mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-25 03:40:10 +01:00
227 lines
8.1 KiB
Go
227 lines
8.1 KiB
Go
package main
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import (
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"context"
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"flag"
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"fmt"
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"net/url"
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"os"
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"strconv"
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"strings"
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"time"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vmalert/config"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vmalert/datasource"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vmalert/notifier"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vmalert/remoteread"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vmalert/remotewrite"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/buildinfo"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/cgroup"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/envflag"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/fasttime"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/httpserver"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/procutil"
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"github.com/VictoriaMetrics/metrics"
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)
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var (
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rulePath = flagutil.NewArray("rule", `Path to the file with alert rules.
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Supports patterns. Flag can be specified multiple times.
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Examples:
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-rule="/path/to/file". Path to a single file with alerting rules
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-rule="dir/*.yaml" -rule="/*.yaml". Relative path to all .yaml files in "dir" folder,
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absolute path to all .yaml files in root.
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Rule files may contain %{ENV_VAR} placeholders, which are substituted by the corresponding env vars.`)
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httpListenAddr = flag.String("httpListenAddr", ":8880", "Address to listen for http connections")
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evaluationInterval = flag.Duration("evaluationInterval", time.Minute, "How often to evaluate the rules")
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validateTemplates = flag.Bool("rule.validateTemplates", true, "Whether to validate annotation and label templates")
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validateExpressions = flag.Bool("rule.validateExpressions", true, "Whether to validate rules expressions via MetricsQL engine")
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externalURL = flag.String("external.url", "", "External URL is used as alert's source for sent alerts to the notifier")
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externalAlertSource = flag.String("external.alert.source", "", `External Alert Source allows to override the Source link for alerts sent to AlertManager for cases where you want to build a custom link to Grafana, Prometheus or any other service.
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eg. 'explore?orgId=1&left=[\"now-1h\",\"now\",\"VictoriaMetrics\",{\"expr\": \"{{$expr|quotesEscape|pathEscape}}\"},{\"mode\":\"Metrics\"},{\"ui\":[true,true,true,\"none\"]}]'.If empty '/api/v1/:groupID/alertID/status' is used`)
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externalLabels = flagutil.NewArray("external.label", "Optional label in the form 'name=value' to add to all generated recording rules and alerts. "+
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"Pass multiple -label flags in order to add multiple label sets.")
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remoteReadLookBack = flag.Duration("remoteRead.lookback", time.Hour, "Lookback defines how far to look into past for alerts timeseries."+
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" For example, if lookback=1h then range from now() to now()-1h will be scanned.")
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dryRun = flag.Bool("dryRun", false, "Whether to check only config files without running vmalert. The rules file are validated. The `-rule` flag must be specified.")
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)
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func main() {
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// Write flags and help message to stdout, since it is easier to grep or pipe.
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flag.CommandLine.SetOutput(os.Stdout)
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flag.Usage = usage
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envflag.Parse()
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buildinfo.Init()
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logger.Init()
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cgroup.UpdateGOMAXPROCSToCPUQuota()
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if *dryRun {
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u, _ := url.Parse("https://victoriametrics.com/")
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notifier.InitTemplateFunc(u)
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groups, err := config.Parse(*rulePath, true, true)
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if err != nil {
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logger.Fatalf(err.Error())
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}
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if len(groups) == 0 {
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logger.Fatalf("No rules for validation. Please specify path to file(s) with alerting and/or recording rules using `-rule` flag")
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}
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return
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}
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ctx, cancel := context.WithCancel(context.Background())
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manager, err := newManager(ctx)
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if err != nil {
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logger.Fatalf("failed to init: %s", err)
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}
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if err := manager.start(ctx, *rulePath, *validateTemplates, *validateExpressions); err != nil {
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logger.Fatalf("failed to start: %s", err)
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}
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go func() {
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// init reload metrics with positive values to improve alerting conditions
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configSuccess.Set(1)
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configTimestamp.Set(fasttime.UnixTimestamp())
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sigHup := procutil.NewSighupChan()
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for {
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<-sigHup
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configReloads.Inc()
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logger.Infof("SIGHUP received. Going to reload rules %q ...", *rulePath)
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if err := manager.update(ctx, *rulePath, *validateTemplates, *validateExpressions, false); err != nil {
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configReloadErrors.Inc()
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configSuccess.Set(0)
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logger.Errorf("error while reloading rules: %s", err)
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continue
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}
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configSuccess.Set(1)
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configTimestamp.Set(fasttime.UnixTimestamp())
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logger.Infof("Rules reloaded successfully from %q", *rulePath)
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}
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}()
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rh := &requestHandler{m: manager}
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go httpserver.Serve(*httpListenAddr, rh.handler)
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sig := procutil.WaitForSigterm()
