Petals ESB Container

To have better knowledge on connection establishments at the NIO transporter level, we can add the following metrics about connections of the NIO transporter at container level:

• number of outgoing connections established from the current container to remote containers, per remote container, since the last start of the container,
• number of outgoing connections currently established from the current container to remote containers, per remote container,
• number of incoming connections established from remote containers to the current container, per remote container, since the last start of the container,
• number of incoming connections currently established from the remote containers to the current container, per remote container.