add support for emitting span events #17
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When emitted, the span events look like this (for an imaginary function
called `print`, taking two arguments):
ts=2025-08-29T13:29:27.488649565Z level=info target=_rsplayground span=print span_path=print message=new
ts=2025-08-29T13:29:27.488658128Z level=info target=_rsplayground span=print span_path=print message=enter arg1="hello" arg2="world"
ts=2025-08-29T13:29:27.488678624Z level=info target=_rsplayground span=print span_path=print message=exit
ts=2025-08-29T13:29:27.488694014Z level=info target=_rsplayground span=print span_path=print message=close time.busy=20.5µs time.idle=23.7µs
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Description of Changes
When emitted, the span events look like this (for an imaginary function called
print, taking two arguments):This allows for some more fine-grain control over what's printed when spans are entered.
The defaults are kept; therefore, existing behavior does not change (i.e this is a non-breaking change).
Related Issues
None