mirror of
https://github.com/prometheus/statsd_exporter.git
synced 2024-11-10 17:31:07 +00:00
TTL expiration tests, README update
Signed-off-by: Ivan Mikheykin <ivan.mikheykin@flant.com>
This commit is contained in:
parent
57495db281
commit
d1b2dd47a8
6 changed files with 302 additions and 16 deletions
13
README.md
13
README.md
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@ -268,6 +268,7 @@ defaults:
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buckets: [.005, .01, .025, .05, .1, .25, .5, 1, 2.5 ]
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buckets: [.005, .01, .025, .05, .1, .25, .5, 1, 2.5 ]
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match_type: glob
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match_type: glob
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glob_disable_ordering: false
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glob_disable_ordering: false
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ttl: 0 # metrics not expired
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mappings:
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mappings:
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# This will be a histogram using the buckets set in `defaults`.
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# This will be a histogram using the buckets set in `defaults`.
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- match: test.timing.*.*.*
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- match: test.timing.*.*.*
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@ -350,6 +351,18 @@ mappings:
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Possible values for `match_metric_type` are `gauge`, `counter` and `timer`.
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Possible values for `match_metric_type` are `gauge`, `counter` and `timer`.
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### Time series expiration
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`ttl` parameter can be used to define expiration time for stale metrics.
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Value is a time duration with valid time units: "ns", "us" (or "µs"),
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"ms", "s", "m", "h". For example, `ttl: 1m20s`. `0` value is used to indicate
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not expired metrics.
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Expiration is useful to gather metrics with changing label values from
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dynamic environments like Kubernetes. For example, metric
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`ingress_nginx_upstream_retries_count` with label `pod` and
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changing pod name as a value for this label.
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## Using Docker
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## Using Docker
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You can deploy this exporter using the [prom/statsd-exporter](https://registry.hub.docker.com/u/prom/statsd-exporter/) Docker image.
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You can deploy this exporter using the [prom/statsd-exporter](https://registry.hub.docker.com/u/prom/statsd-exporter/) Docker image.
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@ -265,7 +265,7 @@ type Events []Event
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type LabelValues struct {
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type LabelValues struct {
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lastRegisteredAt time.Time
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lastRegisteredAt time.Time
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labels prometheus.Labels
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labels prometheus.Labels
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ttl uint64
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ttl time.Duration
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}
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}
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type Exporter struct {
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type Exporter struct {
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@ -315,6 +315,9 @@ func (b *Exporter) handleEvent(event Event) {
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mapping, labels, present := b.mapper.GetMapping(event.MetricName(), event.MetricType())
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mapping, labels, present := b.mapper.GetMapping(event.MetricName(), event.MetricType())
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if mapping == nil {
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if mapping == nil {
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mapping = &mapper.MetricMapping{}
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mapping = &mapper.MetricMapping{}
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if b.mapper.Defaults.Ttl != 0 {
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mapping.Ttl = b.mapper.Defaults.Ttl
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}
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}
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}
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if mapping.Action == mapper.ActionTypeDrop {
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if mapping.Action == mapper.ActionTypeDrop {
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@ -443,7 +446,7 @@ func (b *Exporter) removeStaleMetrics() {
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if lvs.ttl == 0 {
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if lvs.ttl == 0 {
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continue
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continue
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}
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}
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if lvs.lastRegisteredAt.Add(time.Duration(lvs.ttl) * time.Second).Before(now) {
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if lvs.lastRegisteredAt.Add(lvs.ttl).Before(now) {
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b.Counters.Delete(metricName, lvs.labels)
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b.Counters.Delete(metricName, lvs.labels)
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b.Gauges.Delete(metricName, lvs.labels)
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b.Gauges.Delete(metricName, lvs.labels)
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b.Summaries.Delete(metricName, lvs.labels)
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b.Summaries.Delete(metricName, lvs.labels)
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@ -455,7 +458,7 @@ func (b *Exporter) removeStaleMetrics() {
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}
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}
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// saveLabelValues stores label values set to labelValues and update lastRegisteredAt time
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// saveLabelValues stores label values set to labelValues and update lastRegisteredAt time
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func (b *Exporter) saveLabelValues(metricName string, labels prometheus.Labels, ttl uint64) {
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func (b *Exporter) saveLabelValues(metricName string, labels prometheus.Labels, ttl time.Duration) {
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_, hasMetric := b.labelValues[metricName]
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_, hasMetric := b.labelValues[metricName]
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if !hasMetric {
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if !hasMetric {
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b.labelValues[metricName] = make(map[uint64]*LabelValues)
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b.labelValues[metricName] = make(map[uint64]*LabelValues)
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225
exporter_test.go
225
exporter_test.go
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@ -100,20 +100,15 @@ func TestHistogramUnits(t *testing.T) {
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ex.Listen(events)
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ex.Listen(events)
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histogram, err := ex.Histograms.Get(name, prometheus.Labels{}, "", nil)
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metrics, err := prometheus.DefaultGatherer.Gather()
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if err != nil {
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if err != nil {
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t.Fatalf("Histogram not registered")
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t.Fatalf("Cannot gather from DefaultGatherer: %v", err)
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}
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}
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value := getFloat64(metrics, name, prometheus.Labels{})
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// check the state of the histogram by
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if *value == 300 {
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// (ab)using its Write method (which is usually only used by Prometheus internally).
