A key used to refer to a data value associated with a metric. Note that a UserDataKey can be used by clients of balm to associate additional information with a metric. See balm_metricregistry for information on obtaining a unique key.
A key used to refer to a data value associated with a metric. Note that a UserDataKey can be used by clients of balm to associate additional information with a metric. See balm_metricregistry for information on obtaining a unique key.