In certain cases it is useful to send back, to client, some sort of context information about the outcome of operation. For instance, when change in configuration warrants another one and without it, after reload/restart server could not operate properly. For instance
Scope of this enhancement are:
a) way to send back information
b) control level of "information" - just like in case of loggers
a) Information will be sent in response headers, under "warnings" key. Each entry, "warning" will contain operation, address, level/severity and i18n string with proper ID.
b) default level threshold would be "WARNING", if user requires more detailed information, he can request it via operation-headers->warninig-level