Configuration for dynamically deciding what to print in access logs

[dotansimha]

Attributes

Users may want to control which attributes (header/pre-compiled values) are printed in the access log (summary). This can be done via configuration.

Naming

Control how to expose specific attributes (under what name in the json log line)

Filtering

Users may want to filter out all "normal" requests, and to print only log lines for requests that are either slow, or containing errors.