Handle programatically added log4j2 LoggerConfig #5902
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* The goal of this is to be able to bind to a newly added `LoggerConfig` even if the `Configuration` is the same * This means we always need to check if the filter was already added to avoid adding it twice * We need to keep track of if anything was changed to avoid an endless loop when we call `updateLoggers()` Signed-off-by: Patrik Ivarsson <[email protected]>
shakuzen
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Feb 12, 2025
...meter-core/src/test/java/io/micrometer/core/instrument/binder/logging/Log4j2MetricsTest.java
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Signed-off-by: Patrik Ivarsson <[email protected]>
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The needed change for being able to bind to programmatically added loggers is simply to remove
listener.getOldValue() != listener.getNewValue().However, when we do that it leads to three things:
MetricsFilteris already added to avoid adding it again on configuration reloadupdateLoggers()to avoid an endless loop (as the listener will be triggered again when callingupdateLoggers()Configurationto the conditional beforeremoveMetricsFilterto avoid removing all filters when we reload with the sameConfigurationinstanceI did this by returning whether a
MetricsFilterwas added or not fromregisterMetricsFilter(). I tried out some different ways of doing this, but I ended up refactoring it a bit and I think it ended up quite readable.I have also included a test that adds a logger programmatically (which would fail without these changes). It also verifies that
updateLoggers()is called once with the newMetricsFilterconfigured, as expected.Resolves #5901