Reviewer roulette via Danger

What does this MR do?

(Tries to) add reviewer roulette via Danger. The idea is that danger can scan the MR and determine what reviews it needs. Once decided, it can randomly pick a reviewer and maintainer for each category, perhaps taking OOO status into account along with any other information. It could even take CODEOWNERS information into account.

The final choice of which reviewers to use should remain with the author of the merge request - these are just suggestions to ease selection when the author doesn't have a strong opinion.

I'm new to danger - let's see what I can do!

What are the relevant issue numbers?

Closes #56087 (closed)

Does this MR meet the acceptance criteria?

• [-] Changelog entry added, if necessary
• Documentation created/updated via this MR
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the style guides
• Security reports checked/validated by reviewer

app/assets/javascripts/clusters/components/application_row.vue

 <script>
 /* eslint-disable vue/require-default-prop */
+import { GlLink } from '@gitlab/ui';
+import TimeagoTooltip from '../../vue_shared/components/time_ago_tooltip.vue';
 import { s__, sprintf } from '../../locale';
 import eventHub from '../event_hub';
 import identicon from '../../vue_shared/components/identicon.vue';
 import loadingButton from '../../vue_shared/components/loading_button.vue';
-import { APPLICATION_STATUS, REQUEST_SUBMITTED, REQUEST_FAILURE } from '../constants';
+import {
+  APPLICATION_STATUS,
+  REQUEST_SUBMITTED,
+  REQUEST_FAILURE,
+  UPGRADE_REQUESTED,
+} from '../constants';
 
 export default {
   components: {
     loadingButton,
     identicon,
+    TimeagoTooltip,
+    GlLink,
   },
   props: {
     id: {
@@ -54,6 +63,18 @@ export default {
       type: String,
       required: false,
     },
+    version: {
+      type: String,
+      required: false,
+    },
+    chartRepo: {
+      type: String,
+      required: false,
+    },
+    upgradeAvailable: {
+      type: Boolean,
+      required: false,
+    },
     installApplicationRequestParams: {
       type: Object,
       required: false,
@@ -78,7 +99,8 @@ export default {
       return (
         this.status === APPLICATION_STATUS.INSTALLED ||
         this.status === APPLICATION_STATUS.UPDATED ||
-        this.status === APPLICATION_STATUS.UPDATING
+        this.status === APPLICATION_STATUS.UPDATING ||
+        this.status === APPLICATION_STATUS.UPDATE_ERRORED
       );
     },
     canInstall() {
@@ -146,6 +168,69 @@ export default {
         title: this.title,
       });
     },
+    versionLabel() {
+      if (this.upgradeFailed) {
+        return s__('ClusterIntegration|Upgrade failed');
+      } else if (this.isUpgrading) {
+        return s__('ClusterIntegration|Upgrading');
+      }
+
+      return s__('ClusterIntegration|Upgraded');
+    },
+    upgradeRequested() {
+      return this.requestStatus === UPGRADE_REQUESTED;
+    },
+    upgradeSuccessful() {
+      return this.status === APPLICATION_STATUS.UPDATED;
+    },
+    upgradeFailed() {
+      if (this.isUpgrading) {
+        return false;
+      }
+
+      return this.status === APPLICATION_STATUS.UPDATE_ERRORED;
+    },
+    upgradeFailureDescription() {
+      return sprintf(
+        s__(
+          'ClusterIntegration|Something went wrong when upgrading %{title}. Please check the logs and try again.',
+        ),
+        {
+          title: this.title,
+        },
+      );
+    },
+    upgradeSuccessDescription() {
+      return sprintf(s__('ClusterIntegration|%{title} upgraded successfully.'), {
+        title: this.title,
+      });
+    },
+    upgradeButtonLabel() {
+      let label;
+      if (this.upgradeAvailable && !this.upgradeFailed && !this.isUpgrading) {
+        label = s__('ClusterIntegration|Upgrade');
+      } else if (this.isUpgrading) {
+        label = s__('ClusterIntegration|Upgrading');
+      } else if (this.upgradeFailed) {
+        label = s__('ClusterIntegration|Retry upgrade');
+      }
+
+      return label;
+    },
+    isUpgrading() {
+      // Since upgrading is handled asynchronously on the backend we need this check to prevent any delay on the frontend
+      return (
+        this.status === APPLICATION_STATUS.UPDATING ||
+        (this.upgradeRequested && !this.upgradeSuccessful)
+      );
+    },
+  },
+  watch: {
+    status() {
+      if (this.status === APPLICATION_STATUS.UPDATE_ERRORED) {
+        eventHub.$emit('upgradeFailed', this.id);
+      }
+    },
   },
   methods: {
     installClicked() {
@@ -154,6 +239,15 @@ export default {
         params: this.installApplicationRequestParams,
       });
     },
+    upgradeClicked() {
+      eventHub.$emit('upgradeApplication', {
+        id: this.id,
+        params: this.installApplicationRequestParams,
+      });
+    },
+    dismissUpgradeSuccess() {
+      eventHub.$emit('dismissUpgradeSuccess', this.id);
+    },
   },
 };
 </script>
@@ -207,6 +301,51 @@ export default {
             </li>
           </ul>
         </div>
+
+        <div
+          v-if="(upgradeSuccessful || upgradeFailed) && !upgradeAvailable"
+          class="form-text text-muted label p-0 js-cluster-application-upgrade-details"
+        >
+          {{ versionLabel }}
+
+          <span v-if="upgradeSuccessful"> to</span>
+
+          <gl-link
+            v-if="upgradeSuccessful"
+            :href="chartRepo"
+            target="_blank"
+            class="js-cluster-application-upgrade-version"
+          >
+            chart v{{ version }}
+          </gl-link>
+        </div>
+
+        <div
+          v-if="upgradeFailed && !isUpgrading"
+          class="bs-callout bs-callout-danger cluster-application-banner mt-2 mb-0 js-cluster-application-upgrade-failure-message"
+        >
+          {{ upgradeFailureDescription }}
+        </div>
+
+        <div
+          v-if="upgradeRequested && upgradeSuccessful"
+          class="bs-callout bs-callout-success cluster-application-banner mt-2 mb-0 p-0 pl-3"
+        >
+          {{ upgradeSuccessDescription }}
+
+          <button class="close cluster-application-banner-close" @click="dismissUpgradeSuccess">
+            &times;
+          </button>
+        </div>
+
+        <loading-button
+          v-if="upgradeAvailable || upgradeFailed || isUpgrading"
+          class="btn btn-primary js-cluster-application-upgrade-button mt-2"
+          :loading="isUpgrading"
+          :disabled="isUpgrading"
+          :label="upgradeButtonLabel"
+          @click="upgradeClicked"
+        />
       </div>
       <div
         :class="{ 'section-25': showManageButton, 'section-15': !showManageButton }"