docs - resgroup memory_auditor updates to cat/view/gptoolkit (#4871)

* docs - resgroup memory_auditor to cat/view/gptoolkit

* cgroup mem usage output - used and limit_granted

* updates for code refactor that was just merged

* type to text

gpdb-doc/dita/ref_guide/gp_toolkit.xml

@@ -1623,6 +1623,10 @@
                 <entry colname="col1" class="- topic/entry ">proposed_memory_spill_ratio</entry>
                 <entry colname="col2" class="- topic/entry ">The pending memory spill ratio value for the resource group.</entry>
               </row>
+              <row class="- topic/row ">
+                <entry colname="col1" class="- topic/entry ">memory_auditor</entry>
+                <entry colname="col2" class="- topic/entry ">The memory auditor for the resource group.</entry>
+              </row>
             </tbody>
           </tgroup>
         </table>
@@ -1703,13 +1707,17 @@
           <codeph>1</codeph> are running on the same host; their CPU usage
           is the same.</p> 
         <p id="json_field_info2">The <codeph>memory_usage</codeph> field is also a JSON-formatted,
-          key:value string. This string identifies, for each resource group, the
-          used, available, granted, and proposed fixed and shared memory quota 
-          allocations on each segment. The key is segment id. The values are 
-          memory values displayed in MB units. Example
-          <codeph>memory_usage</codeph> column output for a
-          single segment:<codeblock>
-"0":{"used":0, "available":76, "quota_used":-1, "quota_available":60, "quota_granted":60, "quota_proposed":60, "shared_used":0, "shared_available":16, "shared_granted":16, "shared_proposed":16}</codeblock></p>
+          key:value string. The string contents differ depending upon the type of resource
+          group. For each resource group that you assign to a role (default memory auditor <codeph>vmtracker</codeph>), this string
+          identifies the used, available, granted, and proposed fixed and shared memory
+          quota allocations on each segment. The key is segment id. The values are 
+          memory values displayed in MB units. The following example shows
+          <codeph>memory_usage</codeph> column output for a single segment for a resource group that you assign to a role:<codeblock>
+"0":{"used":0, "available":76, "quota_used":-1, "quota_available":60, "quota_granted":60, "quota_proposed":60, "shared_used":0, "shared_available":16, "shared_granted":16, "shared_proposed":16}</codeblock>
+         For each resource group that you assign to
+          an external component, the <codeph>memory_usage</codeph> JSON-formatted string identifies the memory used
+          and the memory limit on each segment.  The following example shows
+          <codeph>memory_usage</codeph> column output for an external component resource group for a single segment: <codeblock>"1":{"used":11, "limit_granted":15}</codeblock></p>
       </body>
     </topic>
   </topic>

gpdb-doc/dita/ref_guide/system_catalogs/gp_resgroup_config.xml

@@ -113,6 +113,14 @@
             <entry colname="col3">pg_resgroupcapability.proposed for pg_resgroupcapability.reslimittype> = 5</entry>
             <entry colname="col4">The pending memory spill ratio value for the resource group.</entry>
           </row>
+          <row>
+            <entry colname="col1">
+              <codeph>memory_auditor</codeph>
+            </entry>
+            <entry colname="col2">text</entry>
+            <entry colname="col3">pg_resgroupcapability.value for pg_resgroupcapability.reslimittype = 6</entry>
+            <entry colname="col4">The memory auditor in use for the resource group.</entry>
+          </row>
         </tbody>
       </tgroup>
     </table>

gpdb-doc/dita/ref_guide/system_catalogs/pg_resgroupcapability.xml

@@ -47,7 +47,7 @@
             <entry colname="col3">
               <codeph></codeph>
             </entry>
-            <entry colname="col4">The resource group limit type:<p>0 - Unknown</p><p>1 - Concurrency</p><p>2 - CPU</p><p>3 - Memory</p><p>4 - Memory shared quota</p><p>5 - Memory spill ratio</p>
+            <entry colname="col4">The resource group limit type:<p>0 - Unknown</p><p>1 - Concurrency</p><p>2 - CPU</p><p>3 - Memory</p><p>4 - Memory shared quota</p><p>5 - Memory spill ratio</p><p>6 - Memory auditor</p>
             </entry>
           </row>
           <row>