diff --git a/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.ts b/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.ts
index d6f4bdd..41a7598 100644
--- a/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.ts
@@ -252,7 +252,7 @@
       })
       .catch(err => {
         fireTitleChange(this, title || this._computeTitle(user));
-        console.warn(err);
+        this.reporting.error(err);
       })
       .then(() => {
         this._loading = false;
diff --git a/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header_html.ts b/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header_html.ts
index 1924a66..42a6847 100644
--- a/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header_html.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header_html.ts
@@ -29,7 +29,7 @@
   </style>
   <gr-avatar
     account="[[_accountDetails]]"
-    image-size="100"
+    imageSize="100"
     aria-label="Account avatar"
   ></gr-avatar>
   <div class="info">
diff --git a/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts b/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts
index bd9103e..c34a6ae 100644
--- a/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts
@@ -327,10 +327,9 @@
           margin-bottom: var(--spacing-m);
         }
         .zeroState {
-          color: var(--primary-text-color);
+          color: var(--deemphasized-text-color);
         }
         .loading.zeroState {
-          color: var(--deemphasized-text-color);
           margin-right: var(--spacing-m);
         }
         div.error {
@@ -561,7 +560,7 @@
                   account =>
                     html`<gr-avatar
                       .account="${account}"
-                      image-size="32"
+                      imageSize="32"
                     ></gr-avatar>`
                 )}
                 ${countUnresolvedComments} unresolved</gr-summary-chip
diff --git a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts
index 3542ead..58cf489 100644
--- a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts
@@ -634,7 +634,7 @@
           this._dynamicTabContentEndpoints.length !==
           this._dynamicTabHeaderEndpoints.length
         ) {
-          console.warn('Different number of tab headers and tab content.');
+          this.reporting.error(new Error('Mismatch of headers and content.'));
         }
       })
       .then(() => this._initActiveTabs(this.params));
@@ -767,7 +767,7 @@
       }
     }
     if (activeIndex === -1) {
-      console.warn('tab not found with given info', activeDetails);
+      this.reporting.error(new Error(`tab not found for ${activeDetails}`));
       return;
     }
     const tabName = tabs[activeIndex].dataset['name'];
diff --git a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.ts b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.ts
index 532097b..ff303e3 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.ts
+++ b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.ts
@@ -44,6 +44,7 @@
 import {DiffViewMode} from '../../../constants/constants';
 import {GrButton} from '../../shared/gr-button/gr-button';
 import {fireEvent} from '../../../utils/event-util';
+import {KeyboardShortcutMixin} from '../../../mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -60,7 +61,7 @@
 }
 
 @customElement('gr-file-list-header')
-export class GrFileListHeader extends PolymerElement {
+export class GrFileListHeader extends KeyboardShortcutMixin(PolymerElement) {
   static get template() {
     return htmlTemplate;
   }
diff --git a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.ts b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.ts
index 69be729..8b9b80c 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.ts
@@ -173,6 +173,7 @@
           class="download"
           title="[[createTitle(Shortcut.OPEN_DOWNLOAD_DIALOG,
                 ShortcutSection.ACTIONS)]]"
+          has-tooltip=""
           on-click="_handleDownloadTap"
           >Download</gr-button
         >
@@ -186,6 +187,7 @@
           link=""
           title="[[createTitle(Shortcut.TOGGLE_ALL_INLINE_DIFFS,
                 ShortcutSection.FILE_LIST)]]"
+          has-tooltip=""
           on-click="_expandAllDiffs"
           >Expand All</gr-button
         >
@@ -195,6 +197,7 @@
           on-click="_collapseAllDiffs"
           title="[[createTitle(Shortcut.TOGGLE_ALL_INLINE_DIFFS,
           ShortcutSection.FILE_LIST)]]"
+          has-tooltip=""
           >Collapse All</gr-button
         >
       </template>
diff --git a/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.ts b/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.ts
index f61e024..5ce6e3b 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.ts
+++ b/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.ts
@@ -385,25 +385,19 @@
           this._dynamicHeaderEndpoints.length !==
           this._dynamicContentEndpoints.length
         ) {
-          console.warn(
-            'Different number of dynamic file-list header and content.'
-          );
+          this.reporting.error(new Error('dynamic header/content mismatch'));
         }
         if (
           this._dynamicPrependedHeaderEndpoints.length !==
           this._dynamicPrependedContentEndpoints.length
         ) {
-          console.warn(
-            'Different number of dynamic file-list header and content.'
-          );
+          this.reporting.error(new Error('dynamic header/content mismatch'));
         }
         if (
           this._dynamicHeaderEndpoints.length !==
           this._dynamicSummaryEndpoints.length
         ) {
-          console.warn(
-            'Different number of dynamic file-list headers and summary.'
-          );
+          this.reporting.error(new Error('dynamic header/content mismatch'));
         }
       });
   }
@@ -1429,7 +1423,9 @@
         console.info('Expanding diff', iter, 'of', initialCount, ':', path);
         const diffElem = this._findDiffByPath(path, diffElements);
         if (!diffElem) {
-          console.warn(`Did not find <gr-diff-host> element for ${path}`);
+          this.reporting.error(
+            new Error(`Did not find <gr-diff-host> element for ${path}`)
+          );
           return Promise.resolve();
         }
         if (!this.changeComments || !this.patchRange || !this.diffPrefs) {
diff --git a/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.ts b/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.ts
index 6be0c07..4e2aaf1 100644
--- a/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.ts
+++ b/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.ts
@@ -270,7 +270,9 @@
       | undefined;
 