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metric := &dto.Metric{}
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histogram.Write(metric)
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value := *metric.Histogram.SampleSum
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if value == 300 {
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t.Fatalf("Histogram observations not scaled into Seconds")
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t.Fatalf("Histogram observations not scaled into Seconds")
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} else if value != .300 {
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} else if *value != .300 {
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t.Fatalf("Received unexpected value for histogram observation %f != .300", value)
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t.Fatalf("Received unexpected value for histogram observation %f != .300", *value)
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}
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}
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}
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}
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@ -173,3 +168,211 @@ func TestEscapeMetricName(t *testing.T) {
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}
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}
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}
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}
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}
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}
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// TestTtlExpiration validates expiration of time series.
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// foobar metric without mapping should expire with default ttl of 1s
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// bazqux metric should expire with ttl of 2s
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func TestTtlExpiration(t *testing.T) {
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config := `
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defaults:
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ttl: 1s
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mappings:
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- match: bazqux.*
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name: bazqux
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labels:
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first: baz
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second: qux
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third: $1
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ttl: 2s
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`
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bazquxLabels := prometheus.Labels{
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"third": "main",
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"first": "baz",
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"second": "qux",
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}
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testMapper := &mapper.MetricMapper{}
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err := testMapper.InitFromYAMLString(config)
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if err != nil {
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t.Fatalf("Config load error: %s %s", config, err)
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}
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ex := NewExporter(testMapper)
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for _, l := range []statsDPacketHandler{&StatsDUDPListener{}, &mockStatsDTCPListener{}} {
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events := make(chan Events, 2)
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fatal := make(chan error, 1) // t.Fatal must not be called in goroutines (SA2002)
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stop := make(chan bool, 1)
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l.handlePacket([]byte("foobar:200|g"), events)
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l.handlePacket([]byte("bazqux.main:42|ms"), events)
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// Close channel to signify we are done with the listener after a short period.
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go func() {
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defer close(events)
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time.Sleep(time.Millisecond * 100)
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var metrics []*dto.MetricFamily
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var foobarValue *float64
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var bazquxValue *float64
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// Wait to gather both metrics
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var tries = 7
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for {
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metrics, err = prometheus.DefaultGatherer.Gather()
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foobarValue = getFloat64(metrics, "foobar", prometheus.Labels{})
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bazquxValue = getFloat64(metrics, "bazqux", bazquxLabels)
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if foobarValue != nil && bazquxValue != nil {
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break
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}
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tries--
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if tries == 0 {
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fatal <- fmt.Errorf("Gauge `foobar` and Summary `bazqux` should be gathered")
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return
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}
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time.Sleep(time.Millisecond * 100)
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}
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// Check values
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if *foobarValue != 200 {
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fatal <- fmt.Errorf("Gauge `foobar` observation %f is not expected. Should be 200", *foobarValue)
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return
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}
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if *bazquxValue != 42 {
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fatal <- fmt.Errorf("Summary `bazqux` observation %f is not expected. Should be 42", *bazquxValue)
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return
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}
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// Wait for expiration of foobar
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tries = 20 // 20*100 = 2s
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for {
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time.Sleep(time.Millisecond * 100)
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metrics, err = prometheus.DefaultGatherer.Gather()
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foobarValue = getFloat64(metrics, "foobar", prometheus.Labels{})
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bazquxValue = getFloat64(metrics, "bazqux", bazquxLabels)
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if foobarValue == nil {
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break
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}
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tries--
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if tries == 0 {
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fatal <- fmt.Errorf("Gauge `foobar` should be expired")
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return
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}
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}
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if *bazquxValue != 42 {
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fatal <- fmt.Errorf("Summary `bazqux` observation %f is not expected. Should be 42", *bazquxValue)
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return
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}
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// Wait for expiration of bazqux
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tries = 20 // 20*100 = 2s
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for {
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time.Sleep(time.Millisecond * 100)
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metrics, err = prometheus.DefaultGatherer.Gather()
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foobarValue = getFloat64(metrics, "foobar", prometheus.Labels{})
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bazquxValue = getFloat64(metrics, "bazqux", bazquxLabels)
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if bazquxValue == nil {
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break
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}
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if foobarValue != nil {
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fatal <- fmt.Errorf("Gauge `foobar` should not be gathered after expiration")
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return
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}
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tries--
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if tries == 0 {
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fatal <- fmt.Errorf("Summary `bazqux` should be expired")
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return
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}
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}
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}()
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go func() {
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ex.Listen(events)
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stop <- true
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}()
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for {
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select {
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case err := <-fatal:
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t.Fatalf("%v", err)
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case <-stop:
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return
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}
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}
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}
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}
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// getFloat64 search for metric by name in array of MetricFamily and then search a value by labels.
