A few notes on the header ABNF:
* Omit the header field-name and colon from the `Server-Timing` rule.
* Reference RFC7230, Section 7 for the `#` extension.
* Reference RFC5234 for ABNF.
* `metric` allows OWS around the "=", unlike RFC7231 `parameter`. Is this intentional?
* `metric-value` allows an empty value (e.g., "foo="); is this intentional? If so, it should be called out in prose.
* Is using non-ascii characters in `metric-name` and/or `description` a desired use? If so, you need to define an encoding, e.g., [RFC5987bis](https://datatracker.ietf.org/doc/draft-ietf-httpbis-rfc5987bis/).
See also the [checklist for new header fields](http://httpwg.org/specs/rfc7231.html#considerations.for.new.header.fields).
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