include href attribute for SRI custom metric

[tomvangoethem]

<link> elements can have SRI, but use a href attribute to point to the resource

[rviscomi]

LGTM. Does this mean the August data is incorrect?

[tomvangoethem]

There's still the data for <script> elements, which have the src attribute (which make up the majority of elements using SRI), so it's not that much of an issue.
I queried just the script elements here

[rviscomi]

Sounds good. Be aware that the October crawl has already started, so the link[href] data won't be in before the November crawl, which will be queryable in December. So I hope you're not waiting on it for the 2020 Almanac 😁