1// Copyright 2020 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package keys
6
7var (
8	// Msg is a key used to add message strings to label lists.
9	Msg = NewString("message", "a readable message")
10	// Label is a key used to indicate an event adds labels to the context.
11	Label = NewTag("label", "a label context marker")
12	// Start is used for things like traces that have a name.
13	Start = NewString("start", "span start")
14	// Metric is a key used to indicate an event records metrics.
15	End = NewTag("end", "a span end marker")
16	// Metric is a key used to indicate an event records metrics.
17	Detach = NewTag("detach", "a span detach marker")
18	// Err is a key used to add error values to label lists.
19	Err = NewError("error", "an error that occurred")
20	// Metric is a key used to indicate an event records metrics.
21	Metric = NewTag("metric", "a metric event marker")
22)
23