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The commit adds a support for template function `query`, `first` and `value`. The function `query` executes a MetricsQL query for active alerts. In vmalert we update templates on every evaluation for active alerts to keep them up to date. With `query` func it may become a perf issue since it will fire a query on every execution. We should keep it in mind for now. https://github.com/VictoriaMetrics/VictoriaMetrics/issues/539
52 lines
1.1 KiB
Go
52 lines
1.1 KiB
Go
package datasource
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import "context"
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// Querier interface wraps Query method which
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// executes given query and returns list of Metrics
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// as result
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type Querier interface {
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Query(ctx context.Context, query string) ([]Metric, error)
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}
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// Metric is the basic entity which should be return by datasource
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// It represents single data point with full list of labels
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type Metric struct {
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Labels []Label
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Timestamp int64
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Value 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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// 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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// 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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