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change comment that allows timestamps to be optional
Signed-off-by: Callum Styan <callumstyan@gmail.com>
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@ -107,15 +107,10 @@ message Exemplar {
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// value represents an exact example value. This can be useful when the exemplar
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// is attached to a histogram, which only gives an estimated value through buckets.
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double value = 2;
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// timestamp represents an optional timestamp of the sample in ms.
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// timestamp represents the timestamp of the exemplar in ms.
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//
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// For Go, see github.com/prometheus/prometheus/model/timestamp/timestamp.go
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// for conversion from/to time.Time to Prometheus timestamp.
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//
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// Note that the "optional" keyword is omitted due to
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// https://cloud.google.com/apis/design/design_patterns.md#optional_primitive_fields
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// Zero value means value not set. If you need to use exactly zero value for
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// the timestamp, use 1 millisecond before or after.
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int64 timestamp = 3;
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}
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