metrics

func Wrap ¶

func Wrap(h http.Handler) http.Handler

Wrap returns a handler which records the number of requests received and responses sent to the given handler, as well as latency quantiles for responses over a five-minute window.

These counters are published as the following metrics:

HTTP.Requests
HTTP.Responses
HTTP.Latency.{P50,P75,P90,P95,P99,P999}

By tracking incoming requests and outgoing responses, one can monitor not only the requests per second, but also the number of requests being processed at any given point in time.