The ActionName that is passed in the trackAction call,
will be sent each time the trackAction is called. The value that is captured, does not expire, and is captured and reported each time it is sent.
You can think of it similar to a s.tl() call for the web, in Mobile the trackAction is basically a custom track link call. You can pass optional evars, events in contextData that will have expiration, allocation etc, as you have defined for each of the variables.
Jen