute :fingerprint

app/models/alert_management/alert_user_mention.rb

+# frozen_string_literal: true
+
+module AlertManagement
+  class AlertUserMention < UserMention
+    belongs_to :alert_management_alert, class_name: '::AlertManagement::Alert'
+    belongs_to :note
+  end
+end

app/models/note.rb

@@ -274,6 +274,10 @@ class Note < ApplicationRecord
     noteable_type == "Snippet"
   end
 
+  def for_alert_mangement_alert?
+    noteable_type == 'AlertManagement::Alert'
+  end
+
   def for_personal_snippet?
     noteable.is_a?(PersonalSnippet)
   end
@@ -396,7 +400,13 @@ class Note < ApplicationRecord
   end
 
   def noteable_ability_name
-    for_snippet? ? 'snippet' : noteable_type.demodulize.underscore
+    if for_snippet?
+      'snippet'
+    elsif for_alert_mangement_alert?
+      'alert_management_alert'
+    else
+      noteable_type.demodulize.underscore
+    end
   end
 
   def can_be_discussion_note?

app/services/alert_management/alerts/update_service.rb

@@ -19,9 +19,11 @@ module AlertManagement
         return error_no_updates if params.empty?
 
         filter_assignees
+        old_assignees = alert.assignees.to_a
 
         if alert.update(params)
-          assign_todo
+          process_assignement(old_assignees)
+
           success
         else
           error(alert.errors.full_messages.to_sentence)
@@ -32,29 +34,10 @@ module AlertManagement
 
       attr_reader :alert, :current_user, :params
 
-      def assign_todo
-        return unless assignee
-
-        todo_service.assign_alert(alert, assignee)
-      end
-
       def allowed?
         current_user.can?(:update_alert_management_alert, alert)
       end
 
-      def filter_assignees
-        return if params[:assignees].nil?
-
-        params[:assignees] = Array(assignee)
-      end
-
-      def assignee
-        strong_memoize(:assignee) do
-          # Take first assignee while multiple are not currently supported
-          params[:assignees]&.first
-        end
-      end
-
       def todo_service
         strong_memoize(:todo_service) do
           TodoService.new
@@ -76,6 +59,35 @@ module AlertManagement
       def error_no_updates
         error(_('Please provide attributes to update'))
       end
+
+      # ----- Assignee-related behavior ------
+      def filter_assignees
+        return if params[:assignees].nil?
+
+        params[:assignees] = Array(assignee)
+      end
+
+      def assignee
+        strong_memoize(:assignee) do
+          # Take first assignee while multiple are not currently supported
+          params[:assignees]&.first
+        end
+      end
+
+      def process_assignement(old_assignees)
+        assign_todo
+        add_assignee_system_note(old_assignees)
+      end
+
+      def assign_todo
+        return unless assignee
+
+        todo_service.assign_alert(alert, assignee)
+      end
+
+      def add_assignee_system_note(old_assignees)
+        SystemNoteService.change_issuable_assignees(alert, alert.project, current_user, old_assignees)
+      end
     end
   end
 end

changelogs/unreleased/alert-system-notes.yml

+---
+title: Add system note when assigning user to alert
+merge_request: 33217
+author:
+type: added

db/migrate/20200527170649_create_alert_management_alert_user_mentions.rb

+# frozen_string_literal: true
+
+class CreateAlertManagementAlertUserMentions < ActiveRecord::Migration[6.0]
+  DOWNTIME = false
+
+  def change
+    create_table :alert_management_alert_user_mentions do |t|
+      t.references :alert_management_alert, type: :bigint, index: false, null: false, foreign_key: { on_delete: :cascade }
+      t.bigint :note_id, null: true
+
+      t.integer    :mentioned_users_ids, array: true
+      t.integer    :mentioned_projects_ids, array: true
+      t.integer    :mentioned_groups_ids, array: true
+    end
+
+    add_index :alert_management_alert_user_mentions, [:note_id], where: 'note_id IS NOT NULL', unique: true, name: 'index_alert_user_mentions_on_note_id'
+    add_index :alert_management_alert_user_mentions, [:alert_management_alert_id], where: 'note_id IS NULL', unique: true, name: 'index_alert_user_mentions_on_alert_id'
+    add_index :alert_management_alert_user_mentions, [:alert_management_alert_id, :note_id], unique: true, name: 'index_alert_user_mentions_on_alert_id_and_note_id'
+  end
+end

db/migrate/20200605003204_add_foreign_key_to_alert_management_alert_user_mentions.rb

