The TRR lookup time is a full HTTPS request round-trip to the resolver, which in most practical cases will be multiple up to many milliseconds. The current telemetry shows a shocking amount of zero millisecond resolves, indicating this is wrongly measured.
Comment on attachment 8986715 [details] bug 1470093 - fix telemetry::DNS_TRR_LOOKUP_TIME https://reviewboard.mozilla.org/r/252012/#review258482
Attachment #8986715 - Flags: review?(mcmanus) → review+
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/integration/autoland/rev/f9c5cbd49b98 fix telemetry::DNS_TRR_LOOKUP_TIME r=mcmanus
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