GEOMESA-3518 Docs - Update NiFi metrics docs (#3432)

Author: elahrvivaz

docs/user/nifi/converters.rst

@@ -25,8 +25,6 @@ specifying the input source:
 +-------------------------------+-----------------------------------------------------------------------------------------+
 | ``ExtraClasspaths``           | Additional resources to add to the classpath, e.g. converter and SFT definitions        |
 +-------------------------------+-----------------------------------------------------------------------------------------+
-| ``ConverterMetricsRegistry``  | Reference to :ref:`nifi_metrics` for publishing metrics                                 |
-+-------------------------------+-----------------------------------------------------------------------------------------+
 
 Additionally, the ``PutGeoMesa`` processor accepts additional configuration:
 

docs/user/nifi/datastores.rst

@@ -6,6 +6,14 @@ Data Store Services
 GeoMesa processors require a ``DataStoreService`` to connect to the back-end data source. To use a controller services,
 first add one to the workspace and then configure its properties tab. The following data stores are available in GeoMesa:
 
+Most data stores support publishing metrics to a registry:
+
++-------------------------------+-----------------------------------------------------------------------------------------+
+| Property                      | Description                                                                             |
++===============================+=========================================================================================+
+| ``MetricsRegistry``           | Reference to :ref:`nifi_metrics` for publishing metrics                                 |
++-------------------------------+-----------------------------------------------------------------------------------------+
+
 HBase
 ~~~~~