SLF4Js fluent API

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Discussed in #2375

^{Originally posted by vhf-cmatejka January 30, 2026}
Hello,
are there any plans to add support for ch.qos.logback.classic.spi.ILoggingEvent's KVPs?
We are currently migrating the logging in our Lambdas to AWS Powertools but we make heavy use of SLF4J's fluent API and KVPs are ignored by software.amazon.lambda.powertools.logging.logback.LambdaJsonEncoder.

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PR #2377 created by @cmtjk.

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The purpose of this feature request is to support adding custom keys using SLF4J fluent API:

        log.atInfo().setMessage("Processing event").addKeyValue("eventId", eventId).log();

Using Powertools structured arguments in this case is not possible because SLF4J does not provide an argument overload for the setMessage() method.