Add a note on DNSSEC sign metrics in the ARM

This was added previously in commit
3a3f40e3729e1e3ab32f6c18eeecfd4749812ffb but was lost when the
documentation was converted to RST files.

(cherry picked from commit 3a3ace0f412459c903190e08cad49e2cd5fff81c)

diff --git a/doc/arm/reference.rst b/doc/arm/reference.rst
index 0f34930543daaf109ba9203faf29075e7059726a..b356911b9046795b653f5f5e40a687e135815b48 100644 (file)
--- a/doc/arm/reference.rst
+++ b/doc/arm/reference.rst
@@ -1538,8 +1538,10 @@ default is used.
    If ``full``, the server collects statistical data on all zones,
    unless specifically turned off on a per-zone basis by specifying
    ``zone-statistics terse`` or ``zone-statistics none`` in the ``zone``
-   statement. The default is ``terse``, providing minimal statistics on
-   zones (including name and current serial number, but not query type
+   statement. These include, for example, DNSSEC signing operations
+   and the number of authoritative answers per query type.  The
+   default is ``terse``, providing minimal statistics on zones
+   (including name and current serial number, but not query type
    counters).
 
    These statistics may be accessed via the ``statistics-channel`` or