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Apache Log4j 2
Apache Log4j 2 is a versatile, feature-rich, efficient logging API and backend for Java.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
The workarounds are posted by the log4j team here (https://logging.apache.org/log4j/2.x/) in their page, in case just upgrading is not an option.
I've used the internal dark mode and I love it. You can see a demo of it on my portfolio at https://charlesstover.com . It's just as easy for console teams to implement but there's always higher priority tasks for these services.
NOTE:
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Hence, a higher number means a more popular project.