Hi all,

We always strive to only release industrial-strength components.

Following an internal discussion and looking at statistics from
several sources, the PMC plans to deprecate in the 2.x version several
components for removal in 3.x.

We know that statistics are not everything and that is why we would
like to hear your opinion on these modules. The discussion will be
open for a month, after which the PMC will announce a definitive list
of deprecations.

## `log4j-cassandra`:
    We support Cassandra 3.x. This release will reach end-of-life when
4.2.x is released[1]. Since the stats show marginal usage of the
module, there should be no `log4j-cassandra4`.

## CouchDB appender:
   It is even less used than Cassandra according to the stats.

## `log4j-docker`
    Seldom used and standard practice is generally to log to the
console and let the Docker environment add the data.

## GELF appender:
    It is mostly superseded by `JsonTemplateLayout`.

## Kafka appender:
    It contains several critical bug reports neither the PMC, nor the
community is willing to deal with.

## `log4j-kubernetes`:
    Seldom used and standard practice is generally to log to the
console and let the Docker environment add the data.

## JeroMQ appender:
    Since version 2.6 it had only one PR/bug report and it was from
PAX Logging maintainer. There is an alternative from a ZeroMQ
maintainer[2], Fabrice Bacchella, that provides important features
like encryption or choice of socket type.

## JNDI-related features:
    JNDI is an old technology from the times of ponies and unicorns,
when nobody cared about security. The Error Prone team decided to mark
JNDI usage as error by default[3].

## `log4j-jpa`:
    Has marginal downloads and requires a migration to Jakarta EE. I
think that `log4j-jdbc` (which is also seldom used) provides a good
alternative for SQL databases,

## Jackson based layouts (JsonLayout, XmlLayout, YamlLayout)
    We already provide `JsonTemplateLayout`; `XmlLayout` is seldom
used and `YamlLayout` as far as we know is not be used at all.

## `log4j-mongodb3`:
    Support for MongoDB 3.x ended two years ago.

## `log4j-spring-boot`:
    Its features are included in Spring Boot 3.x.

## SMTP appender:
    Its usage is at the bottom of the stats.

## `log4j-taglib`
    Also needs a Jakarta version, but it is based on a legacy
technology that is currently seldom used.

Waiting to hear your opinions,
Piotr

[1] 
https://cassandra.apache.org/_/blog/Behind-the-scenes-of-an-Apache-Cassandra-Release.html
[2] https://github.com/fbacchella/loghublog4j2
[3] https://errorprone.info/bugpattern/BanJNDI

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