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In Go, the first letter of an identifier (function, variable, struct field, etc.) determines its visibility outside the package:

1. Uppercase first letter: The identifier is exported and accessible from other packages
2. Lowercase first letter: The identifier is non-exported and only accessible within its package

Always follow these rules:

• Use uppercase for functions intended as public API:

  // Exported - can be called from other packages
  func DisableCullingAnnotationIsSet(meta metav1.ObjectMeta) bool {
    // implementation
  }
  

• Use lowercase for functions meant for internal use only:

  // Non-exported - only callable within the same package
  func exists(slice []string, val string) bool {
    for _, item := range slice {
        if item == val {
            return true
        }
    }
    return false
  }
  

• Name functions to accurately reflect their purpose and return type. Boolean functions should use predicate naming (is, has, can*).

• For struct fields, use uppercase to allow external access and lowercase to restrict access:

  type MetricsExporter struct {
    Component string    // Exported - accessible
    metricsPort int     // Non-exported - internal only
  }
  

• Use consistent error variable names, typically err rather than custom names like kfErr, generateErr, etc.

This convention is a critical part of Go’s visibility system and module design - it’s not just a style preference but affects how your code can be used by others.