You have been asked to post a notice or message alerting everyone for a maintenance or Salesforce outage as a Salesforce administrator.

You can simply put the Rich Text component on the lightning home page and display the messages as well as the link on that.

If you want the message to appear before users reach the home page after logging in. Check out this article.

Goto Home page and click on gear icon.

Click on Edit Page

Drag the Rich Text component on the page and put the message that you want to display.

Now, when users log in, a message appears on the home page.

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