Fix DNS watcher from clearing known endpoints on lookup failure#7698
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danielblando merged 5 commits intoJul 20, 2026
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Signed-off-by: Wilson La <wilsnlaa@amazon.com>
Signed-off-by: Wilson La <wilsnlaa@amazon.com>
friedrichg
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Thank you!. minor nit on the changelog
Co-authored-by: Friedrich Gonzalez <1517449+friedrichg@users.noreply.github.com> Signed-off-by: Wilson La <git@wilsonla.ca>
Signed-off-by: Friedrich Gonzalez <1517449+friedrichg@users.noreply.github.com>
danielblando
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Jul 20, 2026
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What this PR does:
Components like the querier and query-frontend use the DNSWatcher to handle resolution of addresses. When DNS lookups fail (due to an issue on the DNS server, for instance), the resolved address set is set to nil, which sends a Delete for every previously known address.
This PR changes the DNSWatcher to retain all previously known addresses during DNS resolution failures, to prevent queriers (for instance) from clearing all known DNS records.
Checklist
CHANGELOG.mdupdated - the order of entries should be[CHANGE],[FEATURE],[ENHANCEMENT],[BUGFIX]docs/configuration/v1-guarantees.mdupdated if this PR introduces experimental flags