Collect stats from the data members of a struct or a class, annotate
them with a given label name and value, and prepare them to be fetched
upon the next call to getCollection.
The specifications of the format of the collected stats can be found
at https://prometheus.io/docs/instrumenting/exposition_formats/.
Collect stats from the data members of a struct or a class, annotate them with a given label name and value, and prepare them to be fetched upon the next call to getCollection. The specifications of the format of the collected stats can be found at https://prometheus.io/docs/instrumenting/exposition_formats/.