     if (!el && this._showAllActivity) {
-      console.warn(`Failed to scroll to message: ${messageID}`);
+      this.reporting.error(
+        new Error(`Failed to scroll to message: ${messageID}`)
+      );
       return;
     }
     if (!el) {
diff --git a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.ts b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.ts
index d3d6010..939b23c 100644
--- a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.ts
+++ b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.ts
@@ -758,7 +758,7 @@
     if (changeReviewers) {
       for (const key of Object.keys(changeReviewers)) {
         if (key !== 'REVIEWER' && key !== 'CC') {
-          console.warn('unexpected reviewer state:', key);
+          this.reporting.error(new Error(`Unexpected reviewer state: ${key}`));
           continue;
         }
         if (!changeReviewers[key]) continue;
@@ -1085,9 +1085,8 @@
       } else if (isReviewerGroupSuggestion(suggestion)) {
         entry = suggestion.group;
       } else {
-        console.warn(
-          'received suggestion that was neither account nor group:',
-          suggestion
+        this.reporting.error(
+          new Error(`Suggestion is neither account nor group: ${suggestion}`)
         );
         return false;
       }
diff --git a/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list.ts b/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list.ts
index 2f4adf5..8283be79 100644
--- a/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list.ts
+++ b/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list.ts
@@ -112,7 +112,7 @@
   }
 
   _computeEmptyThreadsMessage(threads: CommentThread[]) {
-    return !threads.length ? 'No comments.' : 'No unresolved comments';
+    return !threads.length ? 'No comments' : 'No unresolved comments';
   }
 
   _showPartyPopper(threads: CommentThread[]) {
diff --git a/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_test.js b/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_test.js
index 1fe00ff..3d6cfd4 100644
--- a/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_test.js
+++ b/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_test.js
@@ -611,7 +611,7 @@
     test('default empty message should show', () => {
       assert.isTrue(
           element.shadowRoot.querySelector('#threads').textContent.trim()
-              .includes('No comments.'));
+              .includes('No comments'));
     });
   });
 });
diff --git a/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown_html.ts b/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown_html.ts
index 0fa2f1e..97f4a89 100644
--- a/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown_html.ts
+++ b/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown_html.ts
@@ -45,7 +45,7 @@
       account="[[account]]"
       hidden$="[[!_hasAvatars]]"
       hidden=""
-      image-size="56"
+      imageSize="56"
       aria-label="Account avatar"
     ></gr-avatar>
   </gr-dropdown>
diff --git a/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager.ts b/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager.ts
index 351e1bb..8f9dfe2 100644
--- a/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager.ts
+++ b/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager.ts
@@ -231,7 +231,7 @@
           );
         }
       }
-      console.info(`server error: ${errorText}`);
+      this.reporting.error(new Error(`Server error: ${errorText}`));
     });
   };
 
@@ -319,7 +319,7 @@
 
   private readonly handleNetworkError = (e: NetworkErrorEvent) => {
     this._showAlert('Server unavailable');
-    console.error(e.detail.error.message);
+    this.reporting.error(new Error(`network error: ${e.detail.error.message}`));
   };
 
