Add advance warning on json format for query.log

Author: NataliaIvakina

modules/ROOT/pages/monitoring/logging.adoc

@@ -1193,6 +1193,13 @@ In Neo4j Browser and Bloom, the user-provided metadata is always replaced by the
 
 === Use JSON format for the query log
 
+[NOTE]
+====
+The current default appender format for the query log is <<#general-logging-pattern-layout, the plain text format>>. +
+Starting with a release following the next LTS version, the default query log format for new installations will change to `JSON`.
+You will still be able to use the plain text format by setting it explicitly within the _Appenders_ element.
+====
+
 The query log can use a JSON layout.
 To change the format, the layout for the `QueryLogger` must be changed from using the `PatternLayout`: