add process start time header to client_golang prometheus (#1278)
* add process start time header to client_golang prometheus Signed-off-by: Han Kang <hankang@google.com> * Apply suggestions from code review Co-authored-by: Bartlomiej Plotka <bwplotka@gmail.com> Signed-off-by: Han Kang <hankang@google.com> * fix up changes due to incorporation of feedback * fix lint issues --------- Signed-off-by: Han Kang <hankang@google.com> Co-authored-by: Bartlomiej Plotka <bwplotka@gmail.com>
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@ -37,6 +37,7 @@ import (
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"fmt"
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"io"
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"net/http"
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"strconv"
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"strings"
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"sync"
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"time"
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@ -47,9 +48,10 @@ import (
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)
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const (
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contentTypeHeader = "Content-Type"
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contentEncodingHeader = "Content-Encoding"
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acceptEncodingHeader = "Accept-Encoding"
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contentTypeHeader = "Content-Type"
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contentEncodingHeader = "Content-Encoding"
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acceptEncodingHeader = "Accept-Encoding"
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processStartTimeHeader = "Process-Start-Time-Unix"
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)
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var gzipPool = sync.Pool{
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@ -121,6 +123,9 @@ func HandlerForTransactional(reg prometheus.TransactionalGatherer, opts HandlerO
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}
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h := http.HandlerFunc(func(rsp http.ResponseWriter, req *http.Request) {
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if !opts.ProcessStartTime.IsZero() {
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rsp.Header().Set(processStartTimeHeader, strconv.FormatInt(opts.ProcessStartTime.Unix(), 10))
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}
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if inFlightSem != nil {
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select {
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case inFlightSem <- struct{}{}: // All good, carry on.
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@ -366,6 +371,14 @@ type HandlerOpts struct {
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// (which changes the identity of the resulting series on the Prometheus
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// server).
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EnableOpenMetrics bool
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// ProcessStartTime allows setting process start timevalue that will be exposed
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// with "Process-Start-Time-Unix" response header along with the metrics
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// payload. This allow callers to have efficient transformations to cumulative
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// counters (e.g. OpenTelemetry) or generally _created timestamp estimation per
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// scrape target.
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// NOTE: This feature is experimental and not covered by OpenMetrics or Prometheus
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// exposition format.
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ProcessStartTime time.Time
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}
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// gzipAccepted returns whether the client will accept gzip-encoded content.
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