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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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.

Sérgio Santos

<a href="https://www.statuscake.com" rel="nofollow ugc">StatusCake</a> is a website uptime monitoring and alerts service. StatusCake is an ideal companion to your WordPress website that features rich uptime monitoring, domain monitoring, SSL monitoring and a whole lot more.
This plugin allows you to easily integrate StatusCake into your WordPress website.
<h4>Usage</h4>
Navigate to the ‘StatusCake’ settings page under the Settings menu.

StatusCake

Easy integration of StatusCake into your WordPress website.

Admin Login Monitor vs StatusCake