Excess INFO-level tracing spans created by `drive_connection`

[jbg]

drive_connection has the tracing::instrument attribute applied to it without specifying a level, so it gets the default of INFO. This method seems to be called hundreds of times per second when metrics-observer is connected, creating an excessive number of trace spans. I think a more appropriate level for this instrumentation would be TRACE.

[tobz]

Just to be clear, when you say "trace spans", are you simply saying that in the sense of spans only useful for debugging/tracing purposes? Not actually TRACE-level spans?