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9450ea08b4
Transport connections between nodes remain in place until one or other node shuts down or the connection is disrupted by a flaky network. Today it is very difficult to demonstrate that transient failures and cluster instability are caused by the network even though this is often the case. In particular, transport connections open and close without logging anything, even at `DEBUG` level, making it very hard to quantify the scale of the problem or to correlate the networking problems with external events. This commit adds the missing `DEBUG`-level logging when transport connections open and close, and also tracks the total number of transport connections a node has opened as a measure of the stability of the underlying network.