mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-11-28 09:55:36 +01:00
313 lines
10 KiB
Go
313 lines
10 KiB
Go
package promscrape
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import (
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"flag"
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"fmt"
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"strings"
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"time"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promauth"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promrelabel"
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parser "github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/prometheus"
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"github.com/VictoriaMetrics/metrics"
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xxhash "github.com/cespare/xxhash/v2"
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)
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var (
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suppressScrapeErrors = flag.Bool("promscrape.suppressScrapeErrors", false, "Whether to suppress scrape errors logging. "+
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"The last error for each target is always available at '/targets' page even if scrape errors logging is suppressed")
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)
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// ScrapeWork represents a unit of work for scraping Prometheus metrics.
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type ScrapeWork struct {
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// Unique ID for the ScrapeWork.
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ID uint64
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// Full URL (including query args) for the scrape.
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ScrapeURL string
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// Interval for scraping the ScrapeURL.
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ScrapeInterval time.Duration
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// Timeout for scraping the ScrapeURL.
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ScrapeTimeout time.Duration
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// How to deal with conflicting labels.
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// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#scrape_config
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HonorLabels bool
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// How to deal with scraped timestamps.
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// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#scrape_config
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HonorTimestamps bool
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// Labels to add to the scraped metrics.
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//
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// The list contains at least the following labels according to https://prometheus.io/docs/prometheus/latest/configuration/configuration/#relabel_config
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//
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// * job
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// * __address__
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// * __scheme__
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// * __metrics_path__
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// * __param_<name>
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// * __meta_*
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// * user-defined labels set via `relabel_configs` section in `scrape_config`
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//
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// See also https://prometheus.io/docs/concepts/jobs_instances/
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Labels []prompbmarshal.Label
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// Auth config
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AuthConfig *promauth.Config
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// Optional `metric_relabel_configs`.
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MetricRelabelConfigs []promrelabel.ParsedRelabelConfig
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// The maximum number of metrics to scrape after relabeling.
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SampleLimit int
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// The original 'job_name'
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jobNameOriginal string
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}
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// key returns unique identifier for the given sw.
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//
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// it can be used for comparing for equality two ScrapeWork objects.
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func (sw *ScrapeWork) key() string {
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key := fmt.Sprintf("ScrapeURL=%s, ScrapeInterval=%s, ScrapeTimeout=%s, HonorLabels=%v, HonorTimestamps=%v, Labels=%s, "+
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"AuthConfig=%s, MetricRelabelConfigs=%s, SampleLimit=%d",
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sw.ScrapeURL, sw.ScrapeInterval, sw.ScrapeTimeout, sw.HonorLabels, sw.HonorTimestamps, sw.LabelsString(),
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sw.AuthConfig.String(), sw.metricRelabelConfigsString(), sw.SampleLimit)
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return key
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}
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func (sw *ScrapeWork) metricRelabelConfigsString() string {
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var sb strings.Builder
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for _, prc := range sw.MetricRelabelConfigs {
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fmt.Fprintf(&sb, "%s", prc.String())
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}
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return sb.String()
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}
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// Job returns job for the ScrapeWork
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func (sw *ScrapeWork) Job() string {
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return promrelabel.GetLabelValueByName(sw.Labels, "job")
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}
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// LabelsString returns labels in Prometheus format for the given sw.
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func (sw *ScrapeWork) LabelsString() string {
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labels := make([]string, 0, len(sw.Labels))
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for _, label := range promrelabel.FinalizeLabels(nil, sw.Labels) {
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labels = append(labels, fmt.Sprintf("%s=%q", label.Name, label.Value))
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}
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return "{" + strings.Join(labels, ", ") + "}"
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}
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type scrapeWork struct {
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// Config for the scrape.
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Config ScrapeWork
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// ReadData is called for reading the data.
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ReadData func(dst []byte) ([]byte, error)
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// PushData is called for pushing collected data.
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PushData func(wr *prompbmarshal.WriteRequest)
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bodyBuf []byte
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rows parser.Rows
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tmpRow parser.Row
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writeRequest prompbmarshal.WriteRequest
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labels []prompbmarshal.Label
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samples []prompbmarshal.Sample
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}
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func (sw *scrapeWork) run(stopCh <-chan struct{}) {
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// Calculate start time for the first scrape from ScrapeURL and labels.
