DOCS-5619: Annotate buildInfo flag support

source/reference/command/buildInfo.txt

@@ -51,41 +51,37 @@ Output
 
    The document returned by the :dbcommand:`buildInfo` command.
 
+Supported
+~~~~~~~~~
+
+These fields are stable and should provide consistent behavior.
+
 .. data:: buildInfo.gitVersion
 
    The commit identifier that identifies the state of the code used
    to build the :program:`mongod`.
 
-.. data:: buildInfo.sysInfo
-
-   A string that holds information about the operating system,
-   hostname, kernel, date, and Boost version used to compile the
-   :program:`mongod`.
-
-.. data:: buildInfo.loaderFlags
-
-   The flags passed to the loader that loads the :program:`mongod`.
-
-.. data:: buildInfo.compilerFlags
+.. data:: buildInfo.versionArray
 
-   The flags passed to the compiler that builds the
-   :program:`mongod` binary.
+   An array that conveys version information about the
+   :program:`mongod` instance. See :data:`~buildInfo.version` for a
+   more readable version of this string.
 
-.. data:: buildInfo.allocator
+.. data:: document buildInfo.version
 
-   .. versionchanged:: 2.2
+   A string that conveys version information about the
+   :program:`mongod` instance. If you need to present version information to
+   a human, this field is preferable to :data:`~buildInfo.versionArray`.
 
-   The memory allocator that :program:`mongod` uses. By default
-   this is ``tcmalloc`` after version 2.2, and ``system`` before
-   2.2.
+   This string will take the format ``<major>.<minor>.<patch>`` in the case of
+   a release, but development builds may contain additional information.
 
-.. data:: buildInfo.versionArray
+.. data:: document buildInfo.storageEngines
 
-   An array that conveys version information about the
-   :program:`mongod` instance. See :data:`~buildInfo.version` for a
-   more readable version of this string.
+   .. versionadded:: 3.2
 
-.. TODO:: document buildInfo.version
+   A list of :doc:`storage engines </faq/storage>` avilable to the
+   :program:`mongod` server.
 
 .. data:: buildInfo.javascriptEngine
 
@@ -108,3 +104,39 @@ Output
 
    A number that reports the :limit:`Maximum BSON Document Size
    <BSON Document Size>`.
+
+.. data:: buildInfo.openssl
+
+   An embedded document describing the version of OpenSSL that :program:`mongod`
+   was built with, as well as the version of OpenSSL that :program:`mongod`
+   is currently using.
+
+.. data:: buildInfo.modules
+
+   A list of add-on modules that :program:`mongod` was built with. Possible
+   values currently include "enterprise" and "rocksdb".
+
+Unstable
+~~~~~~~~
+
+These fields are for internal use only, and you should not expect their behavior
+or existence to remain consistent on any level.
+
+.. data:: buildInfo.sysInfo
+
+   .. deprecated:: 3.2
+
+   :data:`buildInfo.sysInfo` no longer contains useful information.
+
+.. data:: buildInfo.allocator
+
+   .. versionchanged:: 2.2
+
+   The memory allocator that :program:`mongod` uses. By default
+   this is ``tcmalloc`` after version 2.2, and ``system`` before
+   2.2.
+
+.. data:: buildInfo.buildEnvironment
+
+   An embedded document containing various debugging information about the
+   :program:`mongod` build environment.