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Important: This documentation is about an older version. It's relevant only to the release noted, many of the features and functions have been updated or replaced. Please view the current version.

Enterprise Open source

Template Functions

Template functions allow you to process alert evaluation results to generate dynamic notifications.

NameArgument typeReturn typeDescription
humanizenumber or stringstringConverts a number to a more readable format, using metric prefixes.
humanize1024number or stringstringLike humanize, but uses 1024 as the base rather than 1000.
humanizeDurationnumber or stringstringConverts a duration in seconds to a more readable format.
humanizePercentagenumber or stringstringConverts a ratio value to a fraction of 100.
humanizeTimestampnumber or stringstringConverts a Unix timestamp in seconds to a more readable format.
titlestringstringstrings.Title, capitalises first character of each word.
toUpperstringstringstrings.ToUpper, converts all characters to upper case.
toLowerstringstringstrings.ToLower, converts all characters to lower case.
matchpattern, textbooleanregexp.MatchString Tests for a unanchored regexp match.
reReplaceAllpattern, replacement, textstringRegexp.ReplaceAllString Regexp substitution, unanchored.
graphLinkstring - JSON Object with "expr" and "datasource" fieldsstringReturns the path to graphical view in Explore for the given expression and data source.
tableLinkstring- JSON Object with "expr" and "datasource" fieldsstringReturns the path to tabular view in Explore for the given expression and data source.
args[]interface{}map[string]interface{}Converts a list of objects to a map with keys, for example, arg0, arg1. Use this function to pass multiple arguments to templates.
externalURLnothingstringReturns a string representing the external URL.
pathPrefixnothingstringReturns the path of the external URL.

Examples

humanize

Template string { humanize $value }

Input 1234567.0

Expected 1.235M

humanize1024

TemplateString { humanize1024 $value }

Input 1048576.0

Expected 1Mi

humanizeDuration

TemplateString { humanizeDuration $value }

Input 899.99

Expected 14m 59s

humanizePercentage

TemplateString { humanizePercentage $value }

Input 0.1234567

Expected 12.35%

humanizeTimestamp

TemplateString { $value | humanizeTimestamp }

Input 1435065584.128

Expected 2015-06-23 13:19:44.128 +0000 UTC

title

TemplateString { $value | title }

Input aa bb CC

Expected Aa Bb Cc

toUpper

TemplateString { $value | toUpper }

Input aa bb CC

Expected AA BB CC

toLower

TemplateString { $value | toLower }

Input aA bB CC

Expected aa bb cc

match

TemplateString { match "a+" $labels.instance }

Input aa

Expected true

reReplaceAll

TemplateString {{ reReplaceAll "localhost:(.*)" "my.domain:$1" $labels.instance }}

Input localhost:3000

Expected my.domain:3000

TemplateString {{ graphLink "{\"expr\": \"up\", \"datasource\": \"gdev-prometheus\"}" }}

Expected /explore?left=["now-1h","now","gdev-prometheus",{"datasource":"gdev-prometheus","expr":"up","instant":false,"range":true}]

TemplateString {{ tableLink "{\"expr\": \"up\", \"datasource\": \"gdev-prometheus\"}" }}

Expected /explore?left=["now-1h","now","gdev-prometheus",{"datasource":"gdev-prometheus","expr":"up","instant":true,"range":false}]

args

TemplateString {{define "x"}}{{.arg0}} {{.arg1}}{{end}}{{template "x" (args 1 "2")}}

Expected 1 2

externalURL

TemplateString { externalURL }

Expected http://localhost/path/prefix

pathPrefix

TemplateString { pathPrefix }

Expected /path/prefix