Katip 
Katip is a structured logging framework for Haskell.
Kâtip (pronounced kah-tip) is the Turkish word for scribe.
katip
This is the core katip logging library. It includes a file handle logger.
See katip's README for more details.
katip-elasticsearch
ElasticSearch backend for katip using the bloodhound package.
See katip-elasticsearch's README for more details.