+# frozen_string_literal: true
+
+class AddForeignKeyToAlertManagementAlertUserMentions < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def up
+    with_lock_retries do
+      add_foreign_key :alert_management_alert_user_mentions, :notes, column: :note_id, on_delete: :cascade # rubocop:disable Migration/AddConcurrentForeignKey
+    end
+  end
+
+  def down
+    with_lock_retries do
+      remove_foreign_key :alert_management_alert_user_mentions, column: :note_id
+    end
+  end
+end

db/structure.sql

@@ -37,6 +37,24 @@ CREATE SEQUENCE public.alert_management_alert_assignees_id_seq
 
 ALTER SEQUENCE public.alert_management_alert_assignees_id_seq OWNED BY public.alert_management_alert_assignees.id;
 
+CREATE TABLE public.alert_management_alert_user_mentions (
+    id bigint NOT NULL,
+    alert_management_alert_id bigint NOT NULL,
+    note_id bigint,
+    mentioned_users_ids integer[],
+    mentioned_projects_ids integer[],
+    mentioned_groups_ids integer[]
+);
+
+CREATE SEQUENCE public.alert_management_alert_user_mentions_id_seq
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+ALTER SEQUENCE public.alert_management_alert_user_mentions_id_seq OWNED BY public.alert_management_alert_user_mentions.id;
+
 CREATE TABLE public.alert_management_alerts (
     id bigint NOT NULL,
     created_at timestamp with time zone NOT NULL,
@@ -7401,6 +7419,8 @@ ALTER TABLE ONLY public.abuse_reports ALTER COLUMN id SET DEFAULT nextval('publi
 
 ALTER TABLE ONLY public.alert_management_alert_assignees ALTER COLUMN id SET DEFAULT nextval('public.alert_management_alert_assignees_id_seq'::regclass);
 
+ALTER TABLE ONLY public.alert_management_alert_user_mentions ALTER COLUMN id SET DEFAULT nextval('public.alert_management_alert_user_mentions_id_seq'::regclass);
+
 ALTER TABLE ONLY public.alert_management_alerts ALTER COLUMN id SET DEFAULT nextval('public.alert_management_alerts_id_seq'::regclass);
 
 ALTER TABLE ONLY public.alerts_service_data ALTER COLUMN id SET DEFAULT nextval('public.alerts_service_data_id_seq'::regclass);
@@ -8045,6 +8065,9 @@ ALTER TABLE ONLY public.abuse_reports
 ALTER TABLE ONLY public.alert_management_alert_assignees
     ADD CONSTRAINT alert_management_alert_assignees_pkey PRIMARY KEY (id);
 
+ALTER TABLE ONLY public.alert_management_alert_user_mentions
+    ADD CONSTRAINT alert_management_alert_user_mentions_pkey PRIMARY KEY (id);
+
 ALTER TABLE ONLY public.alert_management_alerts
     ADD CONSTRAINT alert_management_alerts_pkey PRIMARY KEY (id);
 
@@ -9194,6 +9217,12 @@ CREATE UNIQUE INDEX index_alert_management_alerts_on_project_id_and_fingerprint
 
 CREATE UNIQUE INDEX index_alert_management_alerts_on_project_id_and_iid ON public.alert_management_alerts USING btree (project_id, iid);
 
+CREATE UNIQUE INDEX index_alert_user_mentions_on_alert_id ON public.alert_management_alert_user_mentions USING btree (alert_management_alert_id) WHERE (note_id IS NULL);
+
+CREATE UNIQUE INDEX index_alert_user_mentions_on_alert_id_and_note_id ON public.alert_management_alert_user_mentions USING btree (alert_management_alert_id, note_id);
+
+CREATE UNIQUE INDEX index_alert_user_mentions_on_note_id ON public.alert_management_alert_user_mentions USING btree (note_id) WHERE (note_id IS NOT NULL);
+
 CREATE INDEX index_alerts_service_data_on_service_id ON public.alerts_service_data USING btree (service_id);
 
 CREATE INDEX index_allowed_email_domains_on_group_id ON public.allowed_email_domains USING btree (group_id);
@@ -12391,6 +12420,9 @@ ALTER TABLE ONLY public.design_user_mentions
 ALTER TABLE ONLY public.clusters_kubernetes_namespaces
     ADD CONSTRAINT fk_rails_8df789f3ab FOREIGN KEY (environment_id) REFERENCES public.environments(id) ON DELETE SET NULL;
 