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// This should spread load when scraping many targets with different
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// scrape urls and labels.
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// This also makes consistent scrape times across restarts
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// for a target with the same ScrapeURL and labels.
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scrapeInterval := sw.Config.ScrapeInterval
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key := fmt.Sprintf("ScrapeURL=%s, Labels=%s", sw.Config.ScrapeURL, sw.Config.LabelsString())
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h := uint32(xxhash.Sum64([]byte(key)))
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randSleep := uint64(float64(scrapeInterval) * (float64(h) / (1 << 32)))
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sleepOffset := uint64(time.Now().UnixNano()) % uint64(scrapeInterval)
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if randSleep < sleepOffset {
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randSleep += uint64(scrapeInterval)
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}
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randSleep -= sleepOffset
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timer := time.NewTimer(time.Duration(randSleep))
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var timestamp int64
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var ticker *time.Ticker
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select {
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case <-stopCh:
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timer.Stop()
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return
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case <-timer.C:
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ticker = time.NewTicker(scrapeInterval)
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timestamp = time.Now().UnixNano() / 1e6
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sw.scrapeAndLogError(timestamp)
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}
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defer ticker.Stop()
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for {
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timestamp += scrapeInterval.Milliseconds()
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select {
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case <-stopCh:
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return
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case <-ticker.C:
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t := time.Now().UnixNano() / 1e6
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if d := t - timestamp; d > 0 && float64(d)/float64(scrapeInterval.Milliseconds()) > 0.1 {
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// Too big jitter. Adjust timestamp
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timestamp = t
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}
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sw.scrapeAndLogError(timestamp)
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}
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}
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}
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func (sw *scrapeWork) logError(s string) {
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if !*suppressScrapeErrors {
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logger.ErrorfSkipframes(1, "error when scraping %q from job %q with labels %s: %s", sw.Config.ScrapeURL, sw.Config.Job(), sw.Config.LabelsString(), s)
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}
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}
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func (sw *scrapeWork) scrapeAndLogError(timestamp int64) {
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if err := sw.scrapeInternal(timestamp); err != nil && !*suppressScrapeErrors {
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logger.Errorf("error when scraping %q from job %q with labels %s: %s", sw.Config.ScrapeURL, sw.Config.Job(), sw.Config.LabelsString(), err)
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}
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}
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var (
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scrapeDuration = metrics.NewHistogram("vm_promscrape_scrape_duration_seconds")
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scrapeResponseSize = metrics.NewHistogram("vm_promscrape_scrape_response_size_bytes")
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scrapedSamples = metrics.NewHistogram("vm_promscrape_scraped_samples")
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scrapesSkippedBySampleLimit = metrics.NewCounter("vm_promscrape_scrapes_skipped_by_sample_limit_total")
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scrapesFailed = metrics.NewCounter("vm_promscrape_scrapes_failed_total")
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pushDataDuration = metrics.NewHistogram("vm_promscrape_push_data_duration_seconds")
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)
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func (sw *scrapeWork) scrapeInternal(timestamp int64) error {
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var err error
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sw.bodyBuf, err = sw.ReadData(sw.bodyBuf[:0])
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endTimestamp := time.Now().UnixNano() / 1e6
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duration := float64(endTimestamp-timestamp) / 1e3
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scrapeDuration.Update(duration)
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scrapeResponseSize.Update(float64(len(sw.bodyBuf)))
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up := 1
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if err != nil {
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up = 0
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scrapesFailed.Inc()
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} else {
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bodyString := bytesutil.ToUnsafeString(sw.bodyBuf)
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sw.rows.UnmarshalWithErrLogger(bodyString, sw.logError)
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}
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srcRows := sw.rows.Rows
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samplesScraped := len(srcRows)
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scrapedSamples.Update(float64(samplesScraped))
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for i := range srcRows {
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sw.addRowToTimeseries(&srcRows[i], timestamp)
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}
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sw.rows.Reset()
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if sw.Config.SampleLimit > 0 && len(sw.writeRequest.Timeseries) > sw.Config.SampleLimit {
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prompbmarshal.ResetWriteRequest(&sw.writeRequest)
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up = 0
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scrapesSkippedBySampleLimit.Inc()
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}
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samplesPostRelabeling := len(sw.writeRequest.Timeseries)
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sw.addAutoTimeseries("up", float64(up), timestamp)
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sw.addAutoTimeseries("scrape_duration_seconds", duration, timestamp)
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sw.addAutoTimeseries("scrape_samples_scraped", float64(samplesScraped), timestamp)
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sw.addAutoTimeseries("scrape_samples_post_metric_relabeling", float64(samplesPostRelabeling), timestamp)
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startTime := time.Now()
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sw.PushData(&sw.writeRequest)
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pushDataDuration.UpdateDuration(startTime)
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prompbmarshal.ResetWriteRequest(&sw.writeRequest)
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sw.labels = sw.labels[:0]
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sw.samples = sw.samples[:0]
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tsmGlobal.Update(&sw.Config, up == 1, timestamp, int64(duration*1000), err)
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return err
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}
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// addAutoTimeseries adds automatically generated time series with the given name, value and timestamp.
