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Blog post for deprecated unit system features

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Blog post for deprecated unit system features
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---
author: epenet
authorURL: https://github.com/epenet
title: "Deprecate Unit System constants and properties"
---
As of Home Assistant Core 2022.11, the `is_metric` and `name` properties of a unit system are deprecated
and should not be used.
Custom integrations referencing these properties will need to be adjusted to use instance checks instead.
Correct:
```python
if hass.config.units is IMPERIAL_SYSTEM:
pass
if hass.config.units is METRIC_SYSTEM:
pass
```
To avoid confusion with future unit systems, the constants `CONF_UNIT_SYSTEM_IMPERIAL`
and `CONF_UNIT_SYSTEM_METRIC` are also deprecated and should no longer be referenced:
- if they were used to compare against the `name` of a unit system,
then this is no longer needed.
- if they were used for another reason, then local constants should be created instead.