   // TODO(dhruvsr): allow less priority alerts to override high priority alerts
diff --git a/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager_test.js b/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager_test.js
index 91f119e..fe4d9da 100644
--- a/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager_test.js
+++ b/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager_test.js
@@ -207,7 +207,6 @@
     });
 
     test('show network error', done => {
-      const consoleErrorStub = sinon.stub(console, 'error');
       const showAlertStub = sinon.stub(element, '_showAlert');
       element.dispatchEvent(
           new CustomEvent('network-error', {
@@ -218,8 +217,6 @@
         assert.isTrue(showAlertStub.calledOnce);
         assert.isTrue(showAlertStub.lastCall.calledWithExactly(
             'Server unavailable'));
-        assert.isTrue(consoleErrorStub.calledOnce);
-        assert.isTrue(consoleErrorStub.lastCall.calledWithExactly('ZOMG'));
         done();
       });
     });
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.ts b/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.ts
index b42deda..72c7a62 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.ts
@@ -398,7 +398,7 @@
       if (e instanceof Response) {
         this._handleGetDiffError(e);
       } else {
-        console.warn('Error encountered loading diff:', e);
+        this.reporting.error(e);
       }
     } finally {
       this.reporting.timeEnd(Timing.DIFF_TOTAL);
@@ -483,12 +483,12 @@
               });
             })
             .catch(err => {
-              console.warn('Applying coverage from provider failed: ', err);
+              this.reporting.error(err);
             });
         });
       })
       .catch(err => {
-        console.warn('Loading coverage ranges failed: ', err);
+        this.reporting.error(err);
       });
   }
 
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.ts b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.ts
index 2285afc..dacd8e7 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.ts
@@ -1099,7 +1099,9 @@
     // the top-level change info view) and therefore undefined in `params`.
     // If route is of type /comment/<commentId>/ then no patchNum is present
     if (!value.patchNum && !value.commentLink) {
-      console.warn('invalid url, no patchNum found');
+      this.reporting.error(
+        new Error(`Invalid diff view URL, no patchNum found: ${value}`)
+      );
       return;
     }
 
diff --git a/polygerrit-ui/app/elements/plugins/gr-event-helper/gr-event-helper.ts b/polygerrit-ui/app/elements/plugins/gr-event-helper/gr-event-helper.ts
index 0c6dd4d..0c36cd5 100644
--- a/polygerrit-ui/app/elements/plugins/gr-event-helper/gr-event-helper.ts
+++ b/polygerrit-ui/app/elements/plugins/gr-event-helper/gr-event-helper.ts
@@ -57,7 +57,7 @@
         try {
           mayContinue = callback(e);
         } catch (exception) {
-          console.warn(`Plugin error handing event: ${exception}`);
+          this.reporting.error(exception);
         }
         if (mayContinue === false) {
           e.stopImmediatePropagation();
diff --git a/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info_html.ts b/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info_html.ts
index 6ca484d..e530ac8 100644
--- a/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info_html.ts
+++ b/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info_html.ts
@@ -35,7 +35,7 @@
     <section>
       <span class="title"></span>
       <span class="value">
-        <gr-avatar account="[[_account]]" image-size="120"></gr-avatar>
+        <gr-avatar account="[[_account]]" imageSize="120"></gr-avatar>
       </span>
     </section>
     <section class$="[[_hideAvatarChangeUrl(_avatarChangeUrl)]]">
diff --git a/polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label_html.ts b/polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label_html.ts
index be590b1..a642337 100644
--- a/polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label_html.ts
@@ -128,7 +128,7 @@
     class$="[[_computeHasAttentionClass(highlightAttention, account, change, forceAttention)]]"
   >
     <template is="dom-if" if="[[!hideAvatar]]">
-      <gr-avatar account="[[account]]" image-size="32"></gr-avatar>
+      <gr-avatar account="[[account]]" imageSize="32"></gr-avatar>
     </template>
     <span class="text">
       <span class="name">[[_computeName(account, _config, firstName)]]</span>
diff --git a/polygerrit-ui/app/elements/shared/gr-account-list/gr-account-list.ts b/polygerrit-ui/app/elements/shared/gr-account-list/gr-account-list.ts
index 231fc36..130969e 100644
--- a/polygerrit-ui/app/elements/shared/gr-account-list/gr-account-list.ts
+++ b/polygerrit-ui/app/elements/shared/gr-account-list/gr-account-list.ts
@@ -326,7 +326,9 @@
         return;
       }
     }
-    console.warn('received remove event for missing account', toRemove);
+    this.reporting.error(
+      new Error(`Received "remove" event for missing account: ${toRemove}`)
+    );
   }
 