+ALTER TABLE ONLY public.alert_management_alert_user_mentions
+    ADD CONSTRAINT fk_rails_8e48eca0fe FOREIGN KEY (alert_management_alert_id) REFERENCES public.alert_management_alerts(id) ON DELETE CASCADE;
+
 ALTER TABLE ONLY public.project_daily_statistics
     ADD CONSTRAINT fk_rails_8e549b272d FOREIGN KEY (project_id) REFERENCES public.projects(id) ON DELETE CASCADE;
 
@@ -12769,6 +12801,9 @@ ALTER TABLE ONLY public.merge_request_blocks
 ALTER TABLE ONLY public.protected_branch_unprotect_access_levels
     ADD CONSTRAINT fk_rails_e9eb8dc025 FOREIGN KEY (protected_branch_id) REFERENCES public.protected_branches(id) ON DELETE CASCADE;
 
+ALTER TABLE ONLY public.alert_management_alert_user_mentions
+    ADD CONSTRAINT fk_rails_eb2de0cdef FOREIGN KEY (note_id) REFERENCES public.notes(id) ON DELETE CASCADE;
+
 ALTER TABLE ONLY public.ci_daily_report_results
     ADD CONSTRAINT fk_rails_ebc2931b90 FOREIGN KEY (project_id) REFERENCES public.projects(id) ON DELETE CASCADE;
 
@@ -13873,6 +13908,7 @@ COPY "schema_migrations" (version) FROM STDIN;
 20200527151413
 20200527152116
 20200527152657
+20200527170649
 20200527211000
 20200528054112
 20200528123703
@@ -13886,6 +13922,7 @@ COPY "schema_migrations" (version) FROM STDIN;
 20200604145731
 20200604174544
 20200604174558
+20200605003204
 20200608072931
 20200608075553
 20200609002841

doc/api/graphql/reference/gitlab_schema.graphql

@@ -168,7 +168,7 @@ type AdminSidekiqQueuesDeleteJobsPayload {
 """
 Describes an alert from the project's Alert Management
 """
-type AlertManagementAlert {
+type AlertManagementAlert implements Noteable {
   """
   Assignees of the alert
   """
@@ -209,6 +209,31 @@ type AlertManagementAlert {
   """
   details: JSON
 
+  """
+  All discussions on this noteable
+  """
+  discussions(
+    """
+    Returns the elements in the list that come after the specified cursor.
+    """
+    after: String
+
+    """
+    Returns the elements in the list that come before the specified cursor.
+    """
+    before: String
+
+    """
+    Returns the first _n_ elements from the list.
+    """
+    first: Int
+
+    """
+    Returns the last _n_ elements from the list.
+    """
+    last: Int
+  ): DiscussionConnection!
+
   """
   Timestamp the alert ended
   """
@@ -239,6 +264,31 @@ type AlertManagementAlert {
   """
   monitoringTool: String
 
+  """
+  All notes on this noteable
+  """
+  notes(
+    """
+    Returns the elements in the list that come after the specified cursor.
+    """
+    after: String
+
+    """
+    Returns the elements in the list that come before the specified cursor.
+    """
+    before: String
+
+    """
+    Returns the first _n_ elements from the list.
+    """
+    first: Int
+
+    """
+    Returns the last _n_ elements from the list.
+    """
+    last: Int
+  ): NoteConnection!
+
   """
   Service the alert came from
   """

doc/api/graphql/reference/gitlab_schema.json

@@ -577,6 +577,63 @@
               "isDeprecated": false,
               "deprecationReason": null
             },
+            {
+              "name": "discussions",
+              "description": "All discussions on this noteable",
+              "args": [
+                {
+                  "name": "after",
+                  "description": "Returns the elements in the list that come after the specified cursor.",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "String",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                },
+                {
+                  "name": "before",
+                  "description": "Returns the elements in the list that come before the specified cursor.",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "String",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                },
+                {
+                  "name": "first",
+                  "description": "Returns the first _n_ elements from the list.",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "Int",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                },
+                {
+                  "name": "last",
+                  "description": "Returns the last _n_ elements from the list.",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "Int",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                }
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "OBJECT",
+                  "name": "DiscussionConnection",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
             {
               "name": "endedAt",
               "description": "Timestamp the alert ended",
@@ -673,6 +730,63 @@
               "isDeprecated": false,
               "deprecationReason": null
             },
+            {
+              "name": "notes",
+              "description": "All notes on this noteable",
+              "args": [
+                {
+                  "name": "after",
+                  "description": "Returns the elements in the list that come after the specified cursor.",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "String",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                },
+                {
+                  "name": "before",
+                  "description": "Returns the elements in the list that come before the specified cursor.",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "String",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                },
+                {
+                  "name": "first",
+                  "description": "Returns the first _n_ elements from the list.",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "Int",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                },
+                {
+                  "name": "last",
+                  "description": "Returns the last _n_ elements from the list.",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "Int",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                }
+              ],
+              "type": {
+                "kind": "NON_NULL",
+                "name": null,
+                "ofType": {
+                  "kind": "OBJECT",
+                  "name": "NoteConnection",
+                  "ofType": null
+                }
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
             {
               "name": "service",
               "description": "Service the alert came from",
@@ -760,7 +874,11 @@
           ],
           "inputFields": null,
           "interfaces": [
-
+            {
+              "kind": "INTERFACE",
+              "name": "Noteable",
+              "ofType": null
+            }
           ],
           "enumValues": null,
           "possibleTypes": null
@@ -23585,6 +23703,11 @@
           "interfaces": null,
           "enumValues": null,
           "possibleTypes": [
+            {
+              "kind": "OBJECT",
+              "name": "AlertManagementAlert",
+              "ofType": null
+            },
             {
               "kind": "OBJECT",
               "name": "Design",

