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feat: Tell serving locations what each load balancer needs - #628
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Each location checks its load balancer backends with TCP, HTTP or HTTPS probes, and only backends with a recent successful check are eligible for traffic, so a failed backend stops receiving new connections on its own. Key changes: - Add a cell-local backend health record and probe runner - Fail closed when a probe fails, is missing or goes stale - Require a matching attachment UID before probing a backend - Report that probing is unavailable until a location can reach VPC backends
Each location that will serve a load balancer now receives what it needs to serve: the address, port, backends and health check settings. Locations validate this request but do not program traffic yet. Key changes: - Publish scoped cell intent per listener and per-location IPv6 address - Hold back setups the data plane cannot serve yet, such as several addresses on one listener or more than 64 backends - Withdraw old intent when a route is removed or an address changes
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Closed by mistake while restacking; continued in #716.
Related to #611 and datum-cloud/enhancements#884