jmeter-prometheus-plugin

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During load test with about 2k threads about 30% of all threads are blocked at: com.github.johrstrom.collector.JMeterCollectorRegistry#getOrCreateAndRegister(BaseCollectorConfig cfg)

What is thre reason here to use synchronized method? registered is alread ConcurrentHashMap.

You can use registered.computeIfAbsent(BaseCollectorConfig key, Function<BaseCollectorConfig, Collector> mappingFunction) And threads will not be blocked on each method call after first key creation.

Hi! Thanks for the issue and the potential fix. I however, don't actively maintain this much anymore so am unlikely to do the work. Happy to evaluate and potentially merge a pull request though!