docs: statistics as a single chapter.

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diff --git a/docs/ref/api/stat/index.md b/docs/ref/api/stat/index.md
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-# Statistics
-
-To facilitate debugging and support situations, the _NNG_ library
-supports collection and reporting of numerous statistics.
-
-These statistics are organized in a tree, and include both values,
-and metadata describing the statistics. In order to be efficient and
-minimize the impact of maintaining statistics, an explicit snapshot
-of statistics must be taken, and that snapshot can then be processed.
-
-The following documentation will be useful:
-
-- [nng_stat](./nng_stat.md) - Single statistic
-- [nng_stats](./nng_stats.md) - Statistics snapshot
-
-> [!NOTE]
-> The presence, name, and semantics of any given statistic are
-> subject to change at any time and without notice.
-> Programmatic use is therefore discouraged.
-
-> [!NOTE]
-> Statistics may be disabled by build-time configuration options,
-> in order to reduce program size and run-time overheads.
diff --git a/docs/ref/api/stat/nng_stat.md b/docs/ref/api/stat/nng_stat.md
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-# nng_stat
-
-## NAME
-
-nng_stat --- statistic
-
-## SYNOPSIS
-
-```c
-#include <nng/nng.h>
-
-typedef struct nng_stat nng_stat;
-
-enum {
-	NNG_STAT_SCOPE,
-	NNG_STAT_LEVEL,
-	NNG_STAT_COUNTER,
-	NNG_STAT_STRING,
-	NNG_STAT_BOOLEAN,
-	NNG_STAT_ID
-};
-
-enum {
-	NNG_UNIT_NONE,
-	NNG_UNIT_BYTES,
-	NNG_UNIT_MESSAGES,
-	NNG_UNIT_MILLIS,
-	NNG_UNIT_EVENTS
-};
-
-int nng_stat_unit(nng_stat *stat);
-
-const char *nng_stat_name(nng_stat *stat);
-const char *nng_stat_desc(nng_stat *stat);
-int nng_stat_type(nng_stat *stat);
-int nng_stat_unit(nng_stat *stat);
-uint64_t nng_stat_value(nng_stat *stat);
-const char *nng_stat_string(nng_stat *stat);
-bool nng_stat_bool(nng_stat *stat);
-uint64_t nng_stat_timestamp(nng_stat *stat);
-```
-
-## DESCRIPTION
-
-An {{i:`nng_stat`}} represents a {{i:statistic}}.
-All statistics have names (retrievable with {{i:`nng_stat_name`}}) and
-descriptions (retrievable with {{i:`nng_stat_desc`}}), and a
-type (retrievable with {{i:`nng_stat_type`}}).
-
-Statistics also have a timestamp indicating when the value was sampled,
-obtained via {{i:`nng_stat_timestamp`}}. The timestamp is given in
-in milliseconds since a reference time, and the reference time used
-here is the same reference time used for [`nng_clock`][nng_clock].
-
-> [!NOTE]
-> The presence, name, and semantics of any given statistic are
-> subject to change at any time and without notice.
-
-### Statistic Values
-
-The type of a statistic determines the nature of the value, and which
-function can be used to obtain that value.
-
-- {{i:`NNG_STAT_SCOPE`}}: The statistic does not carry any real value, but is
-  used for grouping related statistics together. This is a nexus in the
-  statistics tree.
-
-- {{i:`NNG_STAT_COUNTER`}}: The statistic is a counter that only increments.
-  Usually the change in the value of the statistic is more interesting
-  (as a rate) than the absolute value at any given time. The value should
-  be obtained using `nng_stat_value`. The units will be given by the value
-  returned from `nng_stat_unit`.
-
-- {{i:`NNG_STAT_LEVEL`}}: The statistic represnts a measured value which corresponds
-  to a specific value at a specific time. For example, this may represent the
-  number of messages currently queued for some operation, or the link speed
-  of a network interface. Most often the absolute value is more interesting
-  than the change in the value over time. Again the value can be obtained with
-  `nng_stat_value`, and any appropriate unit of measurement with `nng_stat_unit`.
-
-- {{i:`NNG_STAT_STRING`}}: The statistic is a string, such as a human. The value
-  of the string can be obtained with `nng_stat_string`. The value of this string
-  will remain valid until the snapshot is deallocated with [`nng_stats_free`][nng_stats].
-
-- {{i:`NNG_STAT_BOOLEAN`}}: The value of the statistic is a truth value (either `true`
-  or `false`) and can be obtained with `nng_stat_bool`.
