Refactoring classes away from static holders, modernised metrics. #32
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Context
We had a service, mishandling transactions, running OOM from abandoned transactions tracking. It is based on single-threaded Cleaner.
Fixing that, I also decided to do some facelift/modernisation for the library.
Changed
Refactored the classes and initialisation setup away from static classes.
Made abandoned transactions tracking configurable.
Migrated from JMX to Micrometer.
Checklist