updates to sub usage

Author: gschatz-splunk

admin/subscription-usage/synthetics-usage.rst

@@ -20,9 +20,12 @@ Splunk Synthetic Monitoring offers metrics you can use to track your subscriptio
    * - :strong:`Metric`
      - :strong:`Description`
    * - ``sf.org.synthetics.limit.synthetics``
-     - Limit of number of MTS for that org.
-
-
+     - Total number of MTS generated by organization. 
+   * - ``synthetics.run.count``
+     - Total number of synthetic runs by organization. To filter by test type:
+        - ``test_type=browser``
+        - ``test_type=API``
+        - ``test_type= uptime`` 
 
 
 See also