prometheus/promhttp: actually observe values in trace in example
This is similar to https://github.com/prometheus/client_golang/pull/535 fixing ExampleInstrumentRoundTripperDuration. Signed-off-by: Sergiusz Urbaniak <sergiusz.urbaniak@gmail.com>
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@ -162,16 +162,16 @@ func ExampleInstrumentRoundTripperDuration() {
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// functions that we want to instrument.
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trace := &InstrumentTrace{
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DNSStart: func(t float64) {
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dnsLatencyVec.WithLabelValues("dns_start")
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dnsLatencyVec.WithLabelValues("dns_start").Observe(t)
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},
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DNSDone: func(t float64) {
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dnsLatencyVec.WithLabelValues("dns_done")
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dnsLatencyVec.WithLabelValues("dns_done").Observe(t)
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},
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TLSHandshakeStart: func(t float64) {
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tlsLatencyVec.WithLabelValues("tls_handshake_start")
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tlsLatencyVec.WithLabelValues("tls_handshake_start").Observe(t)
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},
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TLSHandshakeDone: func(t float64) {
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tlsLatencyVec.WithLabelValues("tls_handshake_done")
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tlsLatencyVec.WithLabelValues("tls_handshake_done").Observe(t)
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},
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}
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