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util/usermetric: add empty label helper

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Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>
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Kristoffer Dalby 2024-08-14 15:54:01 +02:00
parent 55d29a9c6d
commit fffc6a65b2
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1 changed files with 15 additions and 0 deletions
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15
util/usermetric/usermetric.go
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@ -33,6 +33,21 @@ func NewMultiLabelMap[T comparable](name string, promType, helpText string) *met
return m return m
} }
// NewMap creates and register a new
// Map variable with the given name and returns it.
//
// Note that usermetric are not protected against duplicate
// metrics name. It is the caller's responsibility to ensure that
// the name is unique.
func NewMap(name string, promType, helpText string) *metrics.MultiLabelMap[struct{}] {
m := &metrics.MultiLabelMap[struct{}]{
Type: promType,
Help: helpText,
}
vars.Set(name, m)
return m
}
// Handler returns a varz.Handler that serves the userfacing expvar contained // Handler returns a varz.Handler that serves the userfacing expvar contained
// in this package. // in this package.
func Handler(w http.ResponseWriter, r *http.Request) { func Handler(w http.ResponseWriter, r *http.Request) {