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Added humanizePercentage formatting to templates (#5670)

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Lots of alerts are based on ratios (eg. disk usage), and humans are used
to values in percentage in textual descriptions.

Signed-off-by: Jens Erat <email@jenserat.de>
This commit is contained in:
Jens Erat 2019-06-15 09:59:57 +02:00 committed by Brian Brazil
parent 0c0638b080
commit 375aeb9158
4 changed files with 10 additions and 0 deletions
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1
console_libraries/prom.lib
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@ -36,6 +36,7 @@ var PATH_PREFIX = "{{ pathPrefix }}";
{{ define "humanizeNoSmallPrefix" }}{{ if and (lt . 1.0) (gt . -1.0) }}{{ printf "%.3g" . }}{{ else }}{{ humanize . }}{{ end }}{{ end }}
{{ define "humanize1024" }}{{ humanize1024 . }}{{ end }}
{{ define "humanizeDuration" }}{{ humanizeDuration . }}{{ end }}
{{ define "humanizePercentage" }}{{ humanizePercentage . }}{{ end }}
{{ define "humanizeTimestamp" }}{{ humanizeTimestamp . }}{{ end }}
{{ define "printf.1f" }}{{ printf "%.1f" . }}{{ end }}
{{ define "printf.3g" }}{{ printf "%.3g" . }}{{ end }}

1
docs/configuration/template_reference.md
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@ -56,6 +56,7 @@ If functions are used in a pipeline, the pipeline value is passed as the last ar
| humanize | number | string | Converts a number to a more readable format, using [metric prefixes](https://en.wikipedia.org/wiki/Metric_prefix).
| humanize1024 | number | string | Like `humanize`, but uses 1024 as the base rather than 1000. |
| humanizeDuration | number | string | Converts a duration in seconds to a more readable format. |
| humanizePercentage | number | string | Converts a ratio value to a fraction of 100. |
| humanizeTimestamp | number | string | Converts a Unix timestamp in seconds to a more readable format. |
Humanizing functions are intended to produce reasonable output for consumption

3
template/template.go
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@ -243,6 +243,9 @@ func NewTemplateExpander(
}
return fmt.Sprintf("%.4g%ss", v, prefix)
},
"humanizePercentage": func(v float64) string {
return fmt.Sprintf("%.4g%%", v*100)
},
"humanizeTimestamp": func(v float64) string {
if math.IsNaN(v) || math.IsInf(v, 0) {
return fmt.Sprintf("%.4g", v)

5
template/template_test.go
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@ -197,6 +197,11 @@ func TestTemplateExpansion(t *testing.T) {
input: []float64{math.Inf(1), math.Inf(-1), math.NaN()},
output: "+Inf:+Inf:+Inf:+Inf:-Inf:-Inf:-Inf:-Inf:NaN:NaN:NaN:NaN:",
},
{
// HumanizePercentage - model.SampleValue input.
text: "{{ -0.22222 | humanizePercentage }}:{{ 0.0 | humanizePercentage }}:{{ 0.1234567 | humanizePercentage }}:{{ 1.23456 | humanizePercentage }}",
output: "-22.22%:0%:12.35%:123.5%",
},
{
// HumanizeTimestamp - model.SampleValue input.
text: "{{ 1435065584.128 | humanizeTimestamp }}",