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 5 package keys
6 7 var (
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