Not switched on
Useful1 Signal3
Skipped artifact thumbnails get logged and warned about, but only under a flag that's off.
Thumbnail skip telemetry and publish warnings exist but fire only behind a thumbnail flag that is off by default.
What's wrong with this entry?
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What
A failed or skipped thumbnail read during artifact publish is recorded as an event, and the reason is passed back to the caller as a publish warning. It fires only when the thumbnail feature flag is on, which it is not by default in this build.
Evidence
g("artifact_publish", "thumbnail_skipped")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.