backstage/.changeset/eight-doors-matter.md

@backstage/core-api, @backstage/plugin-catalog

@backstage/core-api	@backstage/plugin-catalog
patch	patch

Minor refactoring of BackstageApp.getSystemIcons to support custom registered icons. Custom Icons can be added using:

import AlarmIcon from '@material-ui/icons/Alarm';
import MyPersonIcon from './MyPerson';

const app = createApp({
  icons: {
    user: MyPersonIcon // override system icon
    alert: AlarmIcon, // Custom icon
  },
});