Is there an existing issue for this?

• I have searched the existing issues

Version

equal or higher than v1.15.7 and lower than v1.16.0

What happened?

There is a bug when a service with a sharing key gets deleted. Cilium stops announcing the IP even if there are other LoadBalancer services that are still using it.

How can we reproduce the issue?

1. Create 2 services that share an IP by using the lbipam.cilium.io/sharing-key annotation.
2. Announce those services via bgp.
3. Delete one of the services.
4. See that the announcement of the ip was removed.

Cilium Version

1.15.8

Kernel Version

6.10.7

Kubernetes Version

1.28.13

Regression

No response

Sysdump

No response

Relevant log output

No response

Anything else?

No response

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