Jack Fischer

There are numerous plugins for emailing or otherwise notifying administrators when users log into WordPress. However, this is not desirable for installations with hundreds or thousands of users. Admin Login Monitor provides more managable email alerts, just for administrator accounts.
Example alert email,
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</code></pre>
Hello Alice,
The account ‘bob’ just logged into example.com
User Login ‘bob’ 
User Display Name ‘Bob’ 
User Email bob@example.com 
User ID ‘8’ 
User Registered 2019-08-25 19:33:18
Forwarded IP Address 96.224.58.71 (HTTP_X_FORWARDED_FOR) 
Connected IP Address 96.224.58.71 (possibly a CDN or proxy)
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.5 Safari/605.1.15
This notification is generated by the WordPress Admin Login Monitor plugin installed on example.com 
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For convenience investigating IP addresses, email notifications link to Ipinfo.io (https://ipinfo.io/). 
Ipinfo.io Terms of Service: https://ipinfo.io/terms-of-service 
Ipinfo.io Privacy Policy: https://ipinfo.io/privacy-policy

Admin Login Monitor

Email site administrators about all administrator logins.

Nikki Blight

The Scheduled Announcements Widget lets you add a scrolling list of site announcements, independent of normal posts and pages, to any widgetized 
area of your site, or to your theme files. Perfect for publicizing an event, alert, or notice that doesn’t require a full-page write-up. Announcements 
can be scheduled to run indefinitely or during a specific date range, and admins can chose between horizontal or vertical scrolling.
<h3>Additional Details</h3>
This plugin makes use of the JSColor library. The JSColor project is maintained by Jan Odv�rko and released under the GNU Lesser General Public 
License. See http://jscolor.com for more information.

Scheduled Announcements Widget

The Scheduled Announcements Widget lets you add a scrolling list of site announcements to any widgetized area of your site.

Admin Login Monitor vs Scheduled Announcements Widget