mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-05 01:01:09 +01:00
263 lines
8.3 KiB
Go
263 lines
8.3 KiB
Go
package promscrape
|
|
|
|
import (
|
|
"crypto/tls"
|
|
"crypto/x509"
|
|
"math/rand"
|
|
"time"
|
|
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
|
|
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promrelabel"
|
|
parser "github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/prometheus"
|
|
"github.com/VictoriaMetrics/metrics"
|
|
)
|
|
|
|
// ScrapeWork represents a unit of work for scraping Prometheus metrics.
|
|
type ScrapeWork struct {
|
|
// Full URL (including query args) for the scrape.
|
|
ScrapeURL string
|
|
|
|
// Interval for scraping the ScrapeURL.
|
|
ScrapeInterval time.Duration
|
|
|
|
// Timeout for scraping the ScrapeURL.
|
|
ScrapeTimeout time.Duration
|
|
|
|
// How to deal with conflicting labels.
|
|
// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#scrape_config
|
|
HonorLabels bool
|
|
|
|
// How to deal with scraped timestamps.
|
|
// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#scrape_config
|
|
HonorTimestamps bool
|
|
|
|
// Labels to add to the scraped metrics.
|
|
//
|
|
// The list contains at least the following labels according to https://prometheus.io/docs/prometheus/latest/configuration/configuration/#relabel_config
|
|
//
|
|
// * job
|
|
// * __address__
|
|
// * __scheme__
|
|
// * __metrics_path__
|
|
// * __param_<name>
|
|
// * __meta_*
|
|
// * user-defined labels set via `relabel_configs` section in `scrape_config`
|
|
//
|
|
// See also https://prometheus.io/docs/concepts/jobs_instances/
|
|
Labels []prompbmarshal.Label
|
|
|
|
// Optional `Authorization` header.
|
|
//
|
|
// It may contain `Basic ....` or `Bearer ....` string.
|
|
Authorization string
|
|
|
|
// Optional TLS config
|
|
TLSRootCA *x509.CertPool
|
|
TLSCertificate *tls.Certificate
|
|
TLSServerName string
|
|
TLSInsecureSkipVerify bool
|
|
|
|
// Optional `metric_relabel_configs`.
|
|
MetricRelabelConfigs []promrelabel.ParsedRelabelConfig
|
|
|
|
// The maximum number of metrics to scrape after relabeling.
|
|
ScrapeLimit int
|
|
}
|
|
|
|
type scrapeWork struct {
|
|
// Config for the scrape.
|
|
Config ScrapeWork
|
|
|
|
// ReadData is called for reading the data.
|
|
ReadData func(dst []byte) ([]byte, error)
|
|
|
|
// PushData is called for pushing collected data.
|
|
PushData func(wr *prompbmarshal.WriteRequest)
|
|
|
|
bodyBuf []byte
|
|
rows parser.Rows
|
|
tmpRow parser.Row
|
|
|
|
writeRequest prompbmarshal.WriteRequest
|
|
labels []prompbmarshal.Label
|
|
samples []prompbmarshal.Sample
|
|
}
|
|
|
|
func (sw *scrapeWork) run(stopCh <-chan struct{}) {
|
|
// Randomize start time for the first scrape in order to spread load
|
|
// when scraping many targets.
