Merge pull request ceph#65015 from connorfawcett/pg-autoscale-threshold-cmd

mgr/pg_autoscaler: Add 'osd pool get threshold' command which returns the current threshold value

Author: connorfawcett

doc/rados/operations/placement-groups.rst

@@ -161,6 +161,12 @@ The output will resemble the following::
 
      ceph osd pool set threshold 2.0
 
+  To get the current ``threshold`` value, run the following command:
+
+  .. prompt:: bash #
+
+     ceph osd pool get threshold
+
 - **AUTOSCALE** is the pool's ``pg_autoscale_mode`` and is set to ``on``,
   ``off``, or ``warn``.
 

src/pybind/mgr/pg_autoscaler/module.py

@@ -240,13 +240,23 @@ def _command_autoscale_status(self, format: str = 'plain') -> Tuple[int, str, st
     def set_scaling_threshold(self, num: float) -> Tuple[int, str, str]:
         """
         set the autoscaler threshold 
-        A.K.A. the factor by which the new PG_NUM must vary from the existing PG_NUM
+        A.K.A. the factor by which the new pg_num must vary
+        from the existing pg_num before action is taken
         """
         if num < 1.0:
             return 22, "", "threshold cannot be set less than 1.0"
         self.set_module_option("threshold", num)
         return 0, "threshold updated", ""
 
+    @CLIReadCommand("osd pool get threshold")
+    def get_scaling_threshold(self) -> Tuple[int, str, str]:
+        """
+        return the autoscaler threshold value
+        A.K.A. the factor by which the new pg_num must vary
+        from the existing pg_num before action is taken
+        """
+        return 0, str(self.get_module_option('threshold')), ''
+
     def complete_all_progress_events(self) -> None:
         for pool_id in list(self._event):
             ev = self._event[pool_id]