DNS Validation in Load Balancer Collector Caps Address Length at 63 Characters Instead of 255

[diamonwiggins]

Bug Description

The function used from the Kubernetes validation library to validate DNS addresses during the preflight check for load balancer addresses imposes an unintended 63-character limit. This limit stems from the validation criteria used for pod/service DNS names, but in the case of load balancer addresses, the specified address can be up to 255 characters. The validation should allow for the full 255-character length rather than being capped at 63 characters.

Expected Behavior

Compliant DNS addresses are respected in the tcpLoadBalancer collector

Steps To Reproduce

1. Run a preflight check for a load balancer address using an address longer than 63 characters.
2. Observe that the validation fails despite the address being under the 255-character limit.

Additional Context

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• Troubleshoot version. If you built from source, note that including the version of Go you used to build with.

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• Other details that might be helpful in diagnosing the problem

• Troubleshoot v0.103.0