Github user ottobackwards commented on the issue:
https://github.com/apache/metron/pull/1184
If you think the "every line fails" == fail, some fails = emit and log
works, we can do that, but I don't know how or if we want to put things in the
error stream. I need to look at it more closely. I think that solving this
might be beyond this pr, with a documentation note as you state.---
