[native] Prestissimo worker metrics documentation

presto-docs/src/main/sphinx/presto_cpp/features.rst

@@ -22,8 +22,8 @@ HTTP endpoints related to tasks are registered to Proxygen in
 
 Other HTTP endpoints include:
 
-* POST: v1/memory
-  * Reports memory, but no assignments are adjusted unlike in Java workers.
+* POST: v1/memory: Reports memory, but no assignments are adjusted unlike in Java workers
+* GET: v1/info/metrics: Returns worker metrics in Prometheus format
 * GET: v1/info
 * GET: v1/status
 
@@ -185,6 +185,20 @@ Old task is defined as a PrestoTask which has not received heartbeat for at leas
 ``old-task-cleanup-ms``, or is not running and has an end time more than
 ``old-task-cleanup-ms`` ago.
 
+Worker metrics collection
+-------------------------
+
+Users can enable collection of worker level metrics by setting the property:
+
+``runtime-metrics-collection-enabled``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+* **Type:** ``boolean``
+* **Default value:** ``false``
+
+  If the Presto C++ server was compiled with
+  PRESTO_ENABLE_PROMETHEUS_REPORTER set to ON, the server exposes an endpoint ``/v1/info/metrics`` to collect
+  metrics in prometheus format.
+
 
 Session Properties
 ------------------

presto-docs/src/main/sphinx/presto_cpp/properties.rst

@@ -127,6 +127,13 @@ The configuration properties of Presto C++ workers are described here, in alphab
 
   The exceeding capacity must allocate from the non-reserved query memory.
 
+``runtime-metrics-collection-enabled``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+* **Type:** ``boolean``
+* **Default value:** ``false``
+
+  Enables collection of worker level metrics.
+
 ``system-memory-gb``
 ^^^^^^^^^^^^^^^^^^^^