ДЦ
я так просто сенсор делал
- platform: command_line
name: ha_init
command: 'cat /config/home-assistant.log | grep -o "initialized[[:space:]]in[[:space:]][0-9]\+.[0-9]\+" | grep -o "[0-9]\+.[0-9]\+$" || echo -1'
scan_interval: 60
unit_of_measurement: s