-
-- {{i:`NNG_STAT_ID`}}: The value of the statistic is a numeric identifier, such as a socket
-  identifier. The value can be obtained with `nng_stat_value`, and will generally not
-  change over time for a given statistic.
-
-### Statistic Units
-
-For statistics of type `NNG_STAT_COUNTER` or `NNG_STAT_LEVEL`, it is often
-useful to know what that quantity being reported actually measures.
-The following units may be returned from `nng_stat_unit` for such a statistic:
-
-- `NNG_UNIT_NONE`: No unit is known or applies.
-- `NNG_UNIT_BYTES`: A count of bytes.
-- `NNG_UNIT_MESSAGES`: A count of messages.
-- `NNG_UNIT_MILLIS`: A count of milliseconds.
-- `NNG_UNIT_EVENTS`: A count of events of some type.
-
-## SEE ALSO
-
-[nng_clock][nng_clock],
-[nng_stats][nng_stats],
-
-[nng_clock]: ../util/nng_clock.md
-[nng_stats]: ./nng_stats.md
diff --git a/docs/ref/api/stat/nng_stats.md b/docs/ref/api/stat/nng_stats.md
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-# nng_stats
-
-## NAME
-
-nng_stats --- statistics snapshot
-
-## SYNOPSIS
-
-```c
-#include <nng/nng.h>
-
-typedef struct nng_stat nng_stat;
-
-int nng_stats_get(nng_stat **statsp);
-void nng_stats_free(nng_stat *stats);
-nng_stat *nng_stat_next(nng_stat *stat);
-nng_stat *nng_stat_find(nng_stat *stat, const char *name);
-nng_stat *nng_stat_find_dialer(nng_stat *stat, nng_dialer dialer);
-nng_stat *nng_stat_find_listener(nng_stat *stat, nng_dialer listener);
-nng_stat *nng_stat_find_socket(nng_stat *stat, nng_dialer socket);
-```
-
-## DESCRIPTION
-
-Statistics maintained by the system are organized in a tree, and
-a snapshot of all statistics can be taken, and then traversed
-and searched.
-
-### Statistics Snapshot Collection
-
-The {{i:`nng_stats_get`}} function attempts to obtain a snapshot of all the
-various diagnostic statistics that are present in the system.
-On success, a pointer to the statistics tree snapshot is returned in _statsp_.
-
-> [!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.
-
-When no longer needed, the statistics snapshot can be freed with the
-{{i:`nng_stats_free`}} function.
-
-> [!IMPORTANT]
-> The `nng_stats_free` 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.
-
-### Traversing the Statistics Tree
-
-Traversing the tree of statistics is done using the `nng_stat_child` and
-`nng_stat_next` functions.
-
-The `nng_stat_child` function returns either the first child of _stat_,
-or `NULL` if the _stat_ has no children.
-
-The `nng_stat_next` function returns the nearest sibling to the right of _stat_,
-or `NULL` if _stat_ has no more siblings to the right.
-
-### Finding a Statistic
-
-Sometimes it is easiest to search for a specific statistic, matching by name,
-or possibly to find the tree of statistics associated iwth a specific [socket][nng_socket],
-[dialer][nng_dialer], or [listener][nng_listener].
-
-The `nng_stat_find` functions are provided for this purpose.
-
-The `nng_stat_find` function returns the first statistic within the subtree of
-statistics _stat_, with the given _name_. If no such statistic can be found, `NULL`
-is returned.
-
-The `nng_stat_find_dialer`, `nng_stat_find_listener`, and `nng_stat_find_socket` return
-the statistics subtree for the given dialer, listener, or socket object. Note that
-these functions should be provided the root of the statistic tree, in order to ensure
-that they can find the desired object.
-
-## RETURN VALUES
-
-The `nng_stats_get` function returns zero on success, or a non-zero error value on failure.
-
-Aside from `nng_stats_free`, which has no return, the remaining functions return a pointer to
-the desired statistic object, or `NULL` if such a statistic cannot be found.
-
-## ERRORS
-
-- `NNG_ENOMEM`: Insufficient free memory to collect statistics.
-- `NNG_ENOTSUP`: Statistics are not supported (compile time option).
-
-## SEE ALSO
-
-[nng_stat][nng_stat]
-
-[nng_stat]: ./nng_stat.md
-[nng_socket]: TODO.md
-[nng_dialer]: TODO.md
-[nng_listener]: TODO.md