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docs: add README for request-metadata-extractor plugin - #313

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magic-peach:docs/request-metadata-extractor-readme
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magic-peach wants to merge 1 commit into
llm-d:mainfrom
magic-peach:docs/request-metadata-extractor-readme

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What type of PR is this?
/kind documentation

What this PR does / why we need it:

Adds a README.md for the request-metadata-extractor datalayer plugin (pkg/framework/plugins/datalayer/requestmetadata/), which had none. The directory previously only had plugin.go and plugin_test.go. The new README documents what the plugin does, how it processes RequestEventType and ResponseEventType events, the request-metadata attribute it writes, the counter-leak limitation already called out in the plugin's own doc comment, and its single-goroutine concurrency assumption, following the same format used by the other plugin READMEs in this repo (for example requestcostmetadata/README.md and modelconfigcollector/README.md).

Which issue(s) this PR fixes:
Fixes #194

Release note (write NONE if no user-facing change):

NONE

Documents purpose, event handling, the request-metadata attribute,
known counter-leak limitation, and concurrency assumptions, matching
the format used by other plugin READMEs in this repo.

Signed-off-by: Akanksha Trehun <akankshatrehun@gmail.com>
@github-actions github-actions Bot added size/M Denotes a PR that changes 30-99 lines, ignoring generated files. kind/documentation Categorizes issue or PR as related to documentation. labels Sep 4, 2026
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kind/documentation Categorizes issue or PR as related to documentation. size/M Denotes a PR that changes 30-99 lines, ignoring generated files.

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[documentation] missing README for request-metadata-extractor plugin

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