// ApplyConfig updates the status state as the new config requires.
func (n *Notifier) ApplyConfig(conf *config.Config) error {
n.mtx.Lock()
defer n.mtx.Unlock()
n.opts.ExternalLabels = conf.GlobalConfig.ExternalLabels
n.opts.RelabelConfigs = conf.AlertingConfig.AlertRelabelConfigs
amSets := []*alertmanagerSet{}
ctx, cancel := context.WithCancel(n.ctx)
for _, cfg := range conf.AlertingConfig.AlertmanagerConfigs {
ams, err := newAlertmanagerSet(cfg)
if err != nil {
return err
}
amSets = append(amSets, ams)
}
// After all sets were created successfully, start them and cancel the
// old ones.
for _, ams := range amSets {
go ams.ts.Run(ctx)
ams.ts.UpdateProviders(discovery.ProvidersFromConfig(ams.cfg.ServiceDiscoveryConfig))
}
if n.cancelDiscovery != nil {
n.cancelDiscovery()
}
n.cancelDiscovery = cancel
n.alertmanagers = amSets
return nil
}
func (tm *TargetManager) reload() {
jobs := map[string]struct{}{}
// Start new target sets and update existing ones.
for _, scfg := range tm.scrapeConfigs {
jobs[scfg.JobName] = struct{}{}
ts, ok := tm.targetSets[scfg.JobName]
if !ok {
ctx, cancel := context.WithCancel(tm.ctx)
ts = &targetSet{
ctx: ctx,
cancel: cancel,
sp: newScrapePool(ctx, scfg, tm.appender),
}
ts.ts = discovery.NewTargetSet(ts.sp)
tm.targetSets[scfg.JobName] = ts
tm.wg.Add(1)
go func(ts *targetSet) {
// Run target set, which blocks until its context is canceled.
// Gracefully shut down pending scrapes in the scrape pool afterwards.
ts.ts.Run(ctx)
ts.sp.stop()
tm.wg.Done()
}(ts)
} else {
ts.sp.reload(scfg)
}
ts.ts.UpdateProviders(discovery.ProvidersFromConfig(scfg.ServiceDiscoveryConfig))
}
// Remove old target sets. Waiting for scrape pools to complete pending
// scrape inserts is already guaranteed by the goroutine that started the target set.
for name, ts := range tm.targetSets {
if _, ok := jobs[name]; !ok {
ts.cancel()
delete(tm.targetSets, name)
}
}
}