// API request, then the valueExpression will be evaluated for
  // each binding. All unique values produced by the valueExpressions
  // will be joined together in a comma-separated list.
  //
  // Required.
  optional string valueExpression = 2;
}

// ExpressionWarning is a warning information that targets a specific expression.
message ExpressionWarning {

  // +optional
  optional int32 failed = 6;

  // completedIndexes holds the completed indexes when .spec.completionMode =
  // "Indexed" in a text format. The indexes are represented as decimal integers
  // separated by commas. The numbers are listed in increasing order. Three or
  // more consecutive numbers are compressed and represented by the first and
  // last element of the series, separated by a hyphen.