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authorGarrett D'Amore <garrett@damore.org>2024-10-15 20:31:04 -0700
committerGarrett D'Amore <garrett@damore.org>2024-10-15 20:31:04 -0700
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Stats API converted to mdbook.
A number of small errors were fixed, and we tried to restructure this to be a bit more usable to readers.
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-= nng_stats_get(3)
-//
-// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
-// Copyright 2018 Capitar IT Group BV <info@capitar.com>
-//
-// This document is supplied under the terms of the MIT License, a
-// copy of which should be located in the distribution where this
-// file was obtained (LICENSE.txt). A copy of the license may also be
-// found online at https://opensource.org/licenses/MIT.
-//
-
-== NAME
-
-nng_stats_get - get statistics snapshot
-
-== SYNOPSIS
-
-[source, c]
-----
-#include <nng/nng.h>
-
-typedef struct nng_stat nng_stat;
-
-int nng_stats_get(nng_stat **statsp)
-----
-
-== DESCRIPTION
-
-The `nng_stat_get()` function attempts to obtain a snapshot of all the
-various diagnostic statistics that are present in the system.
-
-NOTE: The process of collecting statistics is designed to have minimal
-impact on the system, but there is still some impact.
-
-The statistics are organized as a tree, rooted with a parent
-statistic of type `NNG_STAT_SCOPE` that carries no value, and which
-has an empty name.
-This parent statistic is returned through the _statsp_ pointer.
-
-The xref:nng_stat_child.3.adoc[`nng_stat_child()`] and
-xref:nng_stat_next.3.adoc[`nng_stat_next()`] function can be used to
-iterate over the the tree.
-
-When no longer needed, the statistics can be freed with the
-xref:nng_stats_free.3.adoc[`nng_stats_free()`] function, but that
-function must be called only with the root statistic that is returned
-through the _statsp_ pointer.
-
-NOTE: The values of individual statistics are guaranteed to be atomic,
-but due the way statistics are collected there can be discrepancies between them at certain times.
-For example, statistics counting bytes and messages received may not
-reflect the same number of messages, depending on when the snapshot is taken.
-This potential inconsistency arises as a result of optimizations to minimize
-the impact of statistics on actual operations.
-
-NOTE: The names, values, and semantics of statistics provided may change
-from release to release.
-These are provided for informational and debugging use only, and applications
-should not rely on the presence, names, or meanings of any individual statistics.
-
-== RETURN VALUES
-
-This function returns a pointer to the allocated memory on success,
-and `NULL` otherwise.
-
-== ERRORS
-
-[horizontal]
-`NNG_ENOMEM`:: Insufficient free memory to collect statistics.
-`NNG_ENOTSUP`:: Statistics are not supported (compile time option).
-
-== SEE ALSO
-
-[.text-left]
-xref:nng_stats_free.3.adoc[nng_stats_free(3)],
-xref:nng_stat_child.3.adoc[nng_stat_child(3)],
-xref:nng_stat_desc.3.adoc[nng_stat_desc(3)],
-xref:nng_stat_name.3.adoc[nng_stat_name(3)],
-xref:nng_stat_next.3.adoc[nng_stat_next(3)],
-xref:nng_stat_string.3.adoc[nng_stat_string(3)],
-xref:nng_stat_type.3.adoc[nng_stat_type(3)],
-xref:nng_stat_timestamp.3.adoc[nng_stat_timestamp(3)],
-xref:nng_stat_unit.3.adoc[nng_stat_unit(3)],
-xref:nng_stat_value.3.adoc[nng_stat_value(3)],
-xref:nng_stat.5.adoc[nng_stat(5)],
-xref:nng.7.adoc[nng(7)]