1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package exemplar // import "go.opentelemetry.io/otel/sdk/metric/exemplar"
import (
"context"
"go.opentelemetry.io/otel/trace"
)
// Filter determines if a measurement should be offered.
//
// The passed ctx needs to contain any baggage or span that were active
// when the measurement was made. This information may be used by the
// Reservoir in making a sampling decision.
type Filter func(context.Context) bool
// TraceBasedFilter is a [Filter] that will only offer measurements
// if the passed context associated with the measurement contains a sampled
// [go.opentelemetry.io/otel/trace.SpanContext].
func TraceBasedFilter(ctx context.Context) bool {
return trace.SpanContextFromContext(ctx).IsSampled()
}
// AlwaysOnFilter is a [Filter] that always offers measurements.
func AlwaysOnFilter(ctx context.Context) bool {
return true
}
|
