Function counter

Example

import { counter, Counter } from '@biorate/prometheus';

class Test {
  @counter({
    name: 'test_counter',
    help: 'Test counter',
    labelNames: ['label1', 'label2'],
  })
  protected counter: Counter;

  public metric() {
    this.counter.labels({ label1: 1, label2: 2 }).inc();
  }
}

const test = new Test();

test.metric();
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