Remove deprecated exemplar package. (#1124)
diff --git a/exemplar/exemplar.go b/exemplar/exemplar.go
deleted file mode 100644
index 5a4c434..0000000
--- a/exemplar/exemplar.go
+++ /dev/null
@@ -1,83 +0,0 @@
-// Copyright 2018, OpenCensus Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// Package exemplar implements support for exemplars. Exemplars are additional
-// data associated with each measurement.
-//
-// Their purpose it to provide an example of the kind of thing
-// (request, RPC, trace span, etc.) that resulted in that measurement.
-//
-// Deprecated: Use go.opencensus.io/metric/metricdata instead.
-package exemplar
-
-import (
- "context"
- "time"
-)
-
-// Exemplars keys.
-const (
- KeyTraceID = "trace_id"
- KeySpanID = "span_id"
- KeyPrefixTag = "tag:"
-)
-
-// Exemplar is an example data point associated with each bucket of a
-// distribution type aggregation.
-//
-// Deprecated: Use go.opencensus.io/metric/metricdata/exemplar instead.
-type Exemplar struct {
- Value float64 // the value that was recorded
- Timestamp time.Time // the time the value was recorded
- Attachments Attachments // attachments (if any)
-}
-
-// Attachments is a map of extra values associated with a recorded data point.
-// The map should only be mutated from AttachmentExtractor functions.
-type Attachments map[string]string
-
-// AttachmentExtractor is a function capable of extracting exemplar attachments
-// from the context used to record measurements.
-// The map passed to the function should be mutated and returned. It will
-// initially be nil: the first AttachmentExtractor that would like to add keys to the
-// map is responsible for initializing it.
-type AttachmentExtractor func(ctx context.Context, a Attachments) Attachments
-
-var extractors []AttachmentExtractor
-
-// RegisterAttachmentExtractor registers the given extractor associated with the exemplar
-// type name.
-//
-// Extractors will be used to attempt to extract exemplars from the context
-// associated with each recorded measurement.
-//
-// Packages that support exemplars should register their extractor functions on
-// initialization.
-//
-// RegisterAttachmentExtractor should not be called after any measurements have
-// been recorded.
-func RegisterAttachmentExtractor(e AttachmentExtractor) {
- extractors = append(extractors, e)
-}
-
-// AttachmentsFromContext extracts exemplars from the given context.
-// Each registered AttachmentExtractor (see RegisterAttachmentExtractor) is called in an
-// unspecified order to add attachments to the exemplar.
-func AttachmentsFromContext(ctx context.Context) Attachments {
- var a Attachments
- for _, extractor := range extractors {
- a = extractor(ctx, a)
- }
- return a
-}