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logger.Infof("service received signal %s", sig)
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if err := httpserver.Stop(*httpListenAddr); err != nil {
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logger.Fatalf("cannot stop the webservice: %s", err)
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}
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cancel()
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manager.close()
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}
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var (
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configReloads = metrics.NewCounter(`vmalert_config_last_reload_total`)
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configReloadErrors = metrics.NewCounter(`vmalert_config_last_reload_errors_total`)
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configSuccess = metrics.NewCounter(`vmalert_config_last_reload_successful`)
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configTimestamp = metrics.NewCounter(`vmalert_config_last_reload_success_timestamp_seconds`)
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)
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func newManager(ctx context.Context) (*manager, error) {
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q, err := datasource.Init()
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if err != nil {
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return nil, fmt.Errorf("failed to init datasource: %w", err)
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}
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eu, err := getExternalURL(*externalURL, *httpListenAddr, httpserver.IsTLS())
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if err != nil {
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return nil, fmt.Errorf("failed to init `external.url`: %w", err)
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}
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notifier.InitTemplateFunc(eu)
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aug, err := getAlertURLGenerator(eu, *externalAlertSource, *validateTemplates)
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if err != nil {
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return nil, fmt.Errorf("failed to init `external.alert.source`: %w", err)
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}
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nts, err := notifier.Init(aug)
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if err != nil {
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return nil, fmt.Errorf("failed to init notifier: %w", err)
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}
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manager := &manager{
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groups: make(map[uint64]*Group),
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querier: q,
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notifiers: nts,
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labels: map[string]string{},
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}
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rw, err := remotewrite.Init(ctx)
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if err != nil {
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return nil, fmt.Errorf("failed to init remoteWrite: %w", err)
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}
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manager.rw = rw
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rr, err := remoteread.Init()
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if err != nil {
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return nil, fmt.Errorf("failed to init remoteRead: %w", err)
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}
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manager.rr = rr
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for _, s := range *externalLabels {
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n := strings.IndexByte(s, '=')
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if n < 0 {
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return nil, fmt.Errorf("missing '=' in `-label`. It must contain label in the form `name=value`; got %q", s)
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}
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manager.labels[s[:n]] = s[n+1:]
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}
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return manager, nil
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}
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func getExternalURL(externalURL, httpListenAddr string, isSecure bool) (*url.URL, error) {
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if externalURL != "" {
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return url.Parse(externalURL)
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}
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hname, err := os.Hostname()
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if err != nil {
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return nil, err
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}
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port := ""
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if ipport := strings.Split(httpListenAddr, ":"); len(ipport) > 1 {
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port = ":" + ipport[1]
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}
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schema := "http://"
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if isSecure {
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schema = "https://"
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}
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return url.Parse(fmt.Sprintf("%s%s%s", schema, hname, port))
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}
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func getAlertURLGenerator(externalURL *url.URL, externalAlertSource string, validateTemplate bool) (notifier.AlertURLGenerator, error) {
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if externalAlertSource == "" {
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return func(alert notifier.Alert) string {
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return fmt.Sprintf("%s/api/v1/%s/%s/status", externalURL, strconv.FormatUint(alert.GroupID, 10), strconv.FormatUint(alert.ID, 10))
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}, nil
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}
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if validateTemplate {
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if err := notifier.ValidateTemplates(map[string]string{
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"tpl": externalAlertSource,
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}); err != nil {
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return nil, fmt.Errorf("error validating source template %s: %w", externalAlertSource, err)
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}
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}
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m := map[string]string{
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"tpl": externalAlertSource,
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}
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return func(alert notifier.Alert) string {
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templated, err := alert.ExecTemplate(m)
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if err != nil {
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logger.Errorf("can not exec source template %s", err)
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}
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return fmt.Sprintf("%s/%s", externalURL, templated["tpl"])
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}, nil
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}
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func usage() {
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const s = `
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vmalert processes alerts and recording rules.
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See the docs at https://github.com/VictoriaMetrics/VictoriaMetrics/blob/master/app/vmalert/README.md .
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`
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f := flag.CommandLine.Output()
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fmt.Fprintf(f, "%s\n", s)
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flag.PrintDefaults()
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}
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