EXAMPLE URL-based Status Indicator Plugin

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_EXAMPLE ISSUE_
The below is a great example of an issue. It has explains (1) why it's there, (2) a proposed basic solution or solution approach, (3) desired outcome.

(1)
After talking with a few customers it would be great to have a simple plugin for registering URL-based status indicators, i.e. those that poll a URL and show "connected/disconnected" or similar based on the availability of the URL.

(2)
Basic functionality might be

var googleIndicator = new IndicatorPlugin({ 
    url: 'https://google.com', 
    icon: 'database',
    label: 'Google',
    interval: 15000
});
openmct.install(googleIndicator);

(3)
And then you'd get an indicator icon that would go red/green based on whether or not it is connected to the server.

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The actual issue I stole for this example can be found here; with a wonderful github issue structure you can browse for more examples here.