Add blog post on config validation and error handling

blog/2023-11-27-config-validation-and-error-handling.md

@@ -0,0 +1,40 @@
+---
+author: Jan Bouwhuis
+authorURL: https://github.com/jbouwh
+authorImageURL: https://avatars.githubusercontent.com/u/7188918?s=96&v=4
+title: Config processing and error handling
+---
+
+## Changes in component config processing and error handling
+
+The way component YAML configuration is processed has been changed. Now, it is possible to raise if an error occurs. Some custom integrations might break if they are using `config.async_process_component_config`.
+Instead, they can use `config.async_process_component_and_handle_errors` now. This new method supports raising when an error occurs during config processing.
+From now on, failures will no longer be notified as a persistent message, so integrations need to implement error handling to notify users in case of a failure. Notifications are still added during setup in case of a config issue.
+
+```python
+async def async_process_component_and_handle_errors(
+    hass: HomeAssistant,
+    config: ConfigType,
+    integration: Integration,
+    raise_on_failure: bool = False,
+) -> ConfigType | None:
+...
+```
+
+During a reload integrations can use the  `helpers.reload.async_integration_yaml_config`. This helper now also has the ability to raise in case of a failure.
+
+```python
+async def async_integration_yaml_config(
+    hass: HomeAssistant, integration_name: str, *, raise_on_failure: bool = False
+) -> ConfigType | None:
+...
+```
+
+## Translation support for Exceptions on config validation
+
+A new `ConfigValidationError` exception class is introduced. It will be raised in case an error occurs during config error handling and `raise_on_failure` is set to `True`. It can be re-raised to a `ServiceValidationError` in case this error is raised during the execution of a service call and a stack trace is not warranted. Translation keys are added to allow localization of the error messages.
+
+### Background
+
+- Background [discussion](https://github.com/home-assistant/architecture/discussions/992).
+- Implementation [Core PR #102410](https://github.com/home-assistant/core/pull/102410).