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lib/promscrape: show dropped targets because of sharding at /service-discovery page

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Previously the /service-discovery page didn't show targets dropped because of sharding
( https://docs.victoriametrics.com/vmagent.html#scraping-big-number-of-targets ).

Show also the reason why every target is dropped at /service-discovery page.
This should improve debuging why particular targets are dropped.

While at it, do not remove dropped targets from the list at /service-discovery page
until the total number of targets exceeds the limit passed to -promscrape.maxDroppedTargets .
Previously the list was cleaned up every 10 minutes from the entries, which weren't updated
for the last minute. This could complicate debugging of dropped targets.

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5389
This commit is contained in:
Aliaksandr Valialkin 2023-12-01 16:37:57 +02:00
parent e1359c904c
commit 487f6380d0
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GPG key ID: 52C003EE2BCDB9EB
6 changed files with 61 additions and 39 deletions
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1
docs/CHANGELOG.md
View file

@ -31,6 +31,7 @@ The sandbox cluster installation is running under the constant load generated by
* FEATURE: [vmagent](https://docs.victoriametrics.com/vmagent.html): add `-remoteWrite.disableOnDiskQueue` command-line flag, which can be used for disabling data queueing to disk when the remote storage cannot keep up with the data ingestion rate. See [these docs](https://docs.victoriametrics.com/vmagent.html#disabling-on-disk-persistence) and [this feature request](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2110).
* FEATURE: [vmagent](https://docs.victoriametrics.com/vmagent.html): add support for reading and writing samples via [Google PubSub](https://cloud.google.com/pubsub). See [these docs](https://docs.victoriametrics.com/vmagent.html#google-pubsub-integration).
* FEATURE: [vmagent](https://docs.victoriametrics.com/vmagent.html): add support for Datadog `/api/v2/series` and `/api/beta/sketches` ingestion protocols to vmagent/vminsert components. See this [doc](https://docs.victoriametrics.com/#how-to-send-data-from-datadog-agent) for examples. Thanks to @AndrewChubatiuk for the [pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/5094).
* FEATURE: [vmagent](https://docs.victoriametrics.com/vmagent.html): show all the dropped targets together with the reason why they are dropped at `http://vmagent:8429/service-discovery` page. Previously targets, which were dropped because of [target sharding](https://docs.victoriametrics.com/vmagent.html#scraping-big-number-of-targets) weren't displayed on this page. This could complicate service discovery debugging. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5389).
* FEATURE: reduce the default value for `-import.maxLineLen` command-line flag from 100MB to 10MB in order to prevent excessive memory usage during data import via [/api/v1/import](https://docs.victoriametrics.com/#how-to-import-data-in-json-line-format).
* FEATURE: [vmagent](https://docs.victoriametrics.com/vmagent.html): add `keep_if_contains` and `drop_if_contains` relabeling actions. See [these docs](https://docs.victoriametrics.com/vmagent.html#relabeling-enhancements) for details.
* FEATURE: [MetricsQL](https://docs.victoriametrics.com/MetricsQL.html): add [day_of_year()](https://docs.victoriametrics.com/MetricsQL.html#day_of_year) function, which returns the day of the year for each of the given unix timestamps. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5345) for details. Thanks to @luckyxiaoqiang for the [pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/5368/).

