piotrp commented on PR #29120:
URL: https://github.com/apache/flink/pull/29120#issuecomment-5811401143

   Ok,. will post it today.
   
   As for the _silently gone_ part, there will be a warning from SLF4J logged 
to stderr. After I start Flink with invalid bindings in lib/ directory:
   ```
   jobmanager-1   | SLF4J(W): No SLF4J providers were found.
   jobmanager-1   | SLF4J(W): Defaulting to no-operation (NOP) logger 
implementation
   jobmanager-1   | SLF4J(W): See https://www.slf4j.org/codes.html#noProviders 
for further details.
   
   jobmanager-1   | SLF4J(W): Class path contains SLF4J bindings targeting 
slf4j-api versions 1.7.x or earlier.
   jobmanager-1   | SLF4J(W): Ignoring binding found at 
[jar:file:/opt/flink/lib/log4j-slf4j-impl-2.26.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
   jobmanager-1   | SLF4J(W): See 
https://www.slf4j.org/codes.html#ignoredBindings for an explanation.
   ```


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