   _getNativeInput(paperInput: PaperInputElementExt) {
diff --git a/polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar.ts b/polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar.ts
index e30e995..80576a7 100644
--- a/polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar.ts
+++ b/polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar.ts
@@ -14,22 +14,16 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import '../../../styles/shared-styles';
-import {PolymerElement} from '@polymer/polymer/polymer-element';
-import {htmlTemplate} from './gr-avatar_html';
 import {getBaseUrl} from '../../../utils/url-util';
 import {getPluginLoader} from '../gr-js-api-interface/gr-plugin-loader';
-import {customElement, property} from '@polymer/decorators';
 import {AccountInfo} from '../../../types/common';
 import {appContext} from '../../../services/app-context';
+import {GrLitElement} from '../../lit/gr-lit-element';
+import {css, customElement, html, property} from 'lit-element';
 
 @customElement('gr-avatar')
-export class GrAvatar extends PolymerElement {
-  static get template() {
-    return htmlTemplate;
-  }
-
-  @property({type: Object, observer: '_accountChanged'})
+export class GrAvatar extends GrLitElement {
+  @property({type: Object})
   account?: AccountInfo;
 
   @property({type: Number})
@@ -40,6 +34,27 @@
 
   private readonly restApiService = appContext.restApiService;
 
+  static get styles() {
+    return [
+      css`
+        :host {
+          display: inline-block;
+          border-radius: 50%;
+          background-size: cover;
+          background-color: var(
+            --avatar-background-color,
+            var(--gray-background)
+          );
+        }
+      `,
+    ];
+  }
+
+  render() {
+    this._updateAvatarURL();
+    return html``;
+  }
+
   /** @override */
   connectedCallback() {
     super.connectedCallback();
@@ -57,10 +72,6 @@
     return this.restApiService.getConfig();
   }
 
-  _accountChanged() {
-    this._updateAvatarURL();
-  }
-
   _updateAvatarURL() {
     if (!this._hasAvatars || !this.account) {
       this.hidden = true;
@@ -80,7 +91,7 @@
     );
   }
 
-  _buildAvatarURL(account: AccountInfo) {
+  _buildAvatarURL(account?: AccountInfo) {
     if (!account) {
       return '';
     }
diff --git a/polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar_html.ts b/polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar_html.ts
deleted file mode 100644
index a1e51df..0000000
--- a/polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar_html.ts
+++ /dev/null
@@ -1,28 +0,0 @@
-/**
- * @license
- * Copyright (C) 2020 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-import {html} from '@polymer/polymer/lib/utils/html-tag';
-
-export const htmlTemplate = html`
-  <style>
-    :host {
-      display: inline-block;
-      border-radius: 50%;
-      background-size: cover;
-      background-color: var(--avatar-background-color, var(--gray-background));
-    }
-  </style>
-`;
diff --git a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread.ts b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread.ts
index b4b4c19..d6ad030 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread.ts
+++ b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread.ts
@@ -706,7 +706,9 @@
     const index = this._indexOf(comment, this.comments);
     if (index === -1) {
       // This should never happen: comment belongs to another thread.
-      console.warn('Comment update for another comment thread.');
+      this.reporting.error(
+        new Error(`Comment update for another comment thread: ${comment}`)
+      );
       return;
     }
     this.set(['comments', index], comment);
diff --git a/polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text.ts b/polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text.ts
index 17b659f..7298af7 100644
--- a/polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text.ts
+++ b/polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text.ts
@@ -20,6 +20,7 @@
 import {customElement, property} from '@polymer/decorators';
 import {htmlTemplate} from './gr-formatted-text_html';
 import {CommentLinks} from '../../../types/common';
+import {appContext} from '../../../services/app-context';
 
 const CODE_MARKER_PATTERN = /^(`{1,3})([^`]+?)\1$/;
 
@@ -57,6 +58,8 @@
   @property({type: Boolean})
   noTrailingMargin = false;
 
+  private readonly reporting = appContext.reportingService;
+
   static get observers() {
     return ['_contentOrConfigChanged(content, config)'];
   }
@@ -304,7 +307,7 @@
         return ul;
       }
 
