Currently drupals maintenance page returns a status code in the 500 range.
This is causing issues with monitoring services which are often set up to get notified if the server is down to quickly act and resolve the issues to bring the website back online.
Returning a status code in the 500 range results in unnecessary alerts and wrong statistics in the monitoring.
Return a status code 200 for maintenance page but make it configurable in the backend in case anyone wants to keep the original status code.
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To prevent search engines from indexing the maintenance page instead of the actual site content, it's crucial that we serve it with a 503 Service Unavailable status code. This correctly signals that the site is temporarily offline and instructs crawlers to return later.