Component(s)

receiver/prometheus

Describe the issue you're reporting

In ancient times, Prometheus Receiver was implemented with options to process a particular metric not as a metric, but as a timestamp that would be used to populate the StartTimeUnixNano field in all other metrics that were being scraped together.

Since then, the community has noticed several problems with this approach and decided to migrate this functionality to another component: processor/metricstarttime.

This means that such functionality and configuration should be deprecated and eventually removed from Prometheus Receiver. The migration to metricstarttimeprocessor should also be properly documented.

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