mirror of https://github.com/k3s-io/k3s
106 lines
2.6 KiB
Go
106 lines
2.6 KiB
Go
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/*
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Copyright 2014 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 gce
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import (
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"time"
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"github.com/prometheus/client_golang/prometheus"
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)
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const (
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// Version strings for recording metrics.
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computeV1Version = "v1"
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computeAlphaVersion = "alpha"
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computeBetaVersion = "beta"
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)
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type apiCallMetrics struct {
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latency *prometheus.HistogramVec
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errors *prometheus.CounterVec
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}
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var (
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metricLabels = []string{
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"request", // API function that is begin invoked.
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"region", // region (optional).
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"zone", // zone (optional).
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"version", // API version.
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}
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apiMetrics = registerAPIMetrics(metricLabels...)
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)
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type metricContext struct {
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start time.Time
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// The cardinalities of attributes and metricLabels (defined above) must
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// match, or prometheus will panic.
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attributes []string
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}
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// Value for an unused label in the metric dimension.
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const unusedMetricLabel = "<n/a>"
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// Observe the result of a API call.
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func (mc *metricContext) Observe(err error) error {
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apiMetrics.latency.WithLabelValues(mc.attributes...).Observe(
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time.Since(mc.start).Seconds())
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if err != nil {
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apiMetrics.errors.WithLabelValues(mc.attributes...).Inc()
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}
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return err
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}
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func newGenericMetricContext(prefix, request, region, zone, version string) *metricContext {
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if len(zone) == 0 {
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zone = unusedMetricLabel
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}
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if len(region) == 0 {
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region = unusedMetricLabel
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}
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return &metricContext{
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start: time.Now(),
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attributes: []string{prefix + "_" + request, region, zone, version},
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}
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}
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// registerApiMetrics adds metrics definitions for a category of API calls.
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func registerAPIMetrics(attributes ...string) *apiCallMetrics {
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metrics := &apiCallMetrics{
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latency: prometheus.NewHistogramVec(
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prometheus.HistogramOpts{
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Name: "cloudprovider_gce_api_request_duration_seconds",
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Help: "Latency of a GCE API call",
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},
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attributes,
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),
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errors: prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Name: "cloudprovider_gce_api_request_errors",
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Help: "Number of errors for an API call",
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},
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attributes,
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),
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}
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prometheus.MustRegister(metrics.latency)
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prometheus.MustRegister(metrics.errors)
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return metrics
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}
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