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* feat(kubernetes): support HA gateway rebalancing Signed-off-by: Drew Newberry <anewberry@nvidia.com> * perf(server): cache peer connections, tokens, and owner lookups Every forwarded relay rebuilt its setup from scratch: an owner lookup, a blocking read of the peer token, a TLS connect to the owning replica, and a TokenReview plus Pod GET on the receiving side. Sandbox service routing does this per HTTP request, so the apiserver calls scaled with traffic. Cache all of it on ServerState: - peer channels pooled per endpoint, so relays multiplex over one connection instead of redialing - peer tokens keyed by SHA-256, expiring at min(ttl, token exp) so a hit cannot accept an expired token - owner records for 3s against a 45s ownership TTL, still freshness checked before use Entries are evicted when a relay fails. Also raise HTTP/2 max_concurrent_streams to 1024, since pooling funnels every relay between two replicas onto one connection and hyper's default of 200 sits below the 256 pending-relay budget. Signed-off-by: divesh <dgude@nvidia.com> * perf(server): pool upstream connections for sandbox services Each HTTP request to a sandbox service opened its own supervisor relay, paying a new TCP connection and HTTP/1 handshake every time. Worse, it counted against the 32 in-flight relay cap, so a service handling more than 32 concurrent requests failed outright. Pool idle upstreams per endpoint and port, up to 8 each for 15s. Reuse is safe because the pool only returns a connection hyper reports as ready, and HTTP/1 cannot start a request until the previous body has drained. Upgrades are never pooled since they take the connection over, and a failed send evicts that endpoint. Pruning is bounded per key, with the full sweep limited to once per 30s. Signed-off-by: divesh <dgude@nvidia.com> * fix(server): address HA gateway review findings (#3449) - Let a gateway own supervisor sessions without a peer endpoint. Requiring one whenever the store is PostgreSQL broke every single-instance PostgreSQL deployment, because no sandbox supervisor could connect. A cross-replica request to an owner that advertises no endpoint now fails immediately naming the cause, instead of retrying until the wait timeout. - Close a supervisor session on heartbeat only when another replica owns it, or after renewals fail for the ownership TTL. A database error no longer drops every session heartbeating during an outage. - Clamp owner record ages at zero so a skewed or corrupt stored timestamp cannot produce a negative age. - Bound the cross-object advisory lock with a lock timeout, so a stuck holder fails instead of blocking every mutation in the fleet. - Refuse to start when a peer endpoint is configured on a multi-replica backend but peer authentication is unavailable, and warn when a multi-replica backend has no peer endpoint at all. - Reject a plaintext peer endpoint when the gateway serves TLS. - Skip the sandbox watch poller on single-replica backends, where the local update bus already sees every write. - Rate-limit the peer owner cache sweep so an insert no longer scans the whole map under the lock. - Retry GET and HEAD on a pooled upstream the sandbox closed, instead of returning 502, and drop an emptied endpoint from the pool right away. - Document the gateway peer environment variables and the post-rollout ownership skew operators should expect. Signed-off-by: divesh <dgude@nvidia.com> * fix(server): harden HA supervisor ownership Signed-off-by: Drew Newberry <anewberry@nvidia.com> --------- Signed-off-by: Drew Newberry <anewberry@nvidia.com> Signed-off-by: divesh <dgude@nvidia.com> Co-authored-by: Drew Newberry <anewberry@nvidia.com> Co-authored-by: divesh <dgude@nvidia.com> Co-authored-by: Divesh Chowdary <47188680+FrostGod@users.noreply.github.com>