File Size
The filesize sensor is for displaying the size in MB of a file.
File paths must also be added to allowlist_external_dirs in your configuration.yaml.
File paths should be absolute paths. For example: /config/home-assistant_v2.db to monitor the size of the default database.
Configuration
To add the File Size integration to your Home Assistant instance, use this My button:
If the above My button doesn’t work, you can also perform the following steps manually:
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Browse to your Home Assistant instance.
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In the bottom right corner, select the Add Integration button.
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From the list, select File Size.
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Follow the instructions on screen to complete the setup.