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lib/decimal: rename significant decimal digits to significant figures (#698)

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The previous notion was inconsistent with what `decimal.Round` does.
According to [wiki](https://en.wikipedia.org/wiki/Significant_figures) rounding
applied to all significant figures, not just decimal ones.
This commit is contained in:
Roman Khavronenko 2020-08-16 15:21:35 +01:00 committed by GitHub
parent 147c35ebd4
commit f5f59896ec
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 6 additions and 6 deletions
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10
app/vmagent/remotewrite/remotewrite.go
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@ -31,8 +31,8 @@ var (
"for each -remoteWrite.url. When buffer size reaches the configured maximum, then old data is dropped when adding new data to the buffer. "+
"Buffered data is stored in ~500MB chunks, so the minimum practical value for this flag is 500000000. "+
"Disk usage is unlimited if the value is set to 0")
decimalPlaces = flag.Int("remoteWrite.decimalPlaces", 0, "The number of significant decimal places to leave in metric values before writing them to remote storage. "+
"See https://en.wikipedia.org/wiki/Significant_figures . Zero value saves all the significant decimal places. "+
significantFigures = flag.Int("remoteWrite.significantFigures", 0, "The number of significant figures to leave in metric values before writing them to remote storage. "+
"See https://en.wikipedia.org/wiki/Significant_figures . Zero value saves all the significant figures. "+
"This option may be used for increasing on-disk compression level for the stored metrics")
)
@ -124,13 +124,13 @@ func Stop() {
//
// Note that wr may be modified by Push due to relabeling and rounding.
func Push(wr *prompbmarshal.WriteRequest) {
if *decimalPlaces > 0 {
// Round values according to decimalPlaces
if *significantFigures > 0 {
// Round values according to significantFigures
for i := range wr.Timeseries {
samples := wr.Timeseries[i].Samples
for j := range samples {
s := &samples[j]
s.Value = decimal.Round(s.Value, *decimalPlaces)
s.Value = decimal.Round(s.Value, *significantFigures)
}
}
}

2
lib/decimal/decimal.go
View file

@ -256,7 +256,7 @@ func maxUpExponent(v int64) int16 {
}
}
// Round f to value with the given number of significant decimal digits.
// Round f to value with the given number of significant figures.
func Round(f float64, digits int) float64 {
if digits <= 0 || digits >= 18 {
return f