[target-allocator] Remove json conversion from /scrape_configs #1411
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fixes #1404
This change is breaking in that the scrape configs endpoint will now response with YAML instead of JSON. However, the prometheus receiver which sends requests to
/scrape_configsis currently usingyam.Unmarshal: https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/72d590e8e76a18bbec6d4ce8b6200520c5e94732/receiver/prometheusreceiver/metrics_receiver.go#L205-L233This doesn't give us a large performance gain (compared to using jsoniter), but it is noticeable in benchmarks:
scrapeconfig_bench_results.txt