mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-11-21 14:44:00 +00:00
372 lines
13 KiB
Go
372 lines
13 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/app/vmalert/templates"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/buildinfo"
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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/VictoriaMetrics/lib/pushmetrics"
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"github.com/VictoriaMetrics/metrics"
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)
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var (
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rulePath = flagutil.NewArrayString("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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ruleTemplatesPath = flagutil.NewArrayString("rule.templates", `Path or glob pattern to location with go template definitions
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for rules annotations templating. Flag can be specified multiple times.
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Examples:
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-rule.templates="/path/to/file". Path to a single file with go templates
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-rule.templates="dir/*.tpl" -rule.templates="/*.tpl". Relative path to all .tpl files in "dir" folder,
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absolute path to all .tpl files in root.`)
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rulesCheckInterval = flag.Duration("rule.configCheckInterval", 0, "Interval for checking for changes in '-rule' files. "+
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"By default the checking is disabled. Send SIGHUP signal in order to force config check for changes. DEPRECATED - see '-configCheckInterval' instead")
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configCheckInterval = flag.Duration("configCheckInterval", 0, "Interval for checking for changes in '-rule' or '-notifier.config' files. "+
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"By default the checking is disabled. Send SIGHUP signal in order to force config check for changes.")
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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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maxResolveDuration = flag.Duration("rule.maxResolveDuration", 0, "Limits the maximum duration for automatic alert expiration, "+
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"which is by default equal to 3 evaluation intervals of the parent group.")
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resendDelay = flag.Duration("rule.resendDelay", 0, "Minimum amount of time to wait before resending an alert to notifier")
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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 `+
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`for cases where you want to build a custom link to Grafana, Prometheus or any other service. `+
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`Supports templating - see https://docs.victoriametrics.com/vmalert.html#templating . `+
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`For example, link to Grafana: -external.alert.source='explore?orgId=1&left=[\"now-1h\",\"now\",\"VictoriaMetrics\",{\"expr\": \"{{$expr|quotesEscape|crlfEscape|queryEscape}}\"},{\"mode\":\"Metrics\"},{\"ui\":[true,true,true,\"none\"]}]' . `+
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`If empty 'vmalert/alert?group_id={{.GroupID}}&alert_id={{.AlertID}}' is used. All query params will be automatically escaped`)
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externalLabels = flagutil.NewArrayString("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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remoteReadIgnoreRestoreErrors = flag.Bool("remoteRead.ignoreRestoreErrors", true, "Whether to ignore errors from remote storage when restoring alerts state on startup.")
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disableAlertGroupLabel = flag.Bool("disableAlertgroupLabel", false, "Whether to disable adding group's Name as label to generated alerts and time series.")
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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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var alertURLGeneratorFn notifier.AlertURLGenerator
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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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remoteread.InitSecretFlags()
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remotewrite.InitSecretFlags()
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datasource.InitSecretFlags()
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buildinfo.Init()
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logger.Init()
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pushmetrics.Init()
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err := templates.Load(*ruleTemplatesPath, true)
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if err != nil {
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logger.Fatalf("failed to parse %q: %s", *ruleTemplatesPath, err)
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}
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if *dryRun {
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groups, err := config.Parse(*rulePath, notifier.ValidateTemplates, true)
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if err != nil {
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logger.Fatalf("failed to parse %q: %s", *rulePath, err)
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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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eu, err := getExternalURL(*externalURL, *httpListenAddr, httpserver.IsTLS())
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if err != nil {
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logger.Fatalf("failed to init `external.url`: %s", err)
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}
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alertURLGeneratorFn, err = getAlertURLGenerator(eu, *externalAlertSource, *validateTemplates)
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if err != nil {
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logger.Fatalf("failed to init `external.alert.source`: %s", err)
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}
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var validateTplFn config.ValidateTplFn
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if *validateTemplates {
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validateTplFn = notifier.ValidateTemplates
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}
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if *replayFrom != "" || *replayTo != "" {
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rw, err := remotewrite.Init(context.Background())
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if err != nil {
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logger.Fatalf("failed to init remoteWrite: %s", err)
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}
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if rw == nil {
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logger.Fatalf("remoteWrite.url can't be empty in replay mode")
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}
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groupsCfg, err := config.Parse(*rulePath, validateTplFn, *validateExpressions)
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if err != nil {
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logger.Fatalf("cannot parse configuration file: %s", err)
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}
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// prevent queries from caching and boundaries aligning
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// when querying VictoriaMetrics datasource.
