Fixes some Ember Deprecations for 1.13:

- Remove ArrayController
- Remove {{view}} from templates
- Replace many cases of needs: [‘controller’] with inject
- Enable Ember Legacy Views

app/assets/javascripts/admin/components/admin-backups-logs.js.es6

@@ -0,0 +1,56 @@
+import debounce from 'discourse/lib/debounce';
+import { renderSpinner } from 'discourse/helpers/loading-spinner';
+import { escapeExpression } from 'discourse/lib/utilities';
+
+export default Ember.Component.extend({
+  classNames: ["admin-backups-logs"],
+
+  init() {
+    this._super();
+    this._reset();
+  },
+
+  _reset() {
+    this.setProperties({ formattedLogs: "", index: 0 });
+  },
+
+  _updateFormattedLogs: debounce(function() {
+    const logs = this.get("logs");
+    if (logs.length === 0) {
+      this._reset(); // reset the cached logs whenever the model is reset
+    } else {
+      // do the log formatting only once for HELLish performance
+      let formattedLogs = this.get("formattedLogs");
+      for (let i = this.get("index"), length = logs.length; i < length; i++) {
+        const date = logs[i].get("timestamp"),
+              message = escapeExpression(logs[i].get("message"));
+        formattedLogs += "[" + date + "] " + message + "\n";
+      }
+      // update the formatted logs & cache index
+      this.setProperties({ formattedLogs: formattedLogs, index: logs.length });
+      // force rerender
+      this.rerender();
+    }
+  }, 150).observes("logs.[]").on('init'),
+
+  render(buffer) {
+    const formattedLogs = this.get("formattedLogs");
+    if (formattedLogs && formattedLogs.length > 0) {
+      buffer.push("<pre>");
+      buffer.push(formattedLogs);
+      buffer.push("</pre>");
+    } else {
+      buffer.push("<p>" + I18n.t("admin.backups.logs.none") + "</p>");
+    }
+    // add a loading indicator
+    if (this.get("status.isOperationRunning")) {
+      buffer.push(renderSpinner('small'));
+    }
+  },
+
+  didInsertElement() {
+    this._super();
+    const $div = this.$()[0];
+    $div.scrollTop = $div.scrollHeight;
+  },
+});