1// Copyright 2018, OpenCensus Authors 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15package metricdata 16 17// LabelKey represents key of a label. It has optional 18// description attribute. 19type LabelKey struct { 20 Key string 21 Description string 22} 23 24// LabelValue represents the value of a label. 25// The zero value represents a missing label value, which may be treated 26// differently to an empty string value by some back ends. 27type LabelValue struct { 28 Value string // string value of the label 29 Present bool // flag that indicated whether a value is present or not 30} 31 32// NewLabelValue creates a new non-nil LabelValue that represents the given string. 33func NewLabelValue(val string) LabelValue { 34 return LabelValue{Value: val, Present: true} 35} 36