38
lib/promscrape/config.go
View file

@ -1049,14 +1049,18 @@ func (swc *scrapeWorkConfig) getScrapeWork(target string, extraLabels, metaLabel
defer promutils.PutLabels(labels)
mergeLabels(labels, swc, target, extraLabels, metaLabels)
var originalLabels *promutils.Labels
if !*dropOriginalLabels {
originalLabels = labels.Clone()
}
originalLabels := labels.Clone()
labels.Labels = swc.relabelConfigs.Apply(labels.Labels, 0)
// Remove labels starting from "__meta_" prefix according to https://www.robustperception.io/life-of-a-label/
labels.RemoveMetaLabels()
if labels.Len() == 0 {
// Drop target without labels.
originalLabels = sortOriginalLabelsIfNeeded(originalLabels)
droppedTargetsMap.Register(originalLabels, swc.relabelConfigs, targetDropReasonRelabeling)
return nil, nil
}
// Verify whether the scrape work must be skipped because of `-promscrape.cluster.*` configs.
// Perform the verification on labels after the relabeling in order to guarantee that targets with the same set of labels
// go to the same vmagent shard.
@ -1067,23 +1071,16 @@ func (swc *scrapeWorkConfig) getScrapeWork(target string, extraLabels, metaLabel
needSkip := needSkipScrapeWork(bytesutil.ToUnsafeString(bb.B), *clusterMembersCount, *clusterReplicationFactor, clusterMemberID)
scrapeWorkKeyBufPool.Put(bb)
if needSkip {
originalLabels = sortOriginalLabelsIfNeeded(originalLabels)
droppedTargetsMap.Register(originalLabels, swc.relabelConfigs, targetDropReasonSharding)
return nil, nil
}
}
if !*dropOriginalLabels {
originalLabels.Sort()
// Reduce memory usage by interning all the strings in originalLabels.
originalLabels.InternStrings()
}
if labels.Len() == 0 {
// Drop target without labels.
droppedTargetsMap.Register(originalLabels, swc.relabelConfigs)
return nil, nil
}
scrapeURL, address := promrelabel.GetScrapeURL(labels, swc.params)
if scrapeURL == "" {
// Drop target without URL.
droppedTargetsMap.Register(originalLabels, swc.relabelConfigs)
originalLabels = sortOriginalLabelsIfNeeded(originalLabels)
droppedTargetsMap.Register(originalLabels, swc.relabelConfigs, targetDropReasonMissingScrapeURL)
return nil, nil
}
if _, err := url.Parse(scrapeURL); err != nil {
@ -1155,6 +1152,7 @@ func (swc *scrapeWorkConfig) getScrapeWork(target string, extraLabels, metaLabel
// Reduce memory usage by interning all the strings in labels.
labelsCopy.InternStrings()
originalLabels = sortOriginalLabelsIfNeeded(originalLabels)
sw := &ScrapeWork{
ScrapeURL: scrapeURL,
ScrapeInterval: scrapeInterval,
@ -1185,6 +1183,16 @@ func (swc *scrapeWorkConfig) getScrapeWork(target string, extraLabels, metaLabel
return sw, nil
}
func sortOriginalLabelsIfNeeded(originalLabels *promutils.Labels) *promutils.Labels {
if *dropOriginalLabels {
return nil
}
originalLabels.Sort()
// Reduce memory usage by interning all the strings in originalLabels.
originalLabels.InternStrings()
return originalLabels
}
func mergeLabels(dst *promutils.Labels, swc *scrapeWorkConfig, target string, extraLabels, metaLabels *promutils.Labels) {
if n := dst.Len(); n > 0 {
logger.Panicf("BUG: len(dst.Labels) must be 0; got %d", n)

2
lib/promscrape/scraper.go
View file

@ -370,7 +370,7 @@ func (sg *scraperGroup) update(sws []*ScrapeWork) {
"original labels for target1: %s; original labels for target2: %s",
sw.ScrapeURL, sw.Labels.String(), originalLabels.String(), sw.OriginalLabels.String())
}
droppedTargetsMap.Register(sw.OriginalLabels, sw.RelabelConfigs)
droppedTargetsMap.Register(sw.OriginalLabels, sw.RelabelConfigs, targetDropReasonDuplicate)
continue
}
swsMap[key] = sw.OriginalLabels

