High CPU consumption of PrometheusHandler

[mahendrapaipuri]

Problem

It seems like PrometheusHandler is consuming CPU even when there is no activity. More discussion in discourse thread.

We are setting up a PeriodicCallback for this handler which is eventually consuming that CPU. The not so clear part is that this handler is not registered with any endpoint for Prometheus to scrape the data. So, maybe this is vestigial piece of code?

Proposed Solution

If this PrometheusHandler is not critical, maybe we can set default config of enable_prometheus_metrics to False.

If PrometheusHandler is indeed unusable in the current state, we need to fix it for Prometheus to be able to scrap the metric data.

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