An event published when a connection is checked into the connection pool将连接签入连接池时发布的事件
The address (host/port pair) of the pool池的地址（主机/端口对）
The id of the connection连接的id
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 connection is checked into the connection pool将连接签入连接池时发布的事件