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docs: update vmalert and vmagent docs (#6207)

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* restore and actualize doc section explaining duplicated labels error
* rm misleading comment about post-aggregation in stream aggregation
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Hui Wang 2024-04-30 16:27:06 +08:00 committed by GitHub
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3 changed files with 20 additions and 4 deletions
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2
app/vmalert/rule/rule.go
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@ -32,7 +32,7 @@ type Rule interface {
close()
}
var errDuplicate = errors.New("result contains metrics with the same labelset after applying rule labels. See https://docs.victoriametrics.com/vmalert/#series-with-the-same-labelset for details")
var errDuplicate = errors.New("result contains metrics with the same labelset during evaluation. See https://docs.victoriametrics.com/vmalert/#series-with-the-same-labelset for details")
type ruleState struct {
sync.RWMutex

3
docs/stream-aggregation.md
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@ -598,9 +598,6 @@ some_counter:5m_increase / 5m
This is similar to `rate(some_counter[5m])`.
Please note, opposite to [rate](https://docs.victoriametrics.com/metricsql/#rate), `increase` aggregations can be
combined safely afterwards. This is helpful when the aggregation is calculated by more than one vmagent.
Aggregating irregular and sporadic metrics (received from [Lambdas](https://aws.amazon.com/lambda/)
or [Cloud Functions](https://cloud.google.com/functions)) can be controlled via [staleness_interval](#staleness) option.

19
docs/vmalert.md
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@ -902,6 +902,25 @@ max(vmalert_alerting_rules_last_evaluation_series_fetched) by(group, alertname)
See more details [here](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4039).
This feature is available only if vmalert is using VictoriaMetrics v1.90 or higher as a datasource.
### Series with the same labelset
vmalert can produce the following error message:
```
result contains metrics with the same labelset during evaluation
```
The error means there is a collision between [time series](https://docs.victoriametrics.com/keyConcepts.html#time-series)
during evaluation.
For example, a rule with `expr: {__name__=~"vmalert_alerts_.*"} > 0` returns two distinct time series in response:
```
{__name__="vmalert_alerts_pending",job="vmalert",alertname="HostContextSwitching"} 12
{__name__="vmalert_alerts_firing",job="vmalert",alertname="HostContextSwitching"} 0
```
As label `__name__` will be dropped during evaluation, leads to duplicated time series.
To fix this, one could use function like [label_replace](https://docs.victoriametrics.com/metricsql/#label_replace) to preserve the distinct labelset.
## mTLS protection
By default `vmalert` accepts http requests at `8880` port (this port can be changed via `-httpListenAddr` command-line flags),