span_context: Span context. If missing, the active context is used,
if any.
Value
The counter object itself, invisibly.
Details
Usually you do not need to deal with otel_counter objects directly.
counter_add() automatically sets up a meter and creates a counter
instrument, as needed.
A counter object is created by calling the create_counter() method
of an otel_meter_provider().
You can use the add() method to increment the counter by a positive
amount.