[prometheusreceiver] enable reporting of additional metrics #21064
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Feature: Enable reporting of additional metrics for Prometheus client used in PrometheusReceiver
Description:
Prometheus client has a featureFlag options.ExtraMetrics which reports content size metric (scrape_body_size_bytes) for successful scrapes and -1 for dropped data. This metric will help us collect data and setup alert for dropped data. However the prometheus receiver does not have a way to enable this feature flag.
This PR passes the flag to scrape.NewManager() to enable reporting of metric - scrape_body_size_bytes
Link to tracking Issue:
#21040
Testing:
Added check for validating the value set in testdata/config.yaml