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// Method returns a value or nil if metric is not found.
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func getFloat64(metrics []*dto.MetricFamily, name string, labels prometheus.Labels) *float64 {
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var metricFamily *dto.MetricFamily
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for _, m := range metrics {
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if *m.Name == name {
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metricFamily = m
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break
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}
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}
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if metricFamily == nil {
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return nil
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}
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var metric *dto.Metric
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labelsHash := hashNameAndLabels(name, labels)
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for _, m := range metricFamily.Metric {
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h := hashNameAndLabels(name, labelPairsAsLabels(m.GetLabel()))
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if h == labelsHash {
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metric = m
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break
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}
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}
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if metric == nil {
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return nil
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}
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var value float64
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if metric.Gauge != nil {
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value = metric.Gauge.GetValue()
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return &value
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}
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if metric.Counter != nil {
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value = metric.Counter.GetValue()
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return &value
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}
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if metric.Histogram != nil {
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value = metric.Histogram.GetSampleSum()
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return &value
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}
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if metric.Summary != nil {
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value = metric.Summary.GetSampleSum()
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return &value
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}
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if metric.Untyped != nil {
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value = metric.Untyped.GetValue()
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return &value
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}
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panic(fmt.Errorf("collected a non-gauge/counter/histogram/summary/untyped metric: %s", metric))
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}
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func labelPairsAsLabels(pairs []*dto.LabelPair) (labels prometheus.Labels) {
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labels = prometheus.Labels{}
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for _, pair := range pairs {
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if pair.Name == nil {
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continue
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}
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value := ""
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if pair.Value != nil {
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value = *pair.Value
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}
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labels[*pair.Name] = value
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}
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return
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}
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1
go.mod
1
go.mod
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@ -14,6 +14,7 @@ require (
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github.com/onsi/gomega v1.4.3 // indirect
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github.com/onsi/gomega v1.4.3 // indirect
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github.com/pmezard/go-difflib v1.0.0 // indirect
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github.com/pmezard/go-difflib v1.0.0 // indirect
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github.com/prometheus/client_golang v0.9.2
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github.com/prometheus/client_golang v0.9.2
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github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910
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github.com/prometheus/common v0.0.0-20181126121408-4724e9255275
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github.com/prometheus/common v0.0.0-20181126121408-4724e9255275
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github.com/sergi/go-diff v1.0.0 // indirect
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github.com/sergi/go-diff v1.0.0 // indirect
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github.com/sirupsen/logrus v1.0.3 // indirect
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github.com/sirupsen/logrus v1.0.3 // indirect
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@ -22,6 +22,7 @@ import (
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/statsd_exporter/pkg/mapper/fsm"
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"github.com/prometheus/statsd_exporter/pkg/mapper/fsm"
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yaml "gopkg.in/yaml.v2"
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yaml "gopkg.in/yaml.v2"
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"time"
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)
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)
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var (
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var (
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@ -39,7 +40,7 @@ type mapperConfigDefaults struct {
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Quantiles []metricObjective `yaml:"quantiles"`
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Quantiles []metricObjective `yaml:"quantiles"`
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MatchType MatchType `yaml:"match_type"`
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MatchType MatchType `yaml:"match_type"`
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GlobDisableOrdering bool `yaml:"glob_disable_ordering"`
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GlobDisableOrdering bool `yaml:"glob_disable_ordering"`
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Ttl uint64 `yaml:"ttl"`
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Ttl time.Duration `yaml:"ttl"`
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}
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}
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|
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type MetricMapper struct {
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type MetricMapper struct {
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@ -70,7 +71,7 @@ type MetricMapping struct {
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HelpText string `yaml:"help"`
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HelpText string `yaml:"help"`
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Action ActionType `yaml:"action"`
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Action ActionType `yaml:"action"`
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MatchMetricType MetricType `yaml:"match_metric_type"`
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MatchMetricType MetricType `yaml:"match_metric_type"`
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Ttl uint64 `yaml:"ttl"`
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Ttl time.Duration `yaml:"ttl"`
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}
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}
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|
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type metricObjective struct {
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type metricObjective struct {
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|
|
|
@ -15,6 +15,7 @@ package mapper
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|
|
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import (
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import (
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"testing"
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"testing"
|
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|
"time"
|
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)
|
)
|
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|
|
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type mappings map[string]struct {
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type mappings map[string]struct {
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@ -22,6 +23,7 @@ type mappings map[string]struct {
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labels map[string]string
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labels map[string]string
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quantiles []metricObjective
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quantiles []metricObjective
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notPresent bool
|
notPresent bool
|
||||||
|
ttl time.Duration
|
||||||
}
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}
|
||||||
|
|
||||||
func TestMetricMapperYAML(t *testing.T) {
|
func TestMetricMapperYAML(t *testing.T) {
|
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|
@ -603,6 +605,66 @@ mappings:
|
||||||
},
|
},
|
||||||
},
|
},
|
||||||
},
|
},
|
||||||
|
// Config that has a ttl.
