Function histogram

Example

import { histogram, Histogram } from '@biorate/prometheus';

class Test {
  @histogram({
    name: 'test_histogram',
    help: 'Test histogram',
    labelNames: ['label1', 'label2'],
  })
  protected histogram: Histogram;

  public metric() {
    this.histogram.labels({ label1: 1, label2: 2 }).observe(10);
  }
}

const test = new Test();

test.metric();
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