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Instead of tagging events with their type, instead we infer the type from the label pattern. The standard event creators all have a matching test that returns true if the the labels pattern matches the ones that would be built by the creator. Spans and logs already have a unique label pattern, other event types required a special label marker. This makes the system much more extensible, and also cleans up some the API. Change-Id: I1fbc9ec07aa84ead6c12bbd5ca65b13b605bfa4a Reviewed-on: https://go-review.googlesource.com/c/tools/+/229242 Run-TryBot: Ian Cottrell <iancottrell@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
23 lines
961 B
Go
23 lines
961 B
Go
// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package keys
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var (
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// Msg is a key used to add message strings to label lists.
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Msg = NewString("message", "a readable message")
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// Label is a key used to indicate an event adds labels to the context.
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Label = NewTag("label", "a label context marker")
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// Start is used for things like traces that have a name.
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Start = NewString("start", "span start")
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// Metric is a key used to indicate an event records metrics.
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End = NewTag("end", "a span end marker")
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// Metric is a key used to indicate an event records metrics.
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Detach = NewTag("detach", "a span detach marker")
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// Err is a key used to add error values to label lists.
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Err = NewError("error", "an error that occurred")
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// Metric is a key used to indicate an event records metrics.
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Metric = NewTag("metric", "a metric event marker")
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)
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