Only show deprecation warnings for CN-based verification once #24948
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What does this PR do?
I haven't tracked down all of the code paths that call
Validate
, but customers are complaining about how much noise this deprecation warning is adding to their logs. I think it makes sense just to warn once, so it should be enough just to wrap this in a globalsync.Once
.Checklist
- [ ] I have commented my code, particularly in hard-to-understand areas- [ ] I have made corresponding changes to the documentation- [ ] I have made corresponding change to the default configuration files- [ ] I have added tests that prove my fix is effective or that my feature works- [ ] I have added an entry inCHANGELOG.next.asciidoc
orCHANGELOG-developer.next.asciidoc
.