* Add support for a maintenance boolean in API results.
If a device is under maintenance, it would be nice to see that from the
API. This can help drive other automation workflows where LibreNMS forms
a cornerstone in the management source of truth.
* Revert changes made by VSCode formatting.
* Revert two more formatting changes.
* Create a new API endpoint for GETing maintenance status.
This uses the same endpoint name as for setting a device to maintenance
but with a GET verb.
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Co-authored-by: Joe Clarke <jclarke@cisco.com>
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