'Why Prometheus counters and gauges in Java need to be static?

I see in the documentation that the counters and gauges are initialized as static members: https://github.com/prometheus/client_java#counter

import io.prometheus.client.Counter;
class YourClass {
  static final Counter requests = Counter.build()
     .name("requests_total").help("Total requests.").register();

  void processRequest() {
    requests.inc();
    // Your code here.
  }
}

I cannot find any information why. Is there any specific reason for this? Or is it just to make it uniform with loggers?

javaprometheusgrafanaprometheus-java


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