When we examine the contents of a queue through the UI and select a
flowfile from the resulting list, we see FlowFile Details in the Details
tab. Are those key/values accessible from nifi expression language? I would
like to access Queued Duration. I have a queue that holds flowfiles with
non-successful return codes for calls to REST services, and I want to route
depending on how long these flowfiles have been sitting in my error queue
to isolate the window when the REST service was unavailable.
Thank you for any examples that show how we can access these keys and
values.
