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 15 package metricdata 16 17 import ( 18 "time" 19 ) 20 21 // Exemplars keys. 22 const ( 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. 31 type 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. 38 type Attachments map[string]interface{} 39