Basically, you want to monitor the ability of the LND REST API to return data. You need to set up Uptime Kuma on another machine and create a monitor to your node with some specific settings. I'm assuming the two machines involved are on the same local network.
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Install Uptime Kuma on a different Umbrel machine via the app store.
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Add a new monitor to Uptime Kuma
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add this HTTP(s) endpoint:
https://{MACHINE_HOST}:8080/v1/getinfo -
click ignore Ignore TLS/SSL error for HTTPS websites
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get the hex encoding of your read only macaroon
xxd -p -c2000 /path/to/readonly.macaroon -
In the HTTP Options under Headers add { "Grpc-Metadata-macaroon": "<hex_encoding>" }
Click save and it should test the endpoint.
Afterwards, connect Uptime Kuma to Telegram to get instant notifications about uptime :)
Feel free to ask any questions or offer suggestions to improve the setup.