Jiri-Kremser commented on a change in pull request #2413: Integration with 
OpenTracing api
URL: 
https://github.com/apache/incubator-openwhisk/pull/2413#discussion_r125122479
 
 

 ##########
 File path: 
core/controller/src/main/scala/whisk/core/controller/actions/SequenceActions.scala
 ##########
 @@ -353,6 +369,24 @@ protected[actions] trait SequenceActions {
 
     /** Max atomic action count allowed for sequences */
     private lazy val actionSequenceLimit = 
whiskConfig.actionSequenceLimit.toInt
+
+    /** Starts the tracing for the sequence action and creates the tracing 
metadata hash map into which
+     *  the tracer implementation  inserts its own ids, these ids are then 
propagated via the ActivationMessage into
+     *  invoker that can add the reference from the primitive action to the 
parent sequence action
+     */
+    private def startTracingHelper(cause: Option[ActivationId],
 
 Review comment:
   I wasn't aware of the markers in the akka logging system. Do I get it right 
that you [use 
it](https://github.com/apache/incubator-openwhisk/blob/master/common/scala/src/main/scala/whisk/common/Logging.scala#L125)
 for calculating how long some execution took?
 
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