39
lib/promscrape/targetstatus.go
View file

@ -13,7 +13,6 @@ import (
"time"
"unsafe"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/fasttime"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promrelabel"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promutils"
"github.com/cespare/xxhash/v2"
@ -250,15 +249,23 @@ func (ts *targetStatus) getDurationFromLastScrape() time.Duration {
type droppedTargets struct {
mu sync.Mutex
m map[uint64]droppedTarget
lastCleanupTime uint64
}
type droppedTarget struct {
originalLabels *promutils.Labels
relabelConfigs *promrelabel.ParsedConfigs
deadline uint64
dropReason targetDropReason
}
type targetDropReason string
const (
targetDropReasonRelabeling = targetDropReason("relabeling") // target dropped because of relabeling
targetDropReasonMissingScrapeURL = targetDropReason("missing scrape URL") // target dropped because of missing scrape URL
targetDropReasonDuplicate = targetDropReason("duplicate") // target with the given set of labels already exists
targetDropReasonSharding = targetDropReason("sharding") // target is dropped becase of sharding https://docs.victoriametrics.com/vmagent.html#scraping-big-number-of-targets
)
func (dt *droppedTargets) getTargetsList() []droppedTarget {
dt.mu.Lock()
dts := make([]droppedTarget, 0, len(dt.m))
@ -275,30 +282,30 @@ func (dt *droppedTargets) getTargetsList() []droppedTarget {
return dts
}
func (dt *droppedTargets) Register(originalLabels *promutils.Labels, relabelConfigs *promrelabel.ParsedConfigs) {
if *dropOriginalLabels {
// The originalLabels must be dropped, so do not register it.
// Register registers dropped target with the given originalLabels.
//
// The relabelConfigs must contain relabel configs, which were applied to originalLabels.
// The reason must contain the reason why the target has been dropped.
func (dt *droppedTargets) Register(originalLabels *promutils.Labels, relabelConfigs *promrelabel.ParsedConfigs, reason targetDropReason) {
if originalLabels == nil {
// Do not register target without originalLabels. This is the case when *dropOriginalLabels is set to true.
return
}
// It is better to have hash collisions instead of spending additional CPU on originalLabels.String() call.
key := labelsHash(originalLabels)
currentTime := fasttime.UnixTimestamp()
dt.mu.Lock()
_, ok := dt.m[key]
if ok || len(dt.m) < *maxDroppedTargets {
dt.m[key] = droppedTarget{
originalLabels: originalLabels,
relabelConfigs: relabelConfigs,
deadline: currentTime + 10*60,
dropReason: reason,
}
}
if currentTime-dt.lastCleanupTime > 60 {
for k, v := range dt.m {
if currentTime > v.deadline {
if len(dt.m) >= *maxDroppedTargets {
for k := range dt.m {
delete(dt.m, k)
if len(dt.m) < *maxDroppedTargets {
break
}
}
dt.lastCleanupTime = currentTime
}
dt.mu.Unlock()
}
@ -514,6 +521,7 @@ type targetLabels struct {
up bool
originalLabels *promutils.Labels
labels *promutils.Labels
dropReason targetDropReason
}
type targetLabelsByJob struct {
jobName string
@ -604,6 +612,7 @@ func (tsr *targetsStatusResult) getTargetLabelsByJob() []*targetLabelsByJob {
m.droppedTargets++
m.targets = append(m.targets, targetLabels{
originalLabels: dt.originalLabels,
dropReason: dt.dropReason,
})
}
a := make([]*targetLabelsByJob, 0, len(byJob))

2
lib/promscrape/targetstatus.qtpl
View file

@ -336,7 +336,7 @@
{% elseif t.labels.Len() > 0 %}
<span class="badge bg-danger">DOWN</span>
{% else %}
<span class="badge bg-warning">DROPPED</span>
<span class="badge bg-warning">DROPPED ({%s string(t.dropReason) %})</span>
{% endif %}
</td>
<td class="labels">

6
lib/promscrape/targetstatus.qtpl.go
View file

@ -875,7 +875,11 @@ func streamdiscoveredJobTargets(qw422016 *qt422016.Writer, num int, tlj *targetL
//line lib/promscrape/targetstatus.qtpl:338
} else {
//line lib/promscrape/targetstatus.qtpl:338
qw422016.N().S(`<span class="badge bg-warning">DROPPED</span>`)
qw422016.N().S(`<span class="badge bg-warning">DROPPED (`)
//line lib/promscrape/targetstatus.qtpl:339
qw422016.E().S(string(t.dropReason))
//line lib/promscrape/targetstatus.qtpl:339
qw422016.N().S(`)</span>`)
//line lib/promscrape/targetstatus.qtpl:340
}
//line lib/promscrape/targetstatus.qtpl:340