|
|
scrapeInterval := sw.Config.ScrapeInterval
|
|
randSleep := time.Duration(float64(scrapeInterval) * rand.Float64())
|
|
timer := time.NewTimer(randSleep)
|
|
var timestamp int64
|
|
var ticker *time.Ticker
|
|
select {
|
|
case <-stopCh:
|
|
timer.Stop()
|
|
return
|
|
case <-timer.C:
|
|
ticker = time.NewTicker(scrapeInterval)
|
|
timestamp = time.Now().UnixNano() / 1e6
|
|
sw.scrapeAndLogError(timestamp)
|
|
}
|
|
defer ticker.Stop()
|
|
for {
|
|
timestamp += scrapeInterval.Milliseconds()
|
|
select {
|
|
case <-stopCh:
|
|
return
|
|
case <-ticker.C:
|
|
t := time.Now().UnixNano() / 1e6
|
|
if d := t - timestamp; d > 0 && float64(d)/float64(scrapeInterval.Milliseconds()) > 0.1 {
|
|
// Too big jitter. Adjust timestamp
|
|
timestamp = t
|
|
}
|
|
sw.scrapeAndLogError(timestamp)
|
|
}
|
|
}
|
|
}
|
|
|
|
func (sw *scrapeWork) logError(s string) {
|
|
logger.ErrorfSkipframes(1, "error when scraping %q: %s", sw.Config.ScrapeURL, s)
|
|
}
|
|
|
|
func (sw *scrapeWork) scrapeAndLogError(timestamp int64) {
|
|
if err := sw.scrapeInternal(timestamp); err != nil {
|
|
logger.Errorf("error when scraping %q: %s", sw.Config.ScrapeURL, err)
|
|
}
|
|
}
|
|
|
|
var (
|
|
scrapeDuration = metrics.NewHistogram("vm_promscrape_scrape_duration_seconds")
|
|
scrapeResponseSize = metrics.NewHistogram("vm_promscrape_scrape_response_size_bytes")
|
|
scrapedSamples = metrics.NewHistogram("vm_promscrape_scraped_samples")
|
|
scrapesSkippedByScrapeLimit = metrics.NewCounter("vm_promscrape_scrapes_skipped_by_scrape_limit_total")
|
|
scrapesFailed = metrics.NewCounter("vm_promscrape_scrapes_failed_total")
|
|
pushDataDuration = metrics.NewHistogram("vm_promscrape_push_data_duration_seconds")
|
|
)
|
|
|
|
func (sw *scrapeWork) scrapeInternal(timestamp int64) error {
|
|
var err error
|
|
sw.bodyBuf, err = sw.ReadData(sw.bodyBuf[:0])
|
|
endTimestamp := time.Now().UnixNano() / 1e6
|
|
duration := float64(endTimestamp-timestamp) / 1e3
|
|
scrapeDuration.Update(duration)
|
|
scrapeResponseSize.Update(float64(len(sw.bodyBuf)))
|
|
up := 1
|
|
if err != nil {
|
|
up = 0
|
|
scrapesFailed.Inc()
|
|
} else {
|
|
bodyString := bytesutil.ToUnsafeString(sw.bodyBuf)
|
|
sw.rows.UnmarshalWithErrLogger(bodyString, sw.logError)
|
|
}
|
|
srcRows := sw.rows.Rows
|
|
samplesScraped := len(srcRows)
|
|
scrapedSamples.Update(float64(samplesScraped))
|
|
for i := range srcRows {
|
|
sw.addRowToTimeseries(&srcRows[i], timestamp)
|
|
}
|
|
sw.rows.Reset()
|
|
if sw.Config.ScrapeLimit > 0 && len(sw.writeRequest.Timeseries) > sw.Config.ScrapeLimit {
|
|
prompbmarshal.ResetWriteRequest(&sw.writeRequest)
|
|
up = 0
|
|
scrapesSkippedByScrapeLimit.Inc()
|
|
}
|
|
samplesPostRelabeling := len(sw.writeRequest.Timeseries)
|
|
sw.addAutoTimeseries("up", float64(up), timestamp)
|
|
sw.addAutoTimeseries("scrape_duration_seconds", duration, timestamp)
|
|
sw.addAutoTimeseries("scrape_samples_scraped", float64(samplesScraped), timestamp)
|
|
sw.addAutoTimeseries("scrape_samples_post_metric_relabeling", float64(samplesPostRelabeling), timestamp)
|
|
startTime := time.Now()
|
|
sw.PushData(&sw.writeRequest)
|
|
pushDataDuration.UpdateDuration(startTime)
|
|
prompbmarshal.ResetWriteRequest(&sw.writeRequest)
|
|
sw.labels = sw.labels[:0]
|
|
sw.samples = sw.samples[:0]
|
|
tsmGlobal.Update(&sw.Config, up == 1, timestamp, int64(duration*1000), err)
|
|
return err
|
|
}
|
|
|
|
// addAutoTimeseries adds automatically generated time series with the given name, value and timestamp.
