Series limit in the Prometheus metrics browser

Introducing the Series limit in the Metrics browser.

On occasion, a Prometheus instance may contain a metric that has many, many series. When this happens the metrics browser can become slow or break when searching labels on a metric.

The series limit places a hard limit on series returned so that the frontend is not impacted by processing potentially hundreds of thousands of series. Users can adjust the limit or remove it by entering ‘none’ into the input.