New icon: monitor-alert

[crugggiero]

Before submitting a new icon request, please confirm the following:

• I have searched all issues to make sure there isn't a request for this icon.
• I have searched the current library to make sure the icon doesn't already exist.
• I understand that brand icons are no longer being added and I can use SimpleIcons for my brand icon needs.
• I only intend to request a single icon (or a few near-identical ones) in this issue.

What would you use this icon for?

Would be used for showing host/device level alerts

Give us an example of what this icon might look like.

A new monitor alert icon, following the theme from the other alert icons

Uses the alert exclamation point from the other alert icons, shown here

Rendered inside the existing monitor icon, would replace the download arrow in this case