[wp-trac] [WordPress Trac] #52099: Sitemaps "Last Modified" (lastmod) tag

[WordPress Trac]

#52099: Sitemaps "Last Modified" (lastmod) tag
-------------------------+-----------------------------
 Reporter:  junaidbhura  |       Owner:  (none)
     Type:  enhancement  |      Status:  reopened
 Priority:  normal       |   Milestone:  Future Release
Component:  Sitemaps     |     Version:  5.5
 Severity:  normal       |  Resolution:
 Keywords:  needs-patch  |     Focuses:  performance
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Changes (by swissspidy):

 * keywords:  has-patch has-unit-tests => needs-patch
 * status:  closed => reopened
 * focuses:   => performance
 * resolution:  wontfix =>
 * milestone:   => Future Release


Comment:

 Reopening after talking to @garyillyes regarding #53740.

 While Google does not currently use `<lastmod>`, other search engines
 consume it to schedule crawls more effectively, saving resources and
 decreasing load on sites.

 It's true that we removed `lastmod` originally to keep things simple and
 performant, perhaps there is some middle ground where we can add it
 without much overhead.

 For example, adding lastmod for posts is probably trivial, but for other
 entries and especially the homepage it might not be, and we could consider
 those cases plugin territory.

 Expensive queries could be cached via `wp_cache_add` or similar to ensure
 there's no impact on larger sites.

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Ticket URL: <https://core.trac.wordpress.org/ticket/52099#comment:9>
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