mirror of https://github.com/k3s-io/k3s
68 lines
1.8 KiB
Go
68 lines
1.8 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package metrics
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import (
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"os"
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"time"
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"github.com/prometheus/procfs"
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"k8s.io/klog/v2"
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)
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var processStartTime = NewGaugeVec(
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&GaugeOpts{
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Name: "process_start_time_seconds",
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Help: "Start time of the process since unix epoch in seconds.",
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StabilityLevel: ALPHA,
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},
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[]string{},
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)
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// RegisterProcessStartTime registers the process_start_time_seconds to
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// a prometheus registry. This metric needs to be included to ensure counter
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// data fidelity.
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func RegisterProcessStartTime(registrationFunc func(Registerable) error) error {
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start, err := getProcessStart()
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if err != nil {
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klog.Errorf("Could not get process start time, %v", err)
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start = float64(time.Now().Unix())
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}
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// processStartTime is a lazy metric which only get initialized after registered.
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// so we have to explicitly create it before setting the label value. Otherwise
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// it is a noop.
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if !processStartTime.IsCreated() {
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processStartTime.initializeMetric()
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}
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processStartTime.WithLabelValues().Set(start)
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return registrationFunc(processStartTime)
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}
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func getProcessStart() (float64, error) {
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pid := os.Getpid()
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p, err := procfs.NewProc(pid)
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if err != nil {
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return 0, err
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}
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if stat, err := p.Stat(); err == nil {
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return stat.StartTime()
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}
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return 0, err
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}
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