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entity (including a cross-claim or counterclaim in a lawsuit) alleging

Параметр `lifespan` приложения `FastAPI` принимает асинхронный менеджер контекста, поэтому мы можем передать ему наш новый асинхронный менеджер контекста `lifespan`.

{* ../../docs_src/events/tutorial003_py39.py hl[22] *}

## Альтернативные события (устаревшие) { #alternative-events-deprecated }

/// warning | Предупреждение

首先要注意的是，我们定义了一个带有 `yield` 的异步函数。这与带有 `yield` 的依赖项非常相似。

```Python hl_lines="14-19"
{!../../docs_src/events/tutorial003.py!}
```

这个函数在 `yield`之前的部分，会在应用启动前执行。

剩下的部分在 `yield` 之后，会在应用完成后执行。

## 异步上下文管理器

如你所见，这个函数有一个装饰器 `@asynccontextmanager` 。

它将函数转化为所谓的“**异步上下文管理器**”。

```Python hl_lines="1  13"
{!../../docs_src/events/tutorial003.py!}
```

在 Python 中，  **上下文管理器**是一个你可以在 `with` 语句中使用的东西，例如，`open()` 可以作为上下文管理器使用。

# How to configure Prometheus AlertManager

Alerting with prometheus is two step process. First we setup alerts in Prometheus server and then we need to send alerts to the AlertManager.

{* ../../docs_src/events/tutorial003_py39.py hl[22] *}

## Alternative Events (<abbr title="veraltet, obsolet: Es soll nicht mehr verwendet werden">deprecatet</abbr>) { #alternative-events-deprecated }

/// warning | Achtung

The `lifespan` parameter of the `FastAPI` app takes an **async context manager**, so we can pass our new `lifespan` async context manager to it.

{* ../../docs_src/events/tutorial003_py39.py hl[22] *}

## Alternative Events (deprecated) { #alternative-events-deprecated }

/// warning

    * Remove metadata agent config maps in favor of command line flags.
    * Update the metadata agent's liveness probe to a new /healthz handler.
    * Logging Agent Improvements
    * Bump logging agent version to 0.2-1.5.33-1-k8s-1.
    * Appropriately set log severity for k8s_container.
    * Fix detect exceptions plugin to analyze message field instead of log field.

![Events Diagram](../assets/images/events@2x.png)

El parámetro `lifespan` de la app de `FastAPI` toma un **async context manager**, por lo que podemos pasar nuestro nuevo `lifespan` async context manager a él.

{* ../../docs_src/events/tutorial003_py39.py hl[22] *}

## Eventos Alternativos (obsoleto) { #alternative-events-deprecated }

/// warning | Advertencia

events@2x.png...