I think it may be undocumented because it is not like other request.meta values. All other documented request.meta values allow to control how Scrapy processes request (i.e. user should write to them), but download_latency is a value user reads read from, not writes to.
request.meta['download_latency']can be useful for analysing a spider or a website, but it's not documented (see #2021).
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