[atchernych]

Summary

This is the Karmada Specific implementation. This will serve as a feed into the more generic Kubernetes implementation in #15949.

Fixes DEP-1290

POC of a Global Discovery HTTP service for the multi-cluster Global Router. Instead of a static pool list, the router can learn its pools from Kubernetes multi-cluster services (MCS) imported by Karmada.

• Runs in the hub cluster. It watches the EndpointSlices that Karmada's EndpointSlice controller imports and serves the KV DC Relay pools as JSON on GET /pools. GET /healthz turns ready after the first full list.
• A Relay exported as Service relay-<dgd> maps to pool (<cluster>, <namespace>, <dgd>). Karmada adds no source-cluster label, so the cluster comes from the imported slice name (imported-<cluster>-<service>-<suffix>).
• One index entry per slice, updated per watch event and replaced as a whole on relist. The watch uses kube-rs backoff.
• Behind the new global-discovery-poc feature of dynamo-llm, so default builds are unchanged.
• Adds container/Dockerfile.global-discovery-poc and container/global-discovery-poc.yaml (read-only EndpointSlice access, Deployment, Service).

Stacked on #15579. It is a working stand-in for the Kubernetes PoolDirectory sketched in #15949; the plan is to move this logic behind that trait later.

Not in this PR: the router reading /pools.

Validation

• cargo test -p dynamo-llm --no-default-features --features global-discovery-poc --bin global-discovery-poc: 9 tests pass (site parsing, non-Relay services skipped, not-ready pools, IPv6 URLs, delete, relist).
• cargo clippy on the binary: no warnings in the new file. cargo fmt --check: clean.
• Manually, on two EKS clusters joined to Karmada in Pull mode: a Relay exported from one cluster appears in the hub as derived-relay-<dgd> with an imported-<cluster>-... slice, which is the input this service reads. The service itself is not yet deployed there.

🤖 Generated with Claude Code

[devin-ai-integration]

❌ Dynamo PR CI failed — run 38987872826 (attempt 1) on 77fb662dca

Gate checks: ❌ backend-status-check · ❌ deploy-status-check · ❌ dynamo-status-check

Other	Jobs
changed-files	❌ 1

Failure details

1 job failed: changed-files rejects two new files that no CI filter covers, so every downstream job was skipped.

❌ changed-files: files not covered by any CI filter

Job: changed-files · Failed step: Check for changes · Logs: gh run view --job 117263440876 -R ai-dynamo/dynamo --log-failed

##[error]The following files are not covered by any CI filter:
container/Dockerfile.global-discovery-poc
container/global-discovery-poc.yaml

Please add these paths to .github/filters.yaml
See .github/FILTERS.md for documentation
##[error]Process completed with exit code 1.

The uncovered-files check failed because container/Dockerfile.global-discovery-poc and container/global-discovery-poc.yaml don't match any filter in .github/filters.yaml. Adding these paths to a filter (see .github/FILTERS.md) should fix it.

For agents

{"pr": 16714, "run_id": 38987872826, "run_attempt": 1, "head_sha": "77fb662dca4fb29d860d411c0973be57f99e155b",
 "failures": [{"job": "changed-files", "job_id": 117263440876, "failed_step": "Check for changes", "signature": "files not covered by any CI filter: container/Dockerfile.global-discovery-poc, container/global-discovery-poc.yaml", "tests": [], "log_cmd": "gh run view --job 117263440876 -R ai-dynamo/dynamo --log-failed"}]}

_{Posted automatically by Devin for run 38987872826. Updated on every full-CI run of this PR.}

[atchernych]

Closing: superseded by the Global Discovery Service from #15949, which now lives in lib/global-discovery-service on global-router-v2 (3e9358c).