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app/vmselect: allow zero value for -search.latencyOffset command-line flag

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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2061#issuecomment-1299109836

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/218
This commit is contained in:
Aliaksandr Valialkin 2023-02-21 18:06:53 -08:00
parent 836d56876a
commit 10cf6c9781
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2 changed files with 5 additions and 2 deletions
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6
app/vmselect/prometheus/prometheus.go
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@ -1013,8 +1013,10 @@ func getRoundDigits(r *http.Request) int {
func getLatencyOffsetMilliseconds(r *http.Request) (int64, error) {
d := latencyOffset.Milliseconds()
if d <= 1000 {
d = 1000
if d < 0 {
// Zero latency offset may be useful for some use cases.
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2061#issuecomment-1299109836
d = 0
}
return searchutils.GetDuration(r, "latency_offset", d)
}

1
docs/CHANGELOG.md
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@ -31,6 +31,7 @@ The following tip changes can be tested by building VictoriaMetrics components f
* FEATURE: [MetricsQL](https://docs.victoriametrics.com/MetricsQL.html): add `range_trim_outliers(k, q)` function for dropping outliers located farther than `k*range_mad(q)` from the `range_median(q)`. This should help removing outliers during query time at [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3759).
* FEATURE: [MetricsQL](https://docs.victoriametrics.com/MetricsQL.html): add `range_trim_zscore(z, q)` function for dropping outliers located farther than `z*range_stddev(q)` from `range_avg(q)`. This should help removing outliers during query time at [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3759).
* FEATURE: [vmui](https://docs.victoriametrics.com/#vmui): show `median` instead of `avg` in graph tooltip and line legend, since `median` is more tolerant against spikes. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3706).
* FEATURE: allow setting zero value for `-search.latencyOffset` command-line flag. This may be needed in [some cases](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2061#issuecomment-1299109836). Previously the minimum supported value for `-search.latencyOffset` command-line flag was `1s`.
* BUGFIX: prevent from possible data ingestion slowdown and query performance slowdown during [background merges of big parts](https://docs.victoriametrics.com/#storage) on systems with small number of CPU cores (1 or 2 CPU cores). The issue has been introduced in [v1.85.0](https://docs.victoriametrics.com/CHANGELOG.html#v1850) when implementing [this feature](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3337). See also [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3790).
* BUGFIX: properly parse timestamps in milliseconds when [ingesting data via OpenTSDB telnet put protocol](https://docs.victoriametrics.com/#sending-data-via-telnet-put-protocol). Previously timestamps in milliseconds were mistakenly multiplied by 1000. Thanks to @Droxenator for the [pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/3810).