This terraform-plugin-sdk (v1) analyzer has been removed in tfproviderlint v0.30.0.
The V004 analyzer reports usage of the deprecated SingleIP validation function that should be replaced with IsIPAddress.
ValidateFunc: validation.SingleIP(),
ValidateFunc: validation.IsIPAddress,
Singular reports can be ignored by adding the a //lintignore:V004
Go code comment at the end of the offending line or on the line immediately proceding, e.g.
//lintignore:V004
ValidateFunc: validation.SingleIP(),