|
||||||
|
{
|
||||||
|
config: `mappings:
|
||||||
|
- match: web.*
|
||||||
|
name: "web"
|
||||||
|
ttl: 10s
|
||||||
|
labels:
|
||||||
|
site: "$1"`,
|
||||||
|
mappings: mappings{
|
||||||
|
"test.a": {},
|
||||||
|
"web.localhost": {
|
||||||
|
name: "web",
|
||||||
|
labels: map[string]string{
|
||||||
|
"site": "localhost",
|
||||||
|
},
|
||||||
|
ttl: time.Second * 10,
|
||||||
|
},
|
||||||
|
},
|
||||||
|
},
|
||||||
|
// Config that has a default ttl.
|
||||||
|
{
|
||||||
|
config: `defaults:
|
||||||
|
ttl: 1m2s
|
||||||
|
mappings:
|
||||||
|
- match: web.*
|
||||||
|
name: "web"
|
||||||
|
labels:
|
||||||
|
site: "$1"`,
|
||||||
|
mappings: mappings{
|
||||||
|
"test.a": {},
|
||||||
|
"web.localhost": {
|
||||||
|
name: "web",
|
||||||
|
labels: map[string]string{
|
||||||
|
"site": "localhost",
|
||||||
|
},
|
||||||
|
ttl: time.Minute + time.Second*2,
|
||||||
|
},
|
||||||
|
},
|
||||||
|
},
|
||||||
|
// Config that override a default ttl.
|
||||||
|
{
|
||||||
|
config: `defaults:
|
||||||
|
ttl: 1m2s
|
||||||
|
mappings:
|
||||||
|
- match: web.*
|
||||||
|
name: "web"
|
||||||
|
ttl: 5s
|
||||||
|
labels:
|
||||||
|
site: "$1"`,
|
||||||
|
mappings: mappings{
|
||||||
|
"test.a": {},
|
||||||
|
"web.localhost": {
|
||||||
|
name: "web",
|
||||||
|
labels: map[string]string{
|
||||||
|
"site": "localhost",
|
||||||
|
},
|
||||||
|
ttl: time.Second * 5,
|
||||||
|
},
|
||||||
|
},
|
||||||
|
},
|
||||||
}
|
}
|
||||||
|
|
||||||
mapper := MetricMapper{}
|
mapper := MetricMapper{}
|
||||||
|
@ -633,6 +695,9 @@ mappings:
|
||||||
t.Fatalf("%d.%q: Expected labels %v, got %v", i, metric, mapping, labels)
|
t.Fatalf("%d.%q: Expected labels %v, got %v", i, metric, mapping, labels)
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
if mapping.ttl > 0 && mapping.ttl != m.Ttl {
|
||||||
|
t.Fatalf("%d.%q: Expected ttl of %s, got %s", i, metric, mapping.ttl.String(), m.Ttl.String())
|
||||||
|
}
|
||||||
|
|
||||||
if len(mapping.quantiles) != 0 {
|
if len(mapping.quantiles) != 0 {
|
||||||
if len(mapping.quantiles) != len(m.Quantiles) {
|
if len(mapping.quantiles) != len(m.Quantiles) {
|
||||||
|
|
Loading…
Reference in a new issue