# nng_stat(5) Manual Page

## NAME

nng_stat - statistic

## SYNOPSIS

    #include <nng/nng.h>

    typedef struct nng_stat nng_stat;

## DESCRIPTION

An `nng_stat` represents a statistic. All statistics have names (`nng_stat_name()`) and descriptions (`nng_stat_desc()`), and are typed (`nng_stat_type()`).

Most statistics are numeric, and thus carry a value (`nng_stat_value()`) and frequently also a unit that the value measures (`nng_stat_unit()`).

Some statistics however, are simply strings (`nng_stat_string()`), and thus carry no numeric value.

Statistics are organized as a tree, and any given statistic can have siblings (`nng_stat_next()`). Note however that generally only `NNG_STAT_SCOPE` statistics, which are act as placeholders in the tree (and carry no value), will have children (`nng_stat_child()`).

A tree of statistics is collected using `nng_stats_get()`, and can be freed when no longer needed with `nng_stats_free()`. This collection process is generally performed in a way to minimize impact to running operations, but there is still some impact caused by collection of statistics.

The time when a statistic’s value is captured can be obtained using `nng_stat_timestamp()`, which is useful for measuring rates of change in certain statistics.

| The presence, names, and meanings of any given statistic are subject to change at any time. These statistics are provided as an aid for debugging, and should generally not be relied upon for programmatic behaviors.

| Statistics may be disabled by build-time configuration options, in order to reduce program size and run-time overheads.

## SEE ALSO

libnng(3), nng_stats_free(3), nng_stats_get(3), nng_stat_child(3), nng_stat_desc(3), nng_stat_find(3), nng_stat_find_dialer(3), nng_stat_find_listener(3), nng_stat_find_socket(3), nng_stat_name(3), nng_stat_next(3), nng_stat_string(3), nng_stat_timestamp(3), nng_stat_type(3), nng_stat_unit(3), nng_stat_value(3), nng(7)