spec/factories/notes.rb

@@ -17,6 +17,7 @@ FactoryBot.define do
     factory :note_on_project_snippet,    traits: [:on_project_snippet]
     factory :note_on_personal_snippet,   traits: [:on_personal_snippet]
     factory :note_on_design,             traits: [:on_design]
+    factory :note_on_alert,              traits: [:on_alert]
     factory :system_note,                traits: [:system]
 
     factory :discussion_note, class: 'DiscussionNote'
@@ -145,6 +146,10 @@ FactoryBot.define do
       end
     end
 
+    trait :on_alert do
+      noteable { association(:alert_management_alert, project: project) }
+    end
+
     trait :resolved do
       resolved_at { Time.now }
       resolved_by { association(:user) }

spec/frontend/alert_management/components/alert_management_system_note_spec.js

+import { shallowMount } from '@vue/test-utils';
+import SystemNote from '~/alert_management/components/system_notes/system_note.vue';
+import mockAlerts from '../mocks/alerts.json';
+
+const mockAlert = mockAlerts[1];
+
+describe('Alert Details System Note', () => {
+  let wrapper;
+
+  function mountComponent({ stubs = {} } = {}) {
+    wrapper = shallowMount(SystemNote, {
+      propsData: {
+        note: { ...mockAlert.notes.nodes[0] },
+      },
+      stubs,
+    });
+  }
+
+  afterEach(() => {
+    if (wrapper) {
+      wrapper.destroy();
+    }
+  });
+
+  describe('System notes', () => {
+    beforeEach(() => {
+      mountComponent({});
+    });
+
+    it('renders the correct system note', () => {
+      expect(wrapper.find('.note-wrapper').attributes('id')).toBe('note_1628');
+    });
+  });
+});

spec/frontend/alert_management/mocks/alerts.json

@@ -8,7 +8,8 @@
     "startedAt": "2020-04-17T23:18:14.996Z",
     "endedAt": "2020-04-17T23:18:14.996Z",
     "status": "TRIGGERED",
-    "assignees": { "nodes": [] }
+    "assignees": { "nodes": [] },
+    "notes": { "nodes": [] }
   },
   {
     "iid": "1527543",
@@ -18,7 +19,23 @@
     "startedAt": "2020-04-17T23:18:14.996Z",
     "endedAt": "2020-04-17T23:18:14.996Z",
     "status": "ACKNOWLEDGED",
-    "assignees": { "nodes": [{ "username": "root" }] }
+    "assignees": { "nodes": [{ "username": "root" }] },
+    "notes": {
+      "nodes": [
+        {
+          "id": "gid://gitlab/Note/1628",
+          "author": {
+            "id": "gid://gitlab/User/1",
+            "state": "active",
+            "__typename": "User",
+            "avatarUrl": "https://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80\u0026d=identicon",
+            "name": "Administrator",
+            "username": "root",
+            "webUrl": "http://192.168.1.4:3000/root"
+          }
+        }
+      ]
+    }
   },
   {
     "iid": "1527544",
@@ -28,6 +45,22 @@
     "startedAt": "2020-04-17T23:18:14.996Z",
     "endedAt": "2020-04-17T23:18:14.996Z",
     "status": "RESOLVED",
-    "assignees": { "nodes": [{ "username": "root" }] }
+    "assignees": { "nodes": [{ "username": "root" }] },
+    "notes": {
+      "nodes": [
+        {
+          "id": "gid://gitlab/Note/1629",
+          "author": {
+            "id": "gid://gitlab/User/2",
+            "state": "active",
+            "__typename": "User",
+            "avatarUrl": "https://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80\u0026d=identicon",
+            "name": "Administrator",
+            "username": "root",
+            "webUrl": "http://192.168.1.4:3000/root"
+          }
+        }
+      ]
+    }
   }
 ]

