An event published when a request to check a connection out fails当签出连接的请求失败时发布的事件
The address (host/port pair) of the pool池的地址（主机/端口对）
The reason the attempt to check out failed尝试签出失败的原因
A timestamp when the event was created创建事件时的时间戳
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An event published when a request to check a connection out fails当签出连接的请求失败时发布的事件