|
|
//
|
|
// See https://prometheus.io/docs/concepts/jobs_instances/#automatically-generated-labels-and-time-series
|
|
func (sw *scrapeWork) addAutoTimeseries(name string, value float64, timestamp int64) {
|
|
sw.tmpRow.Metric = name
|
|
sw.tmpRow.Tags = nil
|
|
sw.tmpRow.Value = value
|
|
sw.tmpRow.Timestamp = timestamp
|
|
sw.addRowToTimeseries(&sw.tmpRow, timestamp)
|
|
}
|
|
|
|
func (sw *scrapeWork) addRowToTimeseries(r *parser.Row, timestamp int64) {
|
|
labelsLen := len(sw.labels)
|
|
sw.labels = appendLabels(sw.labels, r.Metric, r.Tags, sw.Config.Labels, sw.Config.HonorLabels)
|
|
sw.labels = promrelabel.ApplyRelabelConfigs(sw.labels, labelsLen, sw.Config.MetricRelabelConfigs, true)
|
|
if len(sw.labels) == labelsLen {
|
|
// Skip row without labels.
|
|
return
|
|
}
|
|
labels := sw.labels[labelsLen:]
|
|
sw.samples = append(sw.samples, prompbmarshal.Sample{})
|
|
sample := &sw.samples[len(sw.samples)-1]
|
|
sample.Value = r.Value
|
|
sample.Timestamp = r.Timestamp
|
|
if !sw.Config.HonorTimestamps || sample.Timestamp == 0 {
|
|
sample.Timestamp = timestamp
|
|
}
|
|
wr := &sw.writeRequest
|
|
wr.Timeseries = append(wr.Timeseries, prompbmarshal.TimeSeries{})
|
|
ts := &wr.Timeseries[len(wr.Timeseries)-1]
|
|
ts.Labels = labels
|
|
ts.Samples = sw.samples[len(sw.samples)-1:]
|
|
}
|
|
|
|
func appendLabels(dst []prompbmarshal.Label, metric string, src []parser.Tag, extraLabels []prompbmarshal.Label, honorLabels bool) []prompbmarshal.Label {
|
|
dstLen := len(dst)
|
|
dst = append(dst, prompbmarshal.Label{
|
|
Name: "__name__",
|
|
Value: metric,
|
|
})
|
|
for i := range src {
|
|
tag := &src[i]
|
|
dst = append(dst, prompbmarshal.Label{
|
|
Name: tag.Key,
|
|
Value: tag.Value,
|
|
})
|
|
}
|
|
dst = append(dst, extraLabels...)
|
|
labels := dst[dstLen:]
|
|
if len(labels) <= 1 {
|
|
// Fast path - only a single label.
|
|
return dst
|
|
}
|
|
|
|
// de-duplicate labels
|
|
dstLabels := labels[:0]
|
|
for i := range labels {
|
|
label := &labels[i]
|
|
prevLabel := promrelabel.GetLabelByName(dstLabels, label.Name)
|
|
if prevLabel == nil {
|
|
dstLabels = append(dstLabels, *label)
|
|
continue
|
|
}
|
|
if honorLabels {
|
|
// Skip the extra label with the same name.
|
|
continue
|
|
}
|
|
// Rename the prevLabel to "exported_" + label.Name.
|
|
// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#scrape_config
|
|
exportedName := "exported_" + label.Name
|
|
if promrelabel.GetLabelByName(dstLabels, exportedName) != nil {
|
|
// Override duplicate with the current label.
|
|
*prevLabel = *label
|
|
continue
|
|
}
|
|
prevLabel.Name = exportedName
|
|
dstLabels = append(dstLabels, *label)
|
|
}
|
|
return dst[:dstLen+len(dstLabels)]
|
|
}
|