spec/graphql/types/alert_management/alert_type_spec.rb

@@ -25,6 +25,8 @@ describe GitlabSchema.types['AlertManagementAlert'] do
       created_at
       updated_at
       assignees
+      notes
+      discussions
     ]
 
     expect(described_class).to have_graphql_fields(*expected_fields)

spec/graphql/types/notes/noteable_type_spec.rb

@@ -17,6 +17,7 @@ describe Types::Notes::NoteableType do
       expect(described_class.resolve_type(build(:issue), {})).to eq(Types::IssueType)
       expect(described_class.resolve_type(build(:merge_request), {})).to eq(Types::MergeRequestType)
       expect(described_class.resolve_type(build(:design), {})).to eq(Types::DesignManagement::DesignType)
+      expect(described_class.resolve_type(build(:alert_management_alert), {})).to eq(Types::AlertManagement::AlertType)
     end
   end
 end

spec/models/alert_management/alert_spec.rb

@@ -7,6 +7,8 @@ describe AlertManagement::Alert do
     it { is_expected.to belong_to(:project) }
     it { is_expected.to belong_to(:issue) }
     it { is_expected.to have_many(:assignees).through(:alert_assignees) }
+    it { is_expected.to have_many(:notes) }
+    it { is_expected.to have_many(:user_mentions) }
   end
 
   describe 'validations' do

spec/models/alert_management/alert_user_mention_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe AlertManagement::AlertUserMention do
+  describe 'associations' do
+    it { is_expected.to belong_to(:alert_management_alert) }
+    it { is_expected.to belong_to(:note) }
+  end
+
+  it_behaves_like 'has user mentions'
+end

spec/models/note_spec.rb

@@ -829,6 +829,10 @@ describe Note do
     it 'returns commit for a commit note' do
       expect(build(:note_on_commit).noteable_ability_name).to eq('commit')
     end
+
+    it 'returns alert_management_alert for an alert note' do
+      expect(build(:note_on_alert).noteable_ability_name).to eq('alert_management_alert')
+    end
   end
 
   describe '#cache_markdown_field' do

spec/requests/api/graphql/project/alert_management/alerts_spec.rb

@@ -10,6 +10,8 @@ describe 'getting Alert Management Alerts' do
   let_it_be(:resolved_alert) { create(:alert_management_alert, :all_fields, :resolved, project: project, issue: nil, severity: :low) }
   let_it_be(:triggered_alert) { create(:alert_management_alert, :all_fields, project: project, severity: :critical, payload: payload) }
   let_it_be(:other_project_alert) { create(:alert_management_alert, :all_fields) }
+  let_it_be(:system_note) { create(:note_on_alert, noteable: triggered_alert, project: project) }
+
   let(:params) { {} }
 
   let(:fields) do
@@ -75,6 +77,8 @@ describe 'getting Alert Management Alerts' do
           'updatedAt' => triggered_alert.updated_at.strftime('%Y-%m-%dT%H:%M:%SZ')
         )
 
+        expect(first_alert['notes']['nodes'].first).to include('id' => system_note.to_global_id.to_s)
+
         expect(second_alert).to include(
           'iid' => resolved_alert.iid.to_s,
           'issueIid' => nil,

spec/services/alert_management/alerts/update_service_spec.rb

@@ -40,6 +40,7 @@ describe AlertManagement::Alerts::UpdateService do
       let(:params) { { title: nil } }
 
       it 'results in an error' do
+        expect { response }.not_to change { alert.reload.notes.count }
         expect(response).to be_error
         expect(response.message).to eq("Title can't be blank")
       end
@@ -72,6 +73,14 @@ describe AlertManagement::Alerts::UpdateService do
         expect(response).to be_success
       end
 
+      it 'creates a system note for the assignment' do
+        expect { response }.to change { alert.reload.notes.count }.by(1)
+      end
+
+      it 'adds a todo' do
+        expect { response }.to change { Todo.where(user: user_with_permissions).count }.by(1)
+      end
+
       context 'with multiple users included' do
         let(:params) { { assignees: [user_with_permissions, user_without_permissions] } }
 
@@ -80,10 +89,6 @@ describe AlertManagement::Alerts::UpdateService do
           expect(response).to be_success
         end
       end
-
-      it 'adds a todo' do
-        expect { response }.to change { Todo.where(user: user_with_permissions).count }.by(1)
-      end
     end
   end
 end