-      console.warn('Unrecognized type.');
+      this.reporting.error(new Error(`Unrecognized block type: ${block.type}`));
       return document.createElement('span');
     });
   }
diff --git a/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_html.ts b/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_html.ts
index d0986de..dac5962 100644
--- a/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_html.ts
@@ -75,7 +75,7 @@
     <template is="dom-if" if="[[_isShowing]]">
       <div class="top">
         <div class="avatar">
-          <gr-avatar account="[[account]]" image-size="56"></gr-avatar>
+          <gr-avatar account="[[account]]" imageSize="56"></gr-avatar>
         </div>
         <div class="account">
           <h3 class="name heading-3">[[account.name]]</h3>
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-js-api.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-js-api.ts
index 3f75970..82c7118 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-js-api.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-annotation-actions-js-api.ts
@@ -42,7 +42,9 @@
   ): GrAnnotationActionsInterface {
     this.reporting.trackApi(this.plugin, 'annotation', 'setCoverageProvider');
     if (this.coverageProvider) {
-      console.warn('Overwriting an existing coverage provider.');
+      this.reporting.error(
+        new Error(`Overwriting cov provider: ${this.plugin.getPluginName()}`)
+      );
     }
     this.coverageProvider = coverageProvider;
     return this;
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-change-actions-js-api.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-change-actions-js-api.ts
index 15d4680..b9c4c32 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-change-actions-js-api.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-change-actions-js-api.ts
@@ -80,7 +80,7 @@
    */
   private setEl(el?: GrChangeActionsElement) {
     if (!el) {
-      console.warn('changeActions() is not ready');
+      this.reporting.error(new Error(`changeActions() API is not ready`));
       return;
     }
     this.el = el;
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-action-context.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-action-context.ts
index 2135c30..46c7ad6 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-action-context.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-action-context.ts
@@ -22,6 +22,7 @@
 import {windowLocationReload} from '../../../utils/dom-util';
 import {PopupPluginApi} from '../../../api/popup';
 import {GrPopupInterface} from '../../plugins/gr-popup-interface/gr-popup-interface';
+import {appContext} from '../../../services/app-context';
 
 interface ButtonCallBacks {
   onclick: (event: Event) => boolean;
@@ -30,6 +31,8 @@
 export class GrPluginActionContext {
   private popups: PopupPluginApi[] = [];
 
+  private readonly reporting = appContext.reportingService;
+
   constructor(
     public readonly plugin: PluginApi,
     public readonly action: UIActionInfo,
@@ -108,7 +111,9 @@
   call(payload: RequestPayload, onSuccess: (result: unknown) => void) {
     if (!this.action.method) return;
     if (!this.action.__url) {
-      console.warn(`Unable to ${this.action.method} to ${this.action.__key}!`);
+      this.reporting.error(
+        new Error(`Unable to ${this.action.method} to ${this.action.__key}!`)
+      );
       return;
     }
     this.plugin
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-loader.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-loader.ts
index fe101c5..6fc8f1b 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-loader.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-plugin-loader.ts
@@ -132,7 +132,7 @@
       try {
         url = new URL(url);
       } catch (e) {
-        console.warn(e);
+        this._getReporting().error(e);
         return false;
       }
     }
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-public-js-api.ts b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-public-js-api.ts
index 35acdef..cfa6c04 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-public-js-api.ts
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-public-js-api.ts
@@ -79,9 +79,10 @@
     this.domHooks = new GrDomHooksManager(this);
 
     if (!url) {
-      console.warn(
-        'Plugin not being loaded from /plugins base path.',
-        'Unable to determine name.'
+      this.report.error(
+        new Error(
+          `Plugin not being loaded from /plugins base path. Unable to determine name.`
+        )
       );
       return this;
     }
diff --git a/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info.ts b/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info.ts
index db22ce5..31a709a 100644
--- a/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info.ts
+++ b/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info.ts
@@ -81,6 +81,8 @@
 
   private readonly restApiService = appContext.restApiService;
 
+  private readonly reporting = appContext.reportingService;
+
   // TODO(TS): not used, remove later
   _xhrPromise?: Promise<void>;
 
@@ -209,7 +211,7 @@
         }
       })
       .catch(err => {
-        console.warn(err);
+        this.reporting.error(err);
         target.disabled = false;
         return;
       });
diff --git a/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_html.ts b/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_html.ts
index 56ab8c6..b6583d9 100644
--- a/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_html.ts
@@ -88,7 +88,7 @@
   <p
     class$="placeholder [[_computeShowPlaceholder(labelInfo, change.labels.*)]]"
   >
-    No votes.
+    No votes
   </p>
   <table>
     <template