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q, err := datasource.Init(url.Values{"nocache": {"1"}})
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if err != nil {
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logger.Fatalf("failed to init datasource: %s", err)
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}
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if err := replay(groupsCfg, q, rw); err != nil {
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logger.Fatalf("replay failed: %s", err)
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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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logger.Infof("reading rules configuration file from %q", strings.Join(*rulePath, ";"))
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groupsCfg, err := config.Parse(*rulePath, validateTplFn, *validateExpressions)
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if err != nil {
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logger.Fatalf("cannot parse configuration file: %s", err)
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}
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// Register SIGHUP handler for config re-read just before manager.start call.
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// This guarantees that the config will be re-read if the signal arrives during manager.start call.
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// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1240
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sighupCh := procutil.NewSighupChan()
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if err := manager.start(ctx, groupsCfg); err != nil {
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logger.Fatalf("failed to start: %s", err)
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}
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go configReload(ctx, manager, groupsCfg, sighupCh)
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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(nil)
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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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labels := make(map[string]string)
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for _, s := range *externalLabels {
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if len(s) == 0 {
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continue
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}
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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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labels[s[:n]] = s[n+1:]
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}
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nts, err := notifier.Init(alertURLGeneratorFn, labels, *externalURL)
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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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querierBuilder: q,
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notifiers: nts,
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labels: labels,
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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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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(a notifier.Alert) string {
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gID, aID := strconv.FormatUint(a.GroupID, 10), strconv.FormatUint(a.ID, 10)
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return fmt.Sprintf("%s/vmalert/alert?%s=%s&%s=%s", externalURL, paramGroupID, gID, paramAlertID, aID)
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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(nil, alert.Labels, 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, url.QueryEscape(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://docs.victoriametrics.com/vmalert.html .
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`
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flagutil.Usage(s)
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}
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func configReload(ctx context.Context, m *manager, groupsCfg []config.Group, sighupCh <-chan os.Signal) {
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var configCheckCh <-chan time.Time
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checkInterval := *configCheckInterval
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if checkInterval == 0 && *rulesCheckInterval > 0 {
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logger.Warnf("flag `rule.configCheckInterval` is deprecated - use `configCheckInterval` instead")
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checkInterval = *rulesCheckInterval
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}
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if checkInterval > 0 {
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ticker := time.NewTicker(checkInterval)
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configCheckCh = ticker.C
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defer ticker.Stop()
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}
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var validateTplFn config.ValidateTplFn
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if *validateTemplates {
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validateTplFn = notifier.ValidateTemplates
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}
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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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for {
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select {
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case <-ctx.Done():
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return
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case <-sighupCh:
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tmplMsg := ""
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if len(*ruleTemplatesPath) > 0 {
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tmplMsg = fmt.Sprintf("and templates %q ", *ruleTemplatesPath)
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}
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logger.Infof("SIGHUP received. Going to reload rules %q %s...", *rulePath, tmplMsg)
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configReloads.Inc()
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case <-configCheckCh:
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}
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if err := notifier.Reload(); err != nil {
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configReloadErrors.Inc()
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configSuccess.Set(0)
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logger.Errorf("failed to reload notifier config: %s", err)
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continue
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}
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err := templates.Load(*ruleTemplatesPath, false)
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if err != nil {
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configReloadErrors.Inc()
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configSuccess.Set(0)
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logger.Errorf("failed to load new templates: %s", err)
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continue
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}
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newGroupsCfg, err := config.Parse(*rulePath, validateTplFn, *validateExpressions)
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if err != nil {
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configReloadErrors.Inc()
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configSuccess.Set(0)
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logger.Errorf("cannot parse configuration file: %s", err)
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continue
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}
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if configsEqual(newGroupsCfg, groupsCfg) {
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templates.Reload()
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// set success to 1 since previous reload
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// could have been unsuccessful
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configSuccess.Set(1)
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// config didn't change - skip it
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continue
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}
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if err := m.update(ctx, newGroupsCfg, 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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templates.Reload()
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groupsCfg = newGroupsCfg
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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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func configsEqual(a, b []config.Group) bool {
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if len(a) != len(b) {
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return false
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}
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for i := range a {
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if a[i].Checksum != b[i].Checksum {
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return false
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}
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}
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return true
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}
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