Optional
disconnectWhen the connection was closed, if it has been closed.
When the socket initially connected, in MS since the unix epoch.
Optional
tunnelWhen the outer tunnel (e.g. a preceeding CONNECT request/SOCKS connection) was created, if there was one.
When the socket initially connected, equivalent to startTime.
High-precision floating-point monotonically increasing timestamps. Comparable and precise, but not related to specific current time.