Alerts: more efficient relabel on Send
Re-use `labels.Builder` and use `relabel.ProcessBuilder` to skip a conversion step. Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
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@ -349,19 +349,6 @@ func (n *Manager) Send(alerts ...*Alert) {
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n.mtx.Lock()
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defer n.mtx.Unlock()
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// Attach external labels before relabelling and sending.
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for _, a := range alerts {
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lb := labels.NewBuilder(a.Labels)
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n.opts.ExternalLabels.Range(func(l labels.Label) {
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if a.Labels.Get(l.Name) == "" {
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lb.Set(l.Name, l.Value)
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}
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})
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a.Labels = lb.Labels()
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}
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alerts = n.relabelAlerts(alerts)
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if len(alerts) == 0 {
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return
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@ -390,15 +377,25 @@ func (n *Manager) Send(alerts ...*Alert) {
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n.setMore()
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}
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// Attach external labels and process relabelling rules.
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func (n *Manager) relabelAlerts(alerts []*Alert) []*Alert {
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lb := labels.NewBuilder(labels.EmptyLabels())
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var relabeledAlerts []*Alert
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for _, alert := range alerts {
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labels, keep := relabel.Process(alert.Labels, n.opts.RelabelConfigs...)
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if keep {
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alert.Labels = labels
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relabeledAlerts = append(relabeledAlerts, alert)
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for _, a := range alerts {
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lb.Reset(a.Labels)
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n.opts.ExternalLabels.Range(func(l labels.Label) {
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if a.Labels.Get(l.Name) == "" {
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lb.Set(l.Name, l.Value)
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}
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})
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keep := relabel.ProcessBuilder(lb, n.opts.RelabelConfigs...)
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if !keep {
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continue
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}
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a.Labels = lb.Labels()
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relabeledAlerts = append(relabeledAlerts, a)
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}
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return relabeledAlerts
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}
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