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https://github.com/VictoriaMetrics/VictoriaMetrics.git
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4edb97f4da
app/vmalert: detect alerting rules which don't match any series at all
vmalert starts to understand /query responses which contain object:
```
"stats":{"seriesFetched": "42"}
```
If object is present, vmalert parses it and populates a new field
`SeriesFetched`. This field is then used to populate the new metric
`vmalert_alerting_rules_last_evaluation_series_fetched` and to
display warnings in the vmalert's UI.
If response doesn't contain the new object (Prometheus or
VictoriaMetrics earlier than v1.90), then `SeriesFetched=nil`.
In this case, UI will contain no additional warnings.
And `vmalert_alerting_rules_last_evaluation_series_fetched` will
be set to `-1`. Negative value of the metric will help to compile
correct alerting rule in follow-up.
Thanks for the initial implementation to @Haleygo
See https://github.com/VictoriaMetrics/VictoriaMetrics/pull/4056
See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4039
Signed-off-by: hagen1778 <roman@victoriametrics.com>
111 lines
2.9 KiB
Go
111 lines
2.9 KiB
Go
package datasource
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import (
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"context"
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"net/http"
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"net/url"
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"time"
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)
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// Querier interface wraps Query and QueryRange methods
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type Querier interface {
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// Query executes instant request with the given query at the given ts.
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// It returns list of Metric in response, the http.Request used for sending query
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// and error if any. Returned http.Request can't be reused and its body is already read.
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// Query should stop once ctx is cancelled.
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Query(ctx context.Context, query string, ts time.Time) (Result, *http.Request, error)
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// QueryRange executes range request with the given query on the given time range.
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// It returns list of Metric in response and error if any.
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// QueryRange should stop once ctx is cancelled.
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QueryRange(ctx context.Context, query string, from, to time.Time) (Result, error)
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}
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// Result represents expected response from the datasource
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type Result struct {
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// Data contains list of received Metric
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Data []Metric
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// SeriesFetched contains amount of time series processed by datasource
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// during query evaluation.
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// If nil, then this feature is not supported by the datasource.
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// SeriesFetched is supported by VictoriaMetrics since v1.90.
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SeriesFetched *int
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}
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// QuerierBuilder builds Querier with given params.
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type QuerierBuilder interface {
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// BuildWithParams creates a new Querier object with the given params
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BuildWithParams(params QuerierParams) Querier
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}
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// QuerierParams params for Querier.
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type QuerierParams struct {
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DataSourceType string
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EvaluationInterval time.Duration
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QueryParams url.Values
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Headers map[string]string
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Debug bool
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}
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// Metric is the basic entity which should be return by datasource
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type Metric struct {
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Labels []Label
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Timestamps []int64
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Values []float64
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}
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// SetLabel adds or updates existing one label
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// by the given key and label
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func (m *Metric) SetLabel(key, value string) {
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for i, l := range m.Labels {
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if l.Name == key {
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m.Labels[i].Value = value
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return
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}
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}
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m.AddLabel(key, value)
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}
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// SetLabels sets the given map as Metric labels
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func (m *Metric) SetLabels(ls map[string]string) {
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var i int
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m.Labels = make([]Label, len(ls))
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for k, v := range ls {
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m.Labels[i] = Label{
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Name: k,
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Value: v,
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}
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i++
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}
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}
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// AddLabel appends the given label to the label set
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func (m *Metric) AddLabel(key, value string) {
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m.Labels = append(m.Labels, Label{Name: key, Value: value})
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}
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// DelLabel deletes the given label from the label set
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func (m *Metric) DelLabel(key string) {
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for i, l := range m.Labels {
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if l.Name == key {
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m.Labels = append(m.Labels[:i], m.Labels[i+1:]...)
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}
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}
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}
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// Label returns the given label value.
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// If label is missing empty string will be returned
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func (m *Metric) Label(key string) string {
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for _, l := range m.Labels {
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if l.Name == key {
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return l.Value
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}
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}
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return ""
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}
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// Label represents metric's label
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type Label struct {
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Name string
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Value string
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}
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