mirror of
https://github.com/prometheus/prometheus.git
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c10780c966
This commit adds telemetry for the Prometheus expression rule evaluator, which will enable meta-Prometheus monitoring of customers to ensure that no instance is falling behind in answering routine queries. A few other sundry simplifications are introduced, too.
111 lines
2.6 KiB
Go
111 lines
2.6 KiB
Go
// Copyright 2013 Prometheus Team
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package rules
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import (
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"github.com/prometheus/prometheus/config"
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"github.com/prometheus/prometheus/model"
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"github.com/prometheus/prometheus/storage/metric"
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"log"
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"sync"
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"time"
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)
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type Result struct {
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Err error // TODO propagate errors from rule evaluation.
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Samples model.Samples
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}
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type RuleManager interface {
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AddRulesFromConfig(config config.Config) error
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}
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type ruleManager struct {
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rules []Rule
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results chan *Result
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done chan bool
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interval time.Duration
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storage *metric.TieredStorage
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}
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func NewRuleManager(results chan *Result, interval time.Duration, storage *metric.TieredStorage) RuleManager {
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manager := &ruleManager{
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results: results,
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rules: []Rule{},
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done: make(chan bool),
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interval: interval,
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storage: storage,
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}
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// BUG(julius): Extract this so that the caller manages concurrency.
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go manager.run(results)
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return manager
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}
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func (m *ruleManager) run(results chan *Result) {
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ticker := time.NewTicker(m.interval)
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defer ticker.Stop()
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for {
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select {
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case <-ticker.C:
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start := time.Now()
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m.runIteration(results)
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evalDurations.Add(map[string]string{intervalKey: m.interval.String()}, float64(time.Since(start)/time.Millisecond))
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case <-m.done:
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log.Printf("RuleManager exiting...")
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break
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}
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}
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}
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func (m *ruleManager) Stop() {
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select {
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case m.done <- true:
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default:
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}
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}
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func (m *ruleManager) runIteration(results chan *Result) {
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now := time.Now()
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wg := sync.WaitGroup{}
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for _, rule := range m.rules {
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wg.Add(1)
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// BUG(julius): Look at fixing thundering herd.
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go func(rule Rule) {
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defer wg.Done()
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vector, err := rule.Eval(now, m.storage)
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samples := make(model.Samples, len(vector))
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copy(samples, vector)
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m.results <- &Result{
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Samples: samples,
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Err: err,
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}
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}(rule)
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}
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wg.Wait()
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}
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func (m *ruleManager) AddRulesFromConfig(config config.Config) error {
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for _, ruleFile := range config.Global.RuleFile {
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newRules, err := LoadRulesFromFile(ruleFile)
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if err != nil {
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return err
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}
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m.rules = append(m.rules, newRules...)
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}
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return nil
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}
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