Is it safe to expose the Homeassistant Observer (port 4357) to the internet?

I want to use an external service to monitor the uptime of my HASS, but I don’t want to expose my entire HASS to the internet to do so. I found that there’s an observer on port 4357, but it seems that it can output logs when there’s a problem that I’m worried could contain compromising information.

Is it safe to expose this port to the internet? Any safer than just exposing my whole frontend?

NO.

See this thread for a possible solution: To configure monitor for Home Assistant without ping from outside.

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