Yu Long

feat(parser.prometheusremotewrite): Add dense metric version to better support histograms

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## Summary Split v1/v2 metric parser version for `prometheusremotewrite` format, emulating that in `prometheus` format. V2 is the original, existing behavior.Code is directly lifted from the original `plugins/parsers/prometheusremotewrite/parser.go`. This PR...

feat(serializer.prometheusremotewrite): output native histogram

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## Summary Be able to output prom native histogram when necessary fields are present. ## Checklist - [ ] No AI generated code was used in this PR ## Related...

`retry_on_http_429: false` no effect when configured for static agent

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### What's wrong? `retry_on_http_429: false` should suppress agent from retrying on code 429, but it does not. ### Steps to reproduce using this config for prometheus remote write ``` "remote_write":...