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//
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// See https://prometheus.io/docs/concepts/jobs_instances/#automatically-generated-labels-and-time-series
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func (sw *scrapeWork) addAutoTimeseries(name string, value float64, timestamp int64) {
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sw.tmpRow.Metric = name
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sw.tmpRow.Tags = nil
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sw.tmpRow.Value = value
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sw.tmpRow.Timestamp = timestamp
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sw.addRowToTimeseries(&sw.tmpRow, timestamp)
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}
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func (sw *scrapeWork) addRowToTimeseries(r *parser.Row, timestamp int64) {
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labelsLen := len(sw.labels)
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sw.labels = appendLabels(sw.labels, r.Metric, r.Tags, sw.Config.Labels, sw.Config.HonorLabels)
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sw.labels = promrelabel.ApplyRelabelConfigs(sw.labels, labelsLen, sw.Config.MetricRelabelConfigs, true)
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if len(sw.labels) == labelsLen {
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// Skip row without labels.
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return
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}
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labels := sw.labels[labelsLen:]
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sw.samples = append(sw.samples, prompbmarshal.Sample{})
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sample := &sw.samples[len(sw.samples)-1]
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sample.Value = r.Value
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sample.Timestamp = r.Timestamp
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if !sw.Config.HonorTimestamps || sample.Timestamp == 0 {
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sample.Timestamp = timestamp
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}
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wr := &sw.writeRequest
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wr.Timeseries = append(wr.Timeseries, prompbmarshal.TimeSeries{})
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ts := &wr.Timeseries[len(wr.Timeseries)-1]
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ts.Labels = labels
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ts.Samples = sw.samples[len(sw.samples)-1:]
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}
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func appendLabels(dst []prompbmarshal.Label, metric string, src []parser.Tag, extraLabels []prompbmarshal.Label, honorLabels bool) []prompbmarshal.Label {
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dstLen := len(dst)
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dst = append(dst, prompbmarshal.Label{
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Name: "__name__",
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Value: metric,
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})
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for i := range src {
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tag := &src[i]
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dst = append(dst, prompbmarshal.Label{
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Name: tag.Key,
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Value: tag.Value,
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})
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}
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dst = append(dst, extraLabels...)
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labels := dst[dstLen:]
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if len(labels) <= 1 {
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// Fast path - only a single label.
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return dst
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}
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// de-duplicate labels
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dstLabels := labels[:0]
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for i := range labels {
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label := &labels[i]
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prevLabel := promrelabel.GetLabelByName(dstLabels, label.Name)
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if prevLabel == nil {
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dstLabels = append(dstLabels, *label)
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continue
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}
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if honorLabels {
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// Skip the extra label with the same name.
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continue
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}
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// Rename the prevLabel to "exported_" + label.Name.
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// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#scrape_config
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exportedName := "exported_" + label.Name
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if promrelabel.GetLabelByName(dstLabels, exportedName) != nil {
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// Override duplicate with the current label.
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*prevLabel = *label
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continue
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}
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prevLabel.Name = exportedName
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dstLabels = append(dstLabels, *label)
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}
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return dst[:dstLen+len(dstLabels)]
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}
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