SpringBoot Log4j2 configuration is not picking up logging.pattern.dateformat, logging.pattern.level

Using spring boot 2.3.3, the keys are inserted in context at org.springframework.boot.logging.LoggingSystemProperties#apply(org.springframework.boot.logging.LogFile) but not being used by default log4j2.xml

Seems the change needed is only (tested locally, by copying default configuration file)

!\org\springframework\boot\logging\log4j2\log4j2.xml

<Property name="CONSOLE_LOG_PATTERN">%clr{%d{${LOG_DATEFORMAT_PATTERN}}}{faint} %clr{${LOG_LEVEL_PATTERN}} %clr{%pid}{magenta} %clr{---}{faint} %clr{[%15.15t]}{faint} %clr{%-40.40c{1.}}{cyan} %clr{:}{faint} %m%n${sys:LOG_EXCEPTION_CONVERSION_WORD}</Property>
<Property name="FILE_LOG_PATTERN">%d{${LOG_DATEFORMAT_PATTERN}} ${LOG_LEVEL_PATTERN} %pid --- [%t] %-40.40c{1.} : %m%n${sys:LOG_EXCEPTION_CONVERSION_WORD}</Property>

into

<Property name="CONSOLE_LOG_PATTERN">%clr{%d{${sys:LOG_DATEFORMAT_PATTERN}}}{faint} %clr{${sys:LOG_LEVEL_PATTERN}} %clr{%pid}{magenta} %clr{---}{faint} %clr{[%15.15t]}{faint} %clr{%-40.40c{1.}}{cyan} %clr{:}{faint} %m%n${sys:LOG_EXCEPTION_CONVERSION_WORD}</Property>
<Property name="FILE_LOG_PATTERN">%d{${sys:LOG_DATEFORMAT_PATTERN}} ${sys:LOG_LEVEL_PATTERN} %pid --- [%t] %-40.40c{1.} : %m%n${sys:LOG_EXCEPTION_CONVERSION_WORD}</Property>

ie, prefixing with sys: as it was already done for sys:LOG_EXCEPTION_CONVERSION_WORD

Comment From: philwebb

Someone else also raised this recently. We'll track the fix in #22983.