createObservableUpDownCounter

Fully qualified name: omni::observability::createObservableUpDownCounter

Defined in omni/observability/IMetrics.h

template<class ValueType>
carb::ObjectPtr<IObservableInstrument> omni::observability::createObservableUpDownCounter(

const carb::ObjectPtr<IMeter> &meter,

ObservableInstrumentCallback<ValueType> callback,

void *context,

carb::cpp::string_view name,

carb::cpp::string_view description,

carb::cpp::string_view unit = "",

)

Create an observable up/down counter instrument with the specified ValueType.

Remark

This is a convenience namespace-scope function template that is implemented in terms of the corresponding IMeter member function template. The meter argument is permitted to be null, in which case a null instrument pointer is returned.

Parameters:

• meter – [in] The meter to create the observable up/down counter with.

• callback – [in] The callback function to invoke for sampling the counter value.

• context – [in] User-defined context passed to the callback.

• name – [in] The name of the observable up/down counter instrument.

• description – [in] A description of what the observable up/down counter measures.

• unit – [in] The unit of measurement (e.g., “bytes”, “connections”).

Returns:

An carb::ObjectPtr to the created observable up/down counter, or nullptr on failure.