[BUG] 当 远程集群domain 的 AGENT_WATCH_K8S 为空（没有 Agent 上报 cluster-id）时，Server 的 DomainChecker 在检查这个 domain 时遇到 nil 值导致 panic。

[1648503033jf-web]

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• I had searched in the issues and found no similar feature requirement.

DeepFlow Component

Agent

What you expected to happen

panic: interface conversion: interface {} is nil, not string
at domain.go:1129 checkAndAllocateController

How to reproduce

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DeepFlow version

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DeepFlow agent list

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Kubernetes CNI

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Operation-System/Kernel version

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Anything else

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Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[1648503033jf-web]

026-05-13 18:45:10.597 [INFO] [monitor/vtap] vtap.go:231 update vtap (dc036bdc-9e16-479f-9fe2-4ff9cc3740fc) az from to 873dbbc0-1b95-5e9e-9cf2-9e1f51ac90ff
2026-05-13 18:45:10.604 [INFO] [monitor/vtap] vtap.go:231 update vtap (1c826f0d-428b-431d-bbf3-f8af2e1354d5) az from to 873dbbc0-1b95-5e9e-9cf2-9e1f51ac90ff
2026-05-13 18:45:10.621 [INFO] [receiver] receiver.go:835 TCP client (10.160.138.11:38351) connect success, set read buffer 4194304.
2026-05-13 18:45:10.621 [WARN] [receiver] receiver.go:907 TCP client (10.160.138.11:38351) connection read error: read tcp 10.160.138.30:20033->10.160.138.11:38351: read: connection reset by peer
2026-05-13 18:45:10.684 [INFO] [http.service.vtap] vtap_interface.go:165 get vtap interfaces: http://127.0.0.1:20417/v1/sync/vinterface/
2026-05-13 18:45:10.713 [GIN] 127.0.0.1 GET /v1/sync/vinterface/ 200 28.654769ms
2026-05-13 18:45:10.746 [INFO] [tagrecorder] ch_alarm_policy.go:39 generate data for ch_alarm_policy
2026-05-13 18:45:10.765 [INFO] [receiver] receiver.go:835 TCP client (10.160.138.13:55398) connect success, set read buffer 4194304.
2026-05-13 18:45:10.765 [WARN] [receiver] receiver.go:907 TCP client (10.160.138.13:55398) connection read error: read tcp 10.160.138.30:20033->10.160.138.13:55398: read: connection reset by peer
2026-05-13 18:45:10.776 [INFO] [trisolaris.synchronize] tsdb.go:77 ctrl_ip is 127.0.0.1, (platform data version 1778667678 -> 0), (acl version 3778667653 -> 0), (groups version 1778667653 -> 0), NAME:server-pod-names-watcher
2026-05-13 18:45:11.647 [INFO] [service.resource] domain.go:1105 check domain controller health started
panic: interface conversion: interface {} is nil, not string

goroutine 73321 [running]:
github.com/deepflowio/deepflow/server/controller/http/service/resource.(*DomainChecker).checkAndAllocateController(0x19e2a1cf5f88?, 0x19e279180100)
/home/runnerx/actions-runner/_work/deepflow/deepflow/server/controller/http/service/resource/domain.go:1129 +0x9e5
github.com/deepflowio/deepflow/server/controller/http/service/resource.(*DomainChecker).CheckRegularly.func1()
/home/runnerx/actions-runner/_work/deepflow/deepflow/server/controller/http/service/resource/domain.go:1093 +0x151
created by github.com/deepflowio/deepflow/server/controller/http/service/resource.(*DomainChecker).CheckRegularly in goroutine 247
/home/runnerx/actions-runner/_work/deepflow/deepflow/server/controller/http/service/resource/domain.go:1085 +0x74
➜ deepflow-dashboard git:(main) ✗