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docs: explain how to drop the client-controlled host label #7

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docs: explain how to drop the client-controlled host label #7

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8 changes: 8 additions & 0 deletions prometheus.go
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Expand Up @@ -53,6 +53,14 @@ type MiddlewareConfig struct {

// LabelFuncs allows adding custom labels in addition to default labels. When key has same name with default label
// it replaces default one.
//
// The default `host` label is taken from the request `Host` header, which the client controls. When the server is
// reachable without a proxy that only passes known hosts, every distinct value creates new metrics. To drop the
// label, return an empty value; Prometheus treats a label with an empty value as absent:
//
// LabelFuncs: map[string]echoprometheus.LabelValueFunc{
// "host": func(c *echo.Context, err error) string { return "" },
// }
LabelFuncs map[string]LabelValueFunc

// HistogramOptsFunc allows to change options for metrics of type histogram before metric is registered to Registerer
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