How do i automatically renew lets encrypt certificate automatically?

without the < and > :wink:
But I’m quite sure the sensor name would start with cert_expiry_timestamp_ as that would be the default name given by the integration :thinking:

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FYI, the integration apparently now names the sensor as:

sensor.homeassistant_mydomain_tld_8123_cert_expiry

ETA: a clearer explanation:
sensor.<fqdn (dots replaced with underscores)>_<port>_cert_expiry