[GitHub] [logging-log4j2] radut commented on pull request #472: Allow custom resolvers to be registered for JsonTemplateLayout

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radut commented on pull request #472:
URL: https://github.com/apache/logging-log4j2/pull/472#issuecomment-790543060


   `JsonTemplateLayout` is a good idea, you could define specific constants like `"@version": 1`(number) or lets say `"source" : "log4j"`(string). What I am looking for is rewrite the mdc resolver to be able to write numbers as json numbers, instead of string literals, usefull for indexing and searching in ElasticSearch with function like between x and y, without having another transformer on the way. 
   
   But most importantly I want to be able to pass specific `Markers` with a `JSON/map` attached to logging event, which is very usefull for that specific logging event. Currently it is possible to write only the name of the marker in my case something like `LS_MARKER` (https://github.com/radut/log4j2-logstash-layout/blob/67f3ea74bf061ee27a4c5405c59745a64a663a91/layout/src/main/java/org/apache/logging/log4j/core/LogStashMarker.java) , but instead I want to override the resolver and pull the `JSON` info and write it (eventually flatten) into the same json log event.
   
   Something similar I have done in the past here : https://github.com/radut/log4j2-logstash-layout/blob/67f3ea74bf061ee27a4c5405c59745a64a663a91/demo/src/main/java/com/radut/log4j/demo/LoggerMarkerTest.java#L52  with the serializerd : https://github.com/radut/log4j2-logstash-layout/blob/67f3ea74bf061ee27a4c5405c59745a64a663a91/layout/src/main/java/org/apache/logging/log4j/core/jackson/MarkerJsonSerializer.java a fork from https://github.com/majikthys/log4j2-logstash-jsonevent-layout.
   
   basically there is a `Map<String, Object>` which is serialized as JSON within a field or flattened.


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