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 17import ( 18 "time" 19) 20 21// Exemplars keys. 22const ( 23 AttachmentKeySpanContext = "SpanContext" 24) 25 26// Exemplar is an example data point associated with each bucket of a 27// distribution type aggregation. 28// 29// Their purpose is to provide an example of the kind of thing 30// (request, RPC, trace span, etc.) that resulted in that measurement. 31type Exemplar struct { 32 Value float64 // the value that was recorded 33 Timestamp time.Time // the time the value was recorded 34 Attachments Attachments // attachments (if any) 35} 36 37// Attachments is a map of extra values associated with a recorded data point. 38type Attachments map[string]interface{} 39