+Takes a snapshot of the tracing session named 'SESSION' like
+man:lttng-snapshot(1) would.
++
+When the condition of the trigger is satisfied, the tracing session
+named 'SESSION', if any, must be a snapshot-mode tracing session
+(see man:lttng-create(1)).
++
+If no tracing session has the name 'SESSION' when LTTng is ready to
+execute the action, LTTng does nothing.
++
+See below for the nloption:--rate-policy option.
+
+Common action options (as of LTTng{nbsp}{lttng_version}):
+
+nloption:--rate-policy='POLICY'::
+ Set the rate policy of the action to 'POLICY'.
++
+A trigger which ``fires'' (its condition is satisfied) leads to an
+execution request for each of its actions, in order. An execution
+request of a given action{nbsp}__A__ first increments the execution
+request count{nbsp}__C__ of{nbsp}__A__. An execution request can then
+become an actual execution when{nbsp}__C__ satisfies the rate policy
+of{nbsp}__A__.
++
+The default action rate policy is `every:1` (always execute{nbsp}__A__).
+Use this option to specify another rate policy.