Optinally print OM created lines (#1408)
Signed-off-by: Arthur Silva Sens <arthur.sens@coralogix.com> Co-authored-by: Arthur Silva Sens <arthur.sens@coralogix.com>
This commit is contained in:
parent
93c851f0b3
commit
284ca0ff58
|
@ -0,0 +1,60 @@
|
|||
// Copyright 2022 The Prometheus Authors
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
|
||||
// A simple example of how to exposed created timestamps in OpenMetrics format.
|
||||
|
||||
package main
|
||||
|
||||
import (
|
||||
"log"
|
||||
"net/http"
|
||||
"time"
|
||||
|
||||
"github.com/prometheus/client_golang/prometheus"
|
||||
"github.com/prometheus/client_golang/prometheus/promhttp"
|
||||
)
|
||||
|
||||
func main() {
|
||||
requestDurations := prometheus.NewHistogram(prometheus.HistogramOpts{
|
||||
Name: "http_request_duration_seconds",
|
||||
Help: "A histogram of the HTTP request durations in seconds.",
|
||||
Buckets: prometheus.ExponentialBuckets(0.1, 1.5, 5),
|
||||
})
|
||||
|
||||
// Create non-global registry.
|
||||
registry := prometheus.NewRegistry()
|
||||
registry.MustRegister(
|
||||
requestDurations,
|
||||
)
|
||||
|
||||
go func() {
|
||||
for {
|
||||
// Record fictional latency.
|
||||
now := time.Now()
|
||||
requestDurations.Observe(time.Since(now).Seconds())
|
||||
time.Sleep(600 * time.Millisecond)
|
||||
}
|
||||
}()
|
||||
|
||||
// Expose /metrics HTTP endpoint using the created custom registry.
|
||||
http.Handle(
|
||||
"/metrics", promhttp.HandlerFor(
|
||||
registry,
|
||||
promhttp.HandlerOpts{
|
||||
EnableOpenMetrics: true,
|
||||
EnableOpenMetricsTextCreatedSamples: true,
|
||||
}),
|
||||
)
|
||||
// To test: curl -H 'Accept: application/openmetrics-text' localhost:8080/metrics
|
||||
log.Fatalln(http.ListenAndServe(":8080", nil))
|
||||
}
|
|
@ -207,7 +207,13 @@ func HandlerForTransactional(reg prometheus.TransactionalGatherer, opts HandlerO
|
|||
if encodingHeader != string(Identity) {
|
||||
rsp.Header().Set(contentEncodingHeader, encodingHeader)
|
||||
}
|
||||
enc := expfmt.NewEncoder(w, contentType)
|
||||
|
||||
var enc expfmt.Encoder
|
||||
if opts.EnableOpenMetricsTextCreatedSamples {
|
||||
enc = expfmt.NewEncoder(w, contentType, expfmt.WithCreatedLines())
|
||||
} else {
|
||||
enc = expfmt.NewEncoder(w, contentType)
|
||||
}
|
||||
|
||||
// handleError handles the error according to opts.ErrorHandling
|
||||
// and returns true if we have to abort after the handling.
|
||||
|
@ -408,6 +414,21 @@ type HandlerOpts struct {
|
|||
// (which changes the identity of the resulting series on the Prometheus
|
||||
// server).
|
||||
EnableOpenMetrics bool
|
||||
// EnableOpenMetricsTextCreatedSamples specifies if this handler should add, extra, synthetic
|
||||
// Created Timestamps for counters, histograms and summaries, which for the current
|
||||
// version of OpenMetrics are defined as extra series with the same name and "_created"
|
||||
// suffix. See also the OpenMetrics specification for more details
|
||||
// https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#counter-1
|
||||
//
|
||||
// Created timestamps are used to improve the accuracy of reset detection,
|
||||
// but the way it's designed in OpenMetrics 1.0 it also dramatically increases cardinality
|
||||
// if the scraper does not handle those metrics correctly (converting to created timestamp
|
||||
// instead of leaving those series as-is). New OpenMetrics versions might improve
|
||||
// this situation.
|
||||
//
|
||||
// Prometheus introduced the feature flag 'created-timestamp-zero-ingestion'
|
||||
// in version 2.50.0 to handle this situation.
|
||||
EnableOpenMetricsTextCreatedSamples bool
|
||||
// ProcessStartTime allows setting process start timevalue that will be exposed
|
||||
// with "Process-Start-Time-Unix" response header along with the metrics
|
||||
// payload. This allow callers to have efficient transformations to cumulative
|
||||
|
